Preface

In developing the optical design of the Micro-shutter infrared testbed
three-lens collimator we geared our specifications toward commonly
available test plates by United States manufactures of Infrared lenses.
We found that the sets of test plates fall into two groups as described
in tables A3 and B3. Therefore, our design specification is duplicated
for the two groups of test plates available. The design is described as
\[Micro-shutter IR testbed design\] *A* and \[Micro-shutter IR testbed
design *B.* Manufacture of the three lens system using either design A
or design B will be functionally equivalent. Quotation need to be based
on only one design type. If other test plate groups are identified
additional designs can be considered.

Micro-Shutter IR Testbed Collimator Design A

![](media/image1.wmf){width="6.125in" height="1.2416666666666667in"}

A1.
Introduction............................................................................................................2

A1.1 General
Description................................................................................................
2

A1.2
Environment.........................................................................................................
2

A1.3 Scope of
Work......................................................................................................
2

A2. Number of Lens
Systems............................................................................................
3

A3. Optical
Coatings......................................................................................................3

A4. Lens
Covers...........................................................................................................
3

A5. Tolerance
Data........................................................................................................
3

A5.1 General
Tolerances.................................................................................................
3

A5.1.2 Surface
Tolerances.............................................................................................\...
4

> 5.1.2.1 Surface
> Tolerances.........\....................................................................4\
> 5.1.2.2 Surface Wedge
> Tolerances......\.............................................................4
>
> 5.1.2.3 Index
> Tolerances..............................................................................4
>
> 5.1.2.4 Element
> Tolerances...........................................................................4

A6. Prescription
Data......................................................................................................5

A6.1 Surface and Element
Data...........................................................................................5

6.1.1 Surface
Data....................................................................................\...5

6.1.2 Element
Data......................................................................................5

A6.2 Index of Refraction
Data............................................................................................5

A6.3 Thermal Coefficient of Expansion
Data...........................................................................5

A7. Element
Drawings...................................................................................................\...6

A7.1 ZnSe
Lens..............................................................................................................6

A7.2 BaF~2~
Lens..............................................................................................................7

A7.3 LiF
Lens...............................................................................................................8

A8. Performance
Requirements...........................................................................................8

Tables:

Table A1. General Testbed Collimator Lens
Data.............................................\........................\....3

Table A2. Tolerance Data
Summary........................................................................................3

Table A3. Surface
Tolerances................................................................................................4

Table A4. Wedge
Tolerances.................................................................................................4

Table A5. Glass
Tolerances..................................................................................................4

Table A6. Element
Tolerances........................................................................................\...\.....4

Table A7. Surface
Data.......................................................................................................5

Table A8. Element Data

Table A9. Index
Data.........................................................................................................5

Table A10. TCE
Data.........................................................................................................5

Figures:

Figure A1. IR Testbed
Collimator......\......\.................................................................................2

Figure A2. ZnSe
Lens............................\..............................................................................6

Figure A3. BaF~2~
Lens...............................\...........................................................................7

Figure A4. LiF
Lens\....................................\.........................................................................8

**A1. Introduction**

**A1.1 General Introduction**

This optical system will be used in an infrared testbed designed to test
the optical performance micro-shutter (micro electro-mechanical) MEMs
devices. The three lens collimator is used to take collimated light and
create a diffraction limited point source at the micro-shutter device.
After light passes through the shutter, a replica of the previous three
lens collimator is used to re-collimate the light. The system was
designed to create an f/15 testbed with a full field of view of 0.250^0^
at the micro-shutter array. The collimator is designed using Zemax to
work at wavelengths from 633nm to 5um with no anti-reflection coatings.
Although the lens assembly will be mounted in a barrel by the lens
manufacturer, a flange is not required on the mount.

**A1.2 Environment**

This optical system will operate in a lab environment. As such, its
design and manufacture shall incorporate appropriate safeguards to
ensure that all performance goals and system stability are satisfied
within this environment. The lens barrel mounting system shall maintain
proper alignment of the optics over the specified survivability
temperature range and handling of the system in a lab environment.

