HDTenEightyP/NetNews huggingface dataset:
From: fischedj@NeXTwork.Rose-Hulman.Edu (David J. Fischer)
Subject: Re: lab suggestions
Reply-To: fischedj@NeXTwork.Rose-Hulman.Edu (David J. Fischer)
Organization: Rose-Hulman Institute of Technology
Date: Thu, 9 Apr 1992 06:42:20 GMT

In article <1992Apr8.230245.5056@willamette.edu> slambert@willamette.edu  
(Sean Lambert) writes:
> 
> 
> 	I was wondering if anyone could suggest a fair sized lab that I
> 	could do for my optics class.  So far we have done the following
> 	labs, all of which were not very intense:
> 	Measure the speed of light
> 	Observing two-beam interference using the Michelson
> 	interferometer
> 	Observing Fraunhofer diffraction
> 	Observing Fresnel diffraction
> 	Play around with elliptically polarized light
> 
> 	some ideas for the lab, which is suppose to be about twice the
> 	size as one of these, are:
> 	Measure the speed of light across a long distance, two miles or
> 	so.
> 	Measure the speed of light in water.
> 	Play around with the Michelson interferometer when a gas is
> 	involved.
> 	sean............................slambert@willamette.edu

	One of my favorite optics labs so far was the one on Spatial  
Filtering. Use a 4F system to filter various gratings, remove horizontal  
and vertical lines from a grid. Take out the central bright spot and see  
what happens. All that good stuff. We also took pictures of it for the lab  
write-up. This was a fun lab, took 2-3 hours, and taught me a lot about  
optical fourier, fresnel, and spatial filtering. Way cool lab.
	I also recommend holography labs; making a simple reflection or  
transmission hologram.
	
--
David J. Fischer : fischedj@nextwork.rose-hulman.edu

"Don't ever put your brain on a runaway train 'cause it won't be coming  
back!" 
- Mad At The World.
From: swami@chtm.eece.unm.edu (Swami srinivasan)
Newsgroups: sci.optics
Subject: Re: lab suggestions
Date: 9 Apr 92 01:04:11 GMT
Article-I.D.: lynx.7jrj03-
Followup-To: swami@chtm.eece.unm.edu
Organization: University of New Mexico, Albuquerque

In article <1992Apr8.230245.5056@willamette.edu> slambert@willamette.edu (Sean Lambert) writes:
>
>
>	I was wondering if anyone could suggest a fair sized lab that I
>	could do for my optics class.  So far we have done the following
>	labs, all of which were not very intense:
>	Measure the speed of light
>	Observing two-beam interference using the Michelson
>	interferometer
>	Observing Fraunhofer diffraction
>	Observing Fresnel diffraction
>	Play around with elliptically polarized light
>
>	some ideas for the lab, which is suppose to be about twice the
>	size as one of these, are:
>	Measure the speed of light across a long distance, two miles or
>	so.
>	Measure the speed of light in water.
>	Play around with the Michelson interferometer when a gas is
>	involved.
>
>	sean............................slambert@willamette.edu

	If you have a He-Ne laser with 5-10 mW of power, it might be
worth doing some experiments in holography, holographic/speckle
interferometry for mechanical measurements, etc.

	There is a nice book listing some simple experiments, written
for senior level undergrad/beginning grad optics labs

	"A course of experiments with the He-Ne laser"

	Published by Wiley, 1985.
Should be an inexpensive book, paperback, about 80 pages.

	Good luck!
							swami srinivasan
========================================================================
swaminathan srinivasan
center for high tech materials
univ. of new mexico				cogito ergo sum
albuquerque, nm 87131.

swami@chtm.eece.unm.edu
========================================================================
From: swami@chtm.eece.unm.edu (Swami srinivasan)
Newsgroups: sci.optics
Subject: Re: diode/fiber coupling efficiency
Summary: are there industry standards on beam parameters?
Date: 7 Apr 92 03:22:10 GMT
Article-I.D.: lynx.1npjj6+
Organization: University of New Mexico, Albuquerque

In article <1992Apr6.134714.19975@ll.mit.edu> hemenway@ll.mit.edu writes:

