Multipass Gas Cells
Carbon Monoxide, Water, Dual Gas,Tri-Gas
L-band calibrators, C+L band, S-band, or S+C+L band
we offer them all.
Carbon monoxide gas absorption has been widely
researched and identified by national standards bodies asa primary wavelength reference in the band 1560nm1630nm. Water has many absorption lines in the 13301480nm range.
The cells feature a 80 cm absorption path in acompact multipass housing. The cells can be ordered witheither isotope carbon monoxide or combined withacetylene, hydrogen cyanide, or methane to extend thecalibration range. Water can also be provided which offers
many absorption lines in the S-band
The cells are also offered in an instrument housingwith bulkhead optical connectors which is useful for alaboratory setting for ruggedness and convenience. Up tothree cells can be placed in one housing and can include
our popular acetylene, HCN, or HF cell as well.

Specifications• Reliable hard sealed tube, >10 year life
• AR coated optics, wedged windows for low levelof interference effects• Rugged package• Available with fiber in/out or with built inphotodiode• Custom pressure, combination gas cell

General
Optical PathFeatures

cm

Optical fiber

80 (5 pass design)
SMF28 input and output (S option)
SMF28 in multimode out (M option)

Optical insertion