**A1.3 Scope of Work**

Figure A1 illustrates the lens layout of the collimator. Note that two
of these lens assemblies will be required. One system will be used to
create a point source from collimated light, the other will be used to
create collimated light from a point source. The scope of work described
in this document includes (1) the lens manufacture requirements, (2) the
mounting system design, and (3) performance testing for the completed
assembly. The scope of this work does not include incorporating the
optical assembly into the infrared testbed set-up.

![](media/image2.wmf){width="3.802755905511811in"
height="3.8751968503937007in"}Although this lens system was designed to
perform from 632.8nm to 5 microns, for the purposes of this document all
wavelength related tolerance data and the prescription data is given
with respect to the test wavelength of 632.8nm. Also, the dewar windows,
which were modeled in the development of these lenses, have been removed
for the purposes of this document.

Figure A1. IR Testbed Collimator Overview

The lens manufacture, tolerance and mounting system shall conform to the
specifications given in Tables A2 -- A10. Zemax prescription data is
available to aid in the lens mounting and design layout. General lens
data are listed in Table A1.

## Table A1. General Testbed Collimator Lens Data

  -------------------------------------------- --------------------------
  Surfaces                                     6

  System Aperture (Entrance Pupil Diameter)    *56.26mm*

  Glass Catalog                                Infrared

  Design Temperature                           20ºC

  Design Pressure                              1 *atm*

  Operating Temperature                        20ºC ![](media/image3.wmf)
                                               4ºC

  Effective Focal Length                       706.181

  Back Focal Length                            621.212*mm*

  Total Track                                  669.852*mm*

  Working F/#                                  13.9

  Image Space N.A.                             0.0359

  Stop Diameter                                *56.90mm*

  Design Wavelengths                           0.633, 1, 2, & 5 microns

  Test Wavelength                              632.8 *nm*
  -------------------------------------------- --------------------------

**A2. Number of Lens Systems**

Two lens systems will be manufactured as per the requirements set forth
in this document.

**A3. Optical Coatings**

The lens elements shall **[not]{.underline}** be treated with an
anti-reflection optical coatings.

**A4. Lens Covers**

The lens assembly shall be equipped with lens covers only if this does
not add additional cost to the lens assembly.

**A5. Tolerance Data**

**A5.1 General Tolerances**

The lens manufacture, alignment, and mounting shall conform to the
following general tolerances. Tolerances for specific lenses will be
defined later in this document.

## Table A2. Tolerance Data Summary

  ---------------------------------- ------------------------------------
  Surface Figure                     0.1 Waves PV @ 632.8nm

  Surface Quality                    60/40 Scratch Dig

  Surface Roughness                  15-20 **Å** RMS

  Material Index                     +/-0.001

  Abbe Number                        +/-0.5
  ---------------------------------- ------------------------------------

*A5.1.2 Surface Tolerances*

Each radius has been fitted to test plate indicated. The power tolerance
is the percent deviation of the radius of curvature from the nominal
value. Irregularity is in double pass fringes at 2 microns.

***A5.1.2.1 Surface Tolerances***

#### Table A3. Surface Tolerances

+-------+----------+-----------+-------+------------+----------------+
| **S   | **       | **Test**  | **Rad | **T        | **Thickness    |
| urf** | Radius** |           | ius** | hickness** | Tol** (*mm*)   |
|       |          | **Plate   |       |            |                |
|       | (*mm*)   | \#**      | **    | (*mm*)     |                |
|       |          |           | Tol** |            |                |
+-------+----------+-----------+-------+------------+----------------+
| 1     | 107.2134 | 4.2210    | 0.05% | 17.03      | +/-0.1         |
+-------+----------+-----------+-------+------------+----------------+
| 2     | 90.805   | 3.5750    | 0.05% | 10.61      | +/-0.1         |
+-------+----------+-----------+-------+------------+----------------+
| 3     | 115.8189 | 4.5598    | 0.1%  | 8.0        | +/-0.1         |
+-------+----------+-----------+-------+------------+----------------+
| 4     | 605.028  | 23.8200   | 0.1%  | 5.0        | +/-0.1         |
+-------+----------+-----------+-------+------------+----------------+
| 5     | -        | 55.6100   | 0.1%  | 8.0        | +/-0.5         |
|       | 1412.494 |           |       |            |                |
+-------+----------+-----------+-------+------------+----------------+
| 6     | 863.6    | 34.0000   | 0.1%  | \--        | \--            |
+-------+----------+-----------+-------+------------+----------------+