>It is well known that coupling power from narrow stripe
>laser diodes into single mode optical fibers is difficult.
>
>The best yet published is work by H. Presby and C. Edwards 
>at Crawford Hill (Elect. Lett., 12 March 1992, Vol 28, 
>pp. 582-584, and the recent OFC'92 in San Jose) in which 
>a computer-controlled laser-machined aspheric lens is 
>fabricated onto silica fiber, using AT&T-proprietary details. 
>(Is AT&T learning to keep its secrets safe for a while?) 
>The authors claim 90% coupling efficiency (at 1.3 um) _WITHOUT_
>A/R coating.  (Add 4% for perfect, and distinctly nontrivial,
>coating.) A hyperbolic profile is used on the fiber. 
>It took more than two years to perfect the technique.
>
>Few claims were made about the laser actually used in the
>experiment; no doubt its "carefully calibrated" beam was 
>highly gaussian and not too divergent although the authors 
>claim that the method "does not suffer from limited aperture 
>for typical lasers.". 
>
>It seems to me that, an anamorphic profile could be created 
>by the Presby technique thereby allowing its use in ugly laser 
>beams as well.
>
>Has this nasty problem been solved for well behaved
>laser beams or does each lens have to be custom made
>for its laser? 
>
>     -Roe.

	The last point is very important. But how repeatably can we
get "well behaved" laser beams, in the first place? 

	Whether a particular anamorphic lens profile can be used with a 
given laser structure will depend on how repeatably the manufacturer
can make lasers. The uniformity and reproducibility of growth/processing
will be an issue. How good are manufacturers in this regard?

	 Are there any industry standards regarding beam parameters
such that a standard set of anamorphic fiber-lens-profiles can be used?
It would save a lot of money if we didn't have to get these custom-made.
For that matter, if beam parameters were standardized, we could also 
standard sets of regular anamorphic lenses for different wavelengths.

	Still, 90% is a phenomenal coupling efficiency, custom-made
or not. Would anyone complain if only 85% of another laser's output
were coupled into this specially lensed fiber? It will probably be a
couple of years before that 5% begins to matter a lot...

						swami srinivasan

=========================================================================
swaminathan srinivasan
center for high technology materials
eece, university of new mexico,
albuquerque, nm 87131				cogito ergo sum

swami@chtm.eece.unm.edu
=========================================================================
From: dbriggs@zia.aoc.nrao.edu (Daniel Briggs)
Newsgroups: sci.optics
Subject: RFD for IMAGE PROCESSING newsgroup
Date: 13 Apr 92 18:43:12 GMT
Article-I.D.: zia.1992Apr13.184312.4002
Organization: National Radio Astronomy Observatory, Socorro NM

[Third and last time that I'm going to try and post this.  Sorry about the
multiple posts, but something in the crosspost list is buggering things!]

I just thought I'd point out that there is a discussion about an possible
image processing group over on news.groups.  I think it's a *great* idea,
and about bloody time, too.  But I seem to be surrounded by computer
vision / computer graphics people.  Could we get some scientific image
processing people over there too?  If we don't act now, we're likely to end
up with comp.graphics.image.processing, which would be a gross restriction
on an otherwise tremendously useful group.  Actually, I'd like to see a
general imaging group, not restricted to conventional image processing
techniques, but expanded to included techniques of indirect observation,
calibration and processing, as well as general imaging theory.  Say
sci.imaging.  Do we have enough support for such a group?

-- 
| Daniel Briggs  (dbriggs@nrao.edu)                      |        USPA B-14993
| New Mexico Tech / National Radio Astronomy Observatory |            DoD #387
| P.O. Box O / Socorro, NM 87801   (505) 835-7391        |
Support the League for Programming Freedom  (info from league@prep.ai.mit.edu)
Newsgroups: sci.optics
Subject: LOTS
From: jong@helios.ece.arizona.edu (Na Jong Whoa)
Date: 12 Apr 92 18:52:44 MST
Distribution: usa,local
Organization: U of Arizona Electrical and Computer Engineeering

I heard the LOTS (Los Alamos Optical Transport Simulatior) is in public domain.
Could anyone tell me about the vendors or ftp sites ? 
Many thanks in advance.

