OEM Calibrators:
Hydrogen Fluoride Gas Cell
HF
Hydrogen Fluoride gas absorption has been widely
researched and identified by national standards bodies
as a wavelength reference in the wavelength range from
1260nm to 1350nm.
The cells are sealed for long life and feature advanced
optical design with wedged sapphire windows for very
low level of interference artifacts. The cells are offered inpressures that are suitable for the particular user
application.

1. A sub miniature package with built in photodiode.
2. With fiber input and output for applications needing
optical output or desiring the flexibility of thisconfiguration.
The units may be ordered with a metal instrument
housing which is useful to protect the cell pigtails in alaboratory settingFeatures• Reliable tube, >20 year life
• AR coated optics and wedged sapphire windows
for low level of spectral artifacts• Rugged miniaturized package• Custom pressure and connectors

1Specifications (preliminary)• Low cost, aggressive volume discounts• Convenient mounting

Gas Lines:
Wavelength Range

nm

1255nm to 1351

Wavelength Accuracy

nmnm±0.0003 (1 sigma, 50 Torr)±0.0001 (1 sigma, 10 Torr)

Temperature dependence

nm<0.00001/°C

HF Pressure (25 °C)
2Absorption line depth (P5)

• Embedded calibrator for tunable laser or OSA

not detectable• Wavelength locker

nm
nm

0.030 typical (50Torr)
0.008 typical (10 Torr)• Out of band calibration source for tunable etalon
filters (see our Reference Design)

Torr

10 to 200 ±10% (custom)dBdB

4 typical (50 Torr)
3 typical (10 Torr)

Atmospheric pressure orhumidity dependence
Linewidth (-3dB)

Applications

Interference artifacts

dB

<0.1

Cell Lifetimeyears>20• Laboratory Calibration source

Ordering Information (example)
Photodiode:Net responsivity

A/W

HF

>0.5

Capacitance (0V)pf

80 typical

Shunt resistance

M>5-C-

50
Pressure:
Torr

Type:
1.
2.

Specifications subject to change without notice
For instruments that have resolution better then the line width. When probed withlower resolution devices contrast is reducedw

λavelength

Cell with pigtails: C
Photodiode output: CP
With metal housing: CH-

None

Connector(s):
FCPC
FCAPC
SCPCSCAPC
None

Wavelength References

eferences

14711 S Buckner Creek Rd
Mulino, OR 97042 USA
Tel: (503) 632-5240 632-5215(fax)
Email: sales@wavelengthreferences.com

Intensity3(nm)

Pressure
Shift2
pm/Torr

R(8)
R(7)
R(6)
R(5)
R(4)
R(3)
R(2)
R(1)
R(0)

1253.84373
1255.29999
1257.75174
1260.74150
1264.27199
1268.34679
1272.97030
1278.14782
1283.88556+0.0038+0.0043+0.0048+0.005+0.0048+0.0032+0.0-0.0008-0.0056

0.01
0.05
0.2
0.5
1.2
2.2
3
3.1
1.9

P(1)
P(2)
P(3)
P(4)
P(5)
P(6)
P(7)
P(8)

1297.07004
1304.53367
1312.59085
1321.25235
1330.52989
1340.43632
1350.98564
1362.19301+0.0045-0.0008-0.0016-0.0016-0.0016-0.0020-0.0027-0.0032

1.6
2.2
1.9
1.1
0.5
0.2
0.05
0.01

Line

Wavelength1dB/cm1)Wavelengths stated for low pressures (<10 Torr). Accuracy ±0.05pm2)Accuracy ±0.001 pm/Torr3)Intensity given valid for pressures greater then 25 Torr at 25 degC. For
lower pressures intensity is reduced

HF fiber coupled gas cell
Note miniature photodiode coupled cell is considerable smaller

Hydrogen Fluoride absorption spectra vacuum
wavelengths and pressure shift. Line data derived fromthe HITRAN, a spectroscopic database involving
research and standards bodies worldwide. It is
headquarted at the Harvard Smithsonian Center for
Astrophysics and contains the most accurate
spectroscopic data in the world. The pressure shift data
is from Herget et al "Infrared Spectrum of Hydrogen
Fluoride", J Opt Soc America Vol 52 #10 pp1113-19
October 1962.
Note that the dimer H2F2 is generally present to varying
concentrations depending on gas pressure andtemperature. For room temperature (25 degC) at 100
Torr pressure the concentration of dimer will be in theneighborhood of 25%. For pressures below 25 Torr thedimer concentration is generally negligible at roomtemperature and above. The presence of the dimer
effectively reduces the concentration of the monomer
but does not change the wavelength of the absorption
lines except through the weak dependence on pressure
shift. The most evident effect will be the absorption
width getting larger at higher temperatures due to theincrease in monomer concentration.