### A5.1.2.2 Surface Wedge Tolerances

#### Table A4. Wedge Tolerances

+-----------------+--------------------------+-------------------------+
| Surf            | Surface Tilt *X*         | Surface Tilt *Y*        |
|                 |                          |                         |
|                 | *(mm)*                   | *(mm)*                  |
+-----------------+--------------------------+-------------------------+
| 1               | **0.005**                | **0.005**               |
+-----------------+--------------------------+-------------------------+
| 2               | **0.005**                | **0.005**               |
+-----------------+--------------------------+-------------------------+
| 3               | 0.015                    | 0.015                   |
+-----------------+--------------------------+-------------------------+
| 4               | 0.015                    | 0.015                   |
+-----------------+--------------------------+-------------------------+
| 5               | 0.015                    | 0.015                   |
+-----------------+--------------------------+-------------------------+
| 6               | 0.015                    | 0.015                   |
+-----------------+--------------------------+-------------------------+

### A5.1.2.3 Index Tolerances

Table A5. Glass Tolerances

  ------------------------- ---------------------- -----------------------
  **Glass**                 **Index Tol**          **Abbe Tol**

  ZnSe                      0.001                  0.5

  BaF~2~                    0.001                  0.5

  LiF                       0.001                  0.5
  ------------------------- ---------------------- -----------------------

### A5.1.2.4 Element Tolerances

Table A6. Element Tolerances

+----------+----+-----+------------+------------+---------+----------+
| *        | ** | **  | *          | *          | **Tilt  | **Tilt   |
| *Element | Sr | Srf | *De-center | *De-center | X**     | Y**      |
| \#**     | f1 | 2** | X**        | Y**        |         |          |
|          | ** |     |            |            | (*de    | (*d      |
|          |    |     | (*mm*)     | (*mm*)     | grees*) | egrees*) |
+----------+----+-----+------------+------------+---------+----------+
| 1        | 1  | 2   | 0.15       | 0.15       | 0.08    | 0.08     |
+----------+----+-----+------------+------------+---------+----------+
| 2        | 3  | 4   | 0.15       | 0.15       | 0.08    | 0.08     |
+----------+----+-----+------------+------------+---------+----------+
| 3        | 5  | 6   | 0.15       | 0.15       | 0.08    | 0.08     |
+----------+----+-----+------------+------------+---------+----------+

# A6. Prescription Data

Manufacture & testing assumed at STP (20ºC and 1 *atm*)

### A6.1 Surface and Element Data

*A6.1.1 Surface Data*

Table A7. Surface Data

+-----+-------+---------+---------+------+-------------+------------+
| **  | **Rad | **Thic  | **Th    | *    | **Clear     | **Conic**  |
| Sur | ius** | kness** | ickness | *Gla | Aperature** |            |
| f** |       |         | Label** | ss** |             |            |
|     | (     | (*mm*)  |         |      | (*mm*)      |            |
|     | *mm*) |         |         |      |             |            |
+-----+-------+---------+---------+------+-------------+------------+
| 1   | 107   | 17.03   | t~1~    | ZnSe | 56.26       |            |
|     | .2134 |         |         |      |             |            |
+-----+-------+---------+---------+------+-------------+------------+
| 2   | 9     | 10.61   | t~2~    |      | 50.82       |            |
|     | 0.805 |         |         |      |             |            |
+-----+-------+---------+---------+------+-------------+------------+
| 3   | 115   | 8.0     | t~3~    | Ba   | 51.42       |            |
|     | .8189 |         |         | F~2~ |             |            |
+-----+-------+---------+---------+------+-------------+------------+
| 4   | 60    | 5.0     | t~4~    |      | 50.86       |            |
|     | 5.028 |         |         |      |             |            |
+-----+-------+---------+---------+------+-------------+------------+
| 5   | -141  | 8.0     | t~5~    | LiF  | 50.41       |            |
|     | 2.494 |         |         |      |             |            |
+-----+-------+---------+---------+------+-------------+------------+
| 6   | 863.6 | \--     |         |      | 49.80       |            |
+-----+-------+---------+---------+------+-------------+------------+
| IMA | Inf   |         |         |      |             |            |
|     | inity |         |         |      |             |            |
+-----+-------+---------+---------+------+-------------+------------+