Jong
From: wellison@kuhub.cc.ukans.edu
Newsgroups: sci.optics
Subject: Re: HeNe tubes wanted
Date: 13 Apr 92 13:35:03 CDT
Organization: University of Kansas Academic Computing Services


In article <11365@ecs.soton.ac.uk> hnr@ecs.soton.ac.uk (Harvey Rutt) writes:
>In <ccsjd-j@lynx.unm.edu> jmcclean@carina.unm.edu writes:
>
>
>>It's time for me to upgrade my puny 10 mW HeNe LASER and I am 
>>interested in finding a 35- 50 mW HeNe tube at a reasonable
>>price, pulled salvage preffered for financial reasons. I am
>>also in need of a green HeNe tube, power preferred over polarity.
>>Are there any greeny tubes available in sizes over 1.5 mW. I was
>>told by Milles Griot that 1.5 mW was their strongest greeny tube,
>>does anyone manufacture 5 or 10 mW green HeNes? I would appreciate
>>any replies to my e-mail adress: jmcclean@carina.unm.edu or responses
>>over the net. Thanks in advance-- James McClean
>

As far as Green HeNe's over 1.5 mW, they don't exist at this time. Due to the
amount of power required by a standard HeNe to produce the 543Nm line (or the
594Nm yellow and 612Nm orange lines) the power is limited. A 1.5mW Green HeNe
is really a 10mW to 12mW tube with the optics tuned to the green line. However,
a 1.5 mW green will produce as much visual intensity as a 7 mW red HeNe, as the
eye will percive it more. I have a .75 mW green HeNe and it is as bright as a 5
mW red HeNe, even though power out is only 3/4 milliwatt. If you want 10 mW or
more of green light, a multi-line argon would work quite well and a lot less
expensive than a frequency doubled ND-YAG. The agron laser has a strong line at
514Nm as well as 488Nm. I currently have a American 60X, which is producing
150mW multi-line with about 80 mW at the 514Nm line. It makes for a nice light
show laser, which is what I use it for. Used on the surplus market, they cost
about $2500 to $2800 minus the power supply, however, I have seen then for as
low as $800 for just the head. The argon also sucks the power as it is very
ineffiecint. For 150mW out, it take's about 10 amps driving current, which
figures out to a effieciency of .00125 %. So the remaining wattage is in the
form of heat, which has to be dissapated fron the laser tube. I am using a
300CFM blower to cool it.
HeNe tubes that are 35mW to 50mW are expensive, even on the surplus market. I
know of one that is a 35-40mW HeNe head which is selling for about $1400 from
MWK Industries, 198 Lewis Court, Corona, CA. 91720 (1-800-356-7714). They also
sell argons from $500 for a 5-15mW single line (488Nm) to $2800 for the
American 60X. They also have used argons that are around 5 watts multi-line for
around $9K (Way out of my price range :-) For most applications, a .75mW green
HeNe works quite nice, plus it's only $400 used, which beats the multi-line
argons and thier multi-thousand dollar price tag ;-)

=-=-= Wes Ellison -=-=-
Newsgroups: sci.optics
Subject: Solar Collection/Fresnel lenses
From: richard@ee.byu.edu (Richard Christensen)
Date: 9 Apr 92 10:03:02
Organization: Brigham Young University, Provo UT USA
Originator: richard@remus.ee.byu.edu


I want to do some experiments with solar collection.  The specs of
Edmund Scientific's fresnel lenses are surface area, focal length,
and lines per inch.  How does one figure which lens would
give the highest power density (W/m^2)  (hottest spot).  I used
this formula Area / (Pi (f A)^2).  This gives a relative power density
into a lens with the power desity of the focused image.
Does this make sense?
Edmund Scientific told me that the only thing that mattered was
the number of lines per inch.  The lower the better (counter-intuitive
isn't it).  Given that the lines per inch are equal, the power
densities will be equal.  I have a hard time believing this?

Any help would be appreciated.