*A6.1.2 Element Data*

Table A8. Element Data

+-----------+-----+-----+-------------------+-------------------------+
| **Element | **  | **  | **Lens Diameter** | **Edge Thickness**      |
| \#**      | Srf | Srf |                   |                         |
|           | 1** | 2** | **(mm)**          | **(mm)**                |
+-----------+-----+-----+-------------------+-------------------------+
| 1         | 1   | 2   | 63.50             | 17.82                   |
+-----------+-----+-----+-------------------+-------------------------+
| 2         | 3   | 4   | 57.15             | 5.27                    |
+-----------+-----+-----+-------------------+-------------------------+
| 3         | 5   | 6   | 57.15             | 8.72                    |
+-----------+-----+-----+-------------------+-------------------------+

### A6.2 Index of Refraction Data

Table A9. Index Data

  -------------- -------- -------------------- -----------------------------------------
  **Glass**      **Temp   **Pressure (*atm*)** **Index
                 (ºC)**                        for**![](media/image4.wmf)**(632.8nm)**

  ZnSe           20.00    1.00                 2.5906

  BaF~2~         20.00    1.00                 1.4732

  LiF            20.00    1.00                 1.3913
  -------------- -------- -------------------- -----------------------------------------

### A6.3 Thermal Coefficient of Expansion Data

Table A10. TCE Data

  ---------------------------------- ------------------------------------
  **Glass**                          **TCE (**![](media/image5.wmf)**)**

  ZnSe                               7.1

  BaF~2~                             18.4

  LiF                                34.4
  ---------------------------------- ------------------------------------

A**7. Element Drawings**

A7.1 ZnSe Lens

![](media/image6.wmf){width="7.4in" height="5.55in"}

Figure A2. ZnSe Lens

A7.2 BaF~2~ Lens

![](media/image7.wmf){width="7.4in" height="5.55in"}

Figure A2. BaF~2~ Lens

A7.3 LiF Lens

![](media/image8.wmf){width="7.4in" height="5.55in"}

Figure A4. Element #3

**A8. Performance Requirements**

Each lens system should be tested to make sure that in **single-pass**
its wavefront error does not exceed 0.30 waves rms.

Micro-Shutter IR Testbed Collimator Design B

![](media/image1.wmf){width="6.125in" height="1.2416666666666667in"}

B1.
Introduction...........................................................................................................10

B1.1 General
Description..............................................................................................\...10

B1.2
Environment...................................................................................................\......10

B1.3 Scope of
Work................................................................................................\.......10

B2. Number of Lens
Systems............................................................................................11

B3. Optical
Coatings......................................................................................................11

B4. Lens
Covers............................................................................................................11

B5. Tolerance
Data.........................................................................................................11

B5.1 General
Tolerances..................................................................................................11

B5.1.2 Surface
Tolerances................................................................................................12

> B5.1.2.1 Surface
> Tolerances.........\..................................................................12\
> B5.1.2.2 Surface Wedge
> Tolerances......\............................................................12
>
> B5.1.2.3 Index
> Tolerances.....................................................................\.........12
>
> B5.1.2.4 Element
> Tolerances...........................................................................12

B6. Prescription
Data.......................................................................................................13

B6.1 Surface and Element
Data...................................................................................\..........13

B6.1.1 Surface
Data......................................................................................13

B6.1.2 Element
Data.....................................................................................13

B6.2 Index of Refraction
Data..............................................................................................13

B6.3 Thermal Coefficient of Expansion
Data............................................................................13

B7. Element
Drawings......................................................................................................13

B7.1 ZnSe
Lens...............................................................................................................13

B7.2 BaF~2~
Lens................................................................................................................14

B7.3 LiF
Lens.................................................................................................................16

B8. Performance
Requirements....................................................................................\.........16

Tables:

Table B1. General Testbed Collimator Lens
Data.............................................\.........................\...11

Table B2. Tolerance Data
Summary........................................................................................11

Table B3. Surface
Tolerances...............................................................................................12

Table B4. Wedge
Tolerances................................................................................................12

Table B5. Glass
Tolerances..................................................................................................12

Table B6. Element
Tolerances.............................................................................................\...12

Table B7. Surface
Data.......................................................................................................12

Table B8. Element Data

Table B9. Index
Data.........................................................................................................13

Table B10. TCE
Data.......................................................................................................\...13

Figures:

Figure B1. IR Testbed
Collimator......\......\................................................................................10

Figure B2. ZnSe
Lens............................\..............................................................................14

Figure B3. BaF~2~
Lens...............................\............................................................................14

Figure B4. LiF
Lens\....................................\.........................................................................16

**B1. Introduction**

**B1.1 General Introduction**

This optical system will be used in an infrared testbed designed to test
the optical performance micro-shutter mems devices. The three lens
collimator is used to take collimated light and create a diffraction
limited point source at the micro-shutter device. After light passes
through the shutter, a replica of the previous three lens collimator is
used to re-collimate the light. The system was designed to create an
f/15 testbed with a full field of view of 0.250^0^ at the micro-shutter
array. The collimator is designed using Zemax to work at wavelengths
from 633nm to 5um with no anti-reflection coatings. Although the lens
assembly will be mounted in a barrel by the lens manufacturer, a flange
is not required on the mount.

**B1.2 Environment**

This optical system will operate in a lab environment. As such, its
design and manufacture shall incorporate appropriate safeguards to
ensure that all performance goals and system stability are satisfied
within this environment. The lens barrel mounting system shall maintain
proper alignment of the optics over the specified survivability
temperature range and handling of the system in a lab environment.

**B1.3 Scope of Work**

Figure B1 illustrates the lens layout of the collimator. Note that two
of these lens assemblies will be required. One system will be used to
create a point source from collimated light, the other will be used to
create collimated light from a point source. The scope of work described
in this document includes (1) the lens manufacture requirements, (2) the
mounting system design, and (3) performance testing for the completed
assembly. The scope of this work does not include incorporating the
optical assembly into the infrared testbed set-up.

Although this lens system was designed to perform from 632.8nm to 5
microns, for the purposes of this document all wavelength related
tolerance data and the prescription data is given with respect to the
test wavelength of 632.8nm. Also, the dewar windows, which were modeled
in the development of these lenses, have been removed for the purposes
of this document.

![](media/image9.wmf){width="2.959055118110236in"
height="3.3728346456692915in"}

Figure B1. IR Testbed Collimator Overview

The lens manufacture, tolerance and mounting system shall conform to the
specifications given in Tables 2 -- 10. Zemax prescription data is
available to aid in the lens mounting and design layout. General lens
data are listed in Table B1.

## Table B1. General Testbed Collimator Lens Data

  -------------------------------------------- --------------------------
  Surfaces                                     6

  System Aperture (Entrance Pupil Diameter)    *56.90mm*

  Glass Catalog                                Infrared

  Design Temperature                           20ºC

  Design Pressure                              1 *atm*

  Operating Temperature                        20ºC
                                               ![](media/image10.wmf) 4ºC

  Effective Focal Length                       702.892 *mm*

  Back Focal Length                            616.923*mm*

  Total Track                                  660.593*mm*

  Working F/#                                  13.8

  Image Space N.A.                             0.0361

  Stop Diameter                                *56.90mm*

  Design Wavelengths                           0.633, 1, 2, & 5 microns

  Test Wavelength                              632.8 *nm*
  -------------------------------------------- --------------------------

**B2. Number of Lens Systems**

Two lens systems will be manufactured as per the requirements set forth
in this document.

**B3. Optical Coatings**

The lens elements shall **[not]{.underline}** be treated with an
anti-reflection optical coatings.

**B4. Lens Covers**

The lens assembly shall be equipped with lens covers only if this does
not add additional cost to the lens assembly.

**B5. Tolerance Data**

**B5.1 General Tolerances**

The lens manufacture, alignment, and mounting shall conform to the
following general tolerances. Tolerances for specific lenses will be
defined later in this document.