--
-------------------------------------------------------
| Richard B. Christensen                              |
| richard.ee.byu.edu                                  |
| Brigham Young University 459 CB Provo, Utah 84602   |
-------------------------------------------------------
--
-------------------------------------------------------
| Richard B. Christensen                              |
| richard.ee.byu.edu                                  |
| Brigham Young University 459 CB Provo, Utah 84602   |
Newsgroups: sci.optics
From: iigsa01@convex.zdv.uni-tuebingen.de (Andreas Schilling)
Subject: Englisch-Deutsches Woerterbuch Optik
Organization: Comp. Center (ZDV) U of Tuebingen, FRG
Distribution: de
Date: Tue, 14 Apr 1992 14:23:16 GMT

Hat jemand ein gutes Dictionary mit technischen Fachwoertern (radiance, 
emmitance, ....) in maschinenlesbarer Form und koennte es mir zumailen?

Notfalls bin ich auch fuer Hinweise auf ein gedrucktes Woerterbuch dankbar.

(Ich habe mit Distrtibution: de gepostet, deshalb in Deutsch.)

Im voraus besten Dank fuer alle Hilfe

Andreas Schilling


--
|            Andreas  Schilling            |     Universitaet Tuebingen     |
| andreas@gris.informatik.uni-tuebingen.de |   Wilhelm-Schickard-Institut   |
|          tel.: +49 7071 29 5463          |   Auf der Morgenstelle 10/C9   |
|          fax.: +49 7071 29 5400          | D-7400 Tuebingen, West Germany |
Newsgroups: sci.optics
From: hemenway@ll.mit.edu
Subject: diode/fiber coupling efficiency
Summary: 90% coupling efficiency achieved w/ lensed fiber
Organization: MIT Lincoln Laboratory
Date: Mon, 6 Apr 92 13:47:14 GMT

It is well known that coupling power from narrow stripe
laser diodes into single mode optical fibers is difficult.

Aspheric lenses are required for anything but mediocre
results to correct for spherical aberation.  Some of the 
best results achieved (after having spent much of the 
last year on the problem) use
a pair of Corning molded aspheric lenses which can produce
coupling efficiencies as high as 81% in optimally chosen
fibers in the near IR (830-860 nm).  

Simple butt coupling ("endfire coupling" a better term?) can 
achieve similar but slightly inferior results but the alignment 
headaches are severe.  Lasertron (Burlington, Mass) uses a combination 
of etching and arc firing to produce fiber lenses with high 
coupling efficiencies (above 70% in lasers at 980 nm and 1550 nm).  
Occasionally they'll get an extraordinary result (over 80%). 
No effort is made, I believe, to make a hyperbolic surface.

The best yet published is work by H. Presby and C. Edwards 
at Crawford Hill (Elect. Lett., 12 March 1992, Vol 28, 
pp. 582-584, and the recent OFC'92 in San Jose) in which 
a computer-controlled laser-machined aspheric lens is 
fabricated onto silica fiber, using AT&T-proprietary details. 
(Is AT&T learning to keep its secrets safe for a while?) 
The authors claim 90% coupling efficiency (at 1.3 um) _WITHOUT_
A/R coating.  (Add 4% for perfect, and distinctly nontrivial,
coating.) A hyperbolic profile is used on the fiber. 
It took more than two years to perfect the technique.

Few claims were made about the laser actually used in the
experiment; no doubt its "carefully calibrated" beam was 
highly gaussian and not too divergent although the authors 
claim that the method "does not suffer from limited aperture 
for typical lasers.". 

It seems to me that, an anamorphic profile could be created 
by the Presby technique thereby allowing its use in ugly laser 
beams as well.

Has this nasty problem been solved for well behaved
laser beams or does each lens have to be custom made
for its laser? 

     -Roe.
From: hnr@ecs.soton.ac.uk (Harvey Rutt)
Newsgroups: sci.optics
Subject: Re: INFRARED FILTER
Date: 15 Apr 92 17:07:21 GMT

In <1992Apr15.034449.20549@njitgw.njit.edu> det0367@hertz.njit.edu (david e trent ee stnt) writes:


> I am looking for some kind of filter which will filter out ambient light
> so only my infrared signal will be passed.  There was a device such as
> this, it was an infrared lens I found in Digikey but it is unavailable at
> this time.  If someone knows of a place where I can get this device, could
> you please reply ASAP.  

> Thank You,

> Dave

Your question is a little too non-specific to give a definite answer.
It depends what combination of signal wavelength, detector and
interfering wavelengths you have; ambient light itself of course
extends into the infrared.

There are three options which come immediately to mind.
The big glass suppliers such as Hoya and Schott make a range of IR
transmitting, visible opaque glasses. These are sold on by optical
suppliers such as Lot Oriel,Melles Griot, Newport
Suitable for fairly near IR applications,
Eg keeping visible light off an Si detector with a near IR LED/laser
source.

Second possiblility is to use a slice of suitable semiconductor. Eg
GaAs transmits beyond about 0.8 microns, Si 1.1u, Ge 1.8u etc. These
are used for lenses in the IR. Usually need an AR coating as their
high n causes high surface reflection. Readily available, same sources
+ many others.    

Third is multi-layer coatings. These can be taylored to do pretty much
what you like - at a price. Often used in combination with the above
to block higher order passbands etc. Some companies do have off the
shelf standards eg to pass the 4.3u CO2 band, the 3.39u HeNe laser
line, probably for GaAs etc diode laser lines. Non standard is costly.
Can show temperature sensitivity, and beware degraded performance in
highly converging/diverging beams. Wavelength shifts with angle of
incidence. A special, common, cheap variety is the 'cold mirror' which
reflects near IR and transmits visible used in slide projectors etc;
you might use it in reflection. Again same suppliers plus specialist
coating firms such as OCLI.
I mainly know UK suppliers which probably woudn't interest you much!
From: dgg@crosfield.co.uk (deepak gupta)
Newsgroups: sci.optics
Subject: tunable optical lens
Keywords: availability
Date: 8 Apr 92 14:39:29 GMT
Organization: Crosfield Electronics, Hemel Hempstead, United Kingdom.


In the march 1992 edition of "Photonics Spectra" there's an article on page 96
describing an electrically tunable optical lens, i.e. a lens whose shape can be
varied in response to electrical stimulus.

Is this or any other 'tunable' lens available commercially, and if so, who 
from ?


Thanks in advance,

Deepak Gupta

e-mail: dgg@crosfield.co.uk
From: det0367@hertz.njit.edu (david e trent ee stnt)
Newsgroups: sci.optics
Subject: INFRARED FILTER
Date: 15 Apr 92 03:44:49 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.


 I am looking for some kind of filter which will filter out ambient light
 so only my infrared signal will be passed.  There was a device such as
 this, it was an infrared lens I found in Digikey but it is unavailable at
 this time.  If someone knows of a place where I can get this device, could
 you please reply ASAP.  

 Thank You,

 Dave
From: swami@chtm.eece.unm.edu (Swami srinivasan)
Newsgroups: sci.optics
Subject: Re: lab suggestions
Date: 14 Apr 92 07:39:22 GMT
Article-I.D.: lynx.2vxjb6n
Organization: University of New Mexico, Albuquerque


In article <7jrj03-@lynx.unm.edu> swami@chtm.eece.unm.edu (Swami srinivasan) writes:
>In article <1992Apr8.230245.5056@willamette.edu> slambert@willamette.edu (Sean Lambert) writes:
>>
>>
>>	I was wondering if anyone could suggest a fair sized lab that I
>>	could do for my optics class.  So far we have done the following
>>
>>	some ideas for the lab, which is suppose to be about twice the
>>	size as one of these, are:
>>	Measure the speed of light across a long distance, two miles or
>>	so.
>>	Measure the speed of light in water.
>>	Play around with the Michelson interferometer when a gas is
>>	involved.
>>
>>	sean............................slambert@willamette.edu
>
>	If you have a He-Ne laser with 5-10 mW of power, it might be
>worth doing some experiments in holography, holographic/speckle
>interferometry for mechanical measurements, etc.
>
>	There is a nice book listing some simple experiments, written
>for senior level undergrad/beginning grad optics labs
>
>	"A course of experiments with the He-Ne laser"
>
>	Published by Wiley, 1985.
>Should be an inexpensive book, paperback, about 80 pages.
>
>swami@chtm.eece.unm.edu