## Table B2. Tolerance Data Summary

  ---------------------------------- ------------------------------------
  Surface Figure                     0.1 Waves PV @ 632.8nm

  Surface Quality                    60/40 Scratch Dig

  Surface Roughness                  15-20 **Å** RMS

  Material Index                     0.001

  Abbe Number                        0.5
  ---------------------------------- ------------------------------------

*B5.1.2 Surface Tolerances*

Each radius has been fitted to test plate indicated. The power tolerance
is the percent deviation of the radius of curvature from the nominal
value. Irregularity is in double pass fringes at 2 microns.

***B5.1.2.1 Surface Tolerances***

#### Table B3. Surface Tolerances

+---------+---------+-----------+-------+------------+----------------+
| *       | **R     | **Test**  | **Rad | **T        | **Thickness    |
| *Surf** | adius** |           | ius** | hickness** | Tol** (*mm*)   |
|         |         | **Plate   |       |            |                |
|         | (*mm*)  | \#**      | **    | (*mm*)     |                |
|         |         |           | Tol** |            |                |
+---------+---------+-----------+-------+------------+----------------+
| 1       | 106.63  | TP000469  | 0.05% | 16.92      | +/-0.1         |
+---------+---------+-----------+-------+------------+----------------+
| 2       | 90.28   | TP000429  | 0.05% | 7.63       | +/-0.1         |
+---------+---------+-----------+-------+------------+----------------+
| 3       | 111.31  | TP000477  | 0.1%  | 6.35       | +/-0.1         |
+---------+---------+-----------+-------+------------+----------------+
| 4       | 518.7   | TP000841  | 0.1%  | 6.44       | +/-0.1         |
+---------+---------+-----------+-------+------------+----------------+
| 5       | -471.17 | TP000823  | 0.1%  | 6.35       | +/-0.5         |
+---------+---------+-----------+-------+------------+----------------+
| 6       | -3750.2 | TP001015  | 0.1%  | \--        | \--            |
+---------+---------+-----------+-------+------------+----------------+

### B5.1.2.2 Surface Wedge Tolerances

#### Table B4. Wedge Tolerances

+-----------------+--------------------------+-------------------------+
| Surf            | Surface Tilt *X*         | Surface Tilt *Y*        |
|                 |                          |                         |
|                 | *(mm)*                   | *(mm)*                  |
+-----------------+--------------------------+-------------------------+
| 1               | 0.009                    | 0.009                   |
+-----------------+--------------------------+-------------------------+
| 2               | 0.009                    | 0.009                   |
+-----------------+--------------------------+-------------------------+
| 3               | 0.018                    | 0.018                   |
+-----------------+--------------------------+-------------------------+
| 4               | 0.018                    | 0.018                   |
+-----------------+--------------------------+-------------------------+
| 5               | 0.018                    | 0.018                   |
+-----------------+--------------------------+-------------------------+
| 6               | 0.018                    | 0.018                   |
+-----------------+--------------------------+-------------------------+

### B5.1.2.3 Index Tolerances

TableB 5. Glass Tolerances

  ------------------------- ---------------------- -----------------------
  **Glass**                 **Index Tol**          **Abbe Tol**

  ZnSe                      0.001                  0.5

  BaF~2~                    0.001                  0.5

  LiF                       0.001                  0.5
  ------------------------- ---------------------- -----------------------

### B5.1.2.4 Element Tolerances

Table B6. Element Tolerances

+----------+----+-----+------------+------------+---------+----------+
| *        | ** | **  | *          | *          | **Tilt  | **Tilt   |
| *Element | Sr | Srf | *De-center | *De-center | X**     | Y**      |
| \#**     | f1 | 2** | X**        | Y**        |         |          |
|          | ** |     |            |            | (*de    | (*d      |
|          |    |     | (*mm*)     | (*mm*)     | grees*) | egrees*) |
+----------+----+-----+------------+------------+---------+----------+
| 1        | 1  | 2   | 0.25       | 0.25       | 0.08    | 0.08     |
+----------+----+-----+------------+------------+---------+----------+
| 2        | 3  | 4   | 0.20       | 0.20       | 0.08    | 0.08     |
+----------+----+-----+------------+------------+---------+----------+
| 3        | 5  | 6   | 0.25       | 0.25       | 0.08    | 0.08     |
+----------+----+-----+------------+------------+---------+----------+

# B6. Prescription Data

Manufacture & testing assumed at STP (20ºC and 1 *atm*)

### B6.1 Surface and Element Data

*B6.1.1 Surface Data*

Table B7. Surface Data

+-----+-------+----------+---------+------+-------------+------------+
| **  | **Rad | **Thi    | **Th    | *    | **Clear     | **Conic**  |
| Sur | ius** | ckness** | ickness | *Gla | Aperature** |            |
| f** |       |          | Label** | ss** |             |            |
|     | (     | (*mm*)   |         |      | (*mm*)      |            |
|     | *mm*) |          |         |      |             |            |
+-----+-------+----------+---------+------+-------------+------------+
| 1   | 1     | 16.92    | t~1~    | ZnSe | 56.90       |            |
|     | 06.63 |          |         |      |             |            |
+-----+-------+----------+---------+------+-------------+------------+
| 2   | 90.28 | 7.63     | t~2~    |      | 51.45       |            |
+-----+-------+----------+---------+------+-------------+------------+
| 3   | 1     | 6.35     | t~3~    | Ba   | 51.89       |            |
|     | 11.31 |          |         | F~2~ |             |            |
+-----+-------+----------+---------+------+-------------+------------+
| 4   | 518.7 | 6.44     | t~4~    |      | 51.47       |            |
+-----+-------+----------+---------+------+-------------+------------+
| 5   | -4    | 6.35     | t~5~    | LiF  | 50.95       |            |
|     | 71.17 |          |         |      |             |            |
+-----+-------+----------+---------+------+-------------+------------+
| 6   | -3    | \--      |         |      | 50.54       |            |
|     | 750.2 |          |         |      |             |            |
+-----+-------+----------+---------+------+-------------+------------+
| IMA | Inf   |          |         |      |             |            |
|     | inity |          |         |      |             |            |
+-----+-------+----------+---------+------+-------------+------------+

*B6.1.2 Element Data*

Table B8. Element Data

+-----------+-----+-----+-------------------+-------------------------+
| **Element | **  | **  | **Lens Diameter** | **Edge Thickness**      |
| \#**      | Srf | Srf |                   |                         |
|           | 1** | 2** | **(mm)**          | **(mm)**                |
+-----------+-----+-----+-------------------+-------------------------+
| 1         | 1   | 2   | 63.50             | 16.80                   |
+-----------+-----+-----+-------------------+-------------------------+
| 2         | 3   | 4   | 57.15             | 3.92                    |
+-----------+-----+-----+-------------------+-------------------------+
| 3         | 5   | 6   | 57.15             | 6.95                    |
+-----------+-----+-----+-------------------+-------------------------+

### B6.2 Index of Refraction Data

Table B9. Index Data

  -------------- -------- -------------------- ------------------------------------------
  **Glass**      **Temp   **Pressure (*atm*)** **Index
                 (ºC)**                        for**![](media/image11.wmf)**(632.8nm)**

  ZnSe           20.00    1.00                 2.5906

  BaF~2~         20.00    1.00                 1.4732

  LiF            20.00    1.00                 1.3913
  -------------- -------- -------------------- ------------------------------------------

### B6.3 Thermal Coefficient of Expansion Data

Table B10. TCE Data

  ---------------------------------- ------------------------------------
  **Glass**                          **TCE (**![](media/image12.wmf)**)**

  ZnSe                               7.1

  BaF~2~                             18.4

  LiF                                34.4
  ---------------------------------- ------------------------------------

**B7. Element Drawings**

B7.1 ZnSe Lens

![](media/image13.wmf){width="7.4in" height="5.55in"}

Figure B2. ZnSe Lens

B7.2 BaF~2~ Lens

![](media/image14.wmf){width="7.4in" height="5.55in"}

Figure B2. BaF~2~ Lens

B7.3 LiF Lens

![](media/image15.wmf){width="7.4in" height="5.55in"}

Figure B4. Element #3

**B8. Performance Requirements**

Each lens system should be tested to make sure that in **single-pass**
its wavefront error does not exceed 0.1 waves rms.