Oops! I forgot to mention - the author  is R.S. Sirohi. This book
was published in India. Should not be difficult to get hold of (our
library has a copy). 

							swami
Newsgroups: sci.optics
From: knapp@spot.Colorado.EDU (David Knapp)
Subject: Re: HeNe tubes wanted
Organization: University of Colorado, Boulder
Date: Sat, 11 Apr 1992 15:36:03 GMT

In article <11365@ecs.soton.ac.uk> hnr@ecs.soton.ac.uk (Harvey Rutt) writes:
>In <ccsjd-j@lynx.unm.edu> jmcclean@carina.unm.edu writes:
>
>
>>It's time for me to upgrade my puny 10 mW HeNe LASER and I am 
>>interested in finding a 35- 50 mW HeNe tube at a reasonable
>>price, pulled salvage preffered for financial reasons. I am
>>also in need of a green HeNe tube, power preferred over polarity.
>>Are there any greeny tubes available in sizes over 1.5 mW. I was
>>told by Milles Griot that 1.5 mW was their strongest greeny tube,
>>does anyone manufacture 5 or 10 mW green HeNes? I would appreciate
>>any replies to my e-mail adress: jmcclean@carina.unm.edu or responses
>>over the net. Thanks in advance-- James McClean
>
>Does anyone still use the old trick for revitalising HeNe tubes -
>indeed does it work on modern tubes?
>Old tubes tended to loose He by very slow diffusion thro' the glass.
>If you wrapped nichrome wire round some part of the tube away from
>seals etc., wrapped some suitable thermal insulation over that, put it
>all in a polythene bag & blew in He, then heat up the wire as much as
>you dare, you could watch the output slowly rise; stop as it starts to
>fall again as the He pressure goes over optimum. Don't over heat or
>you collapse the tube or missalign it; don't set fire to the lab! Used
>to take hours to a few days.


I had heard of people storing, and running them, in Helium at slight
pressure.  I was told this works to replace the diffused Helium.

-- 

**************************************************************************
Corrected .sig for those who did not see the absurdity of the original one.
**************************************************************************
From: jmcclean@carina.unm.edu
Newsgroups: sci.optics
Subject: HeNe tubes wanted
Date: 9 Apr 92 21:32:36 GMT
Article-I.D.: lynx.ccsjd-j
Organization: University of New Mexico, Albuquerque


It's time for me to upgrade my puny 10 mW HeNe LASER and I am 
interested in finding a 35- 50 mW HeNe tube at a reasonable
price, pulled salvage preffered for financial reasons. I am
also in need of a green HeNe tube, power preferred over polarity.
Are there any greeny tubes available in sizes over 1.5 mW. I was
told by Milles Griot that 1.5 mW was their strongest greeny tube,
does anyone manufacture 5 or 10 mW green HeNes? I would appreciate
any replies to my e-mail adress: jmcclean@carina.unm.edu or responses
over the net. Thanks in advance-- James McClean
Newsgroups: sci.optics
From: banana@panix.com (Walter Polkosnik)
Subject: Flashlamp pumped Dye Lasers
Date: Sun, 12 Apr 1992 23:07:31 GMT
Organization: PANIX Public Access Unix, NYC

Can anyone give me some info or references to where I can find info on pumping
dye lasers with flashlamps? What I know is that it can be done, but you need
flashlamps with a really quick risetime, < 1 microsecond. The lamps are 
Xe or Hg, and I hear that they have short lifetimes.

I would appreciate if anyone could let me know whether it's practical to build
one from scratch, references to articles on how to build one, and sources of
these type of flashlamps. The application is holography.

Please send e-mail replies to banana@panix.com

-- 
Walter Polkosnik                 
Physics Department         banana@panix.com        
Queens College, CUNY       {cmcl2,apple}!panix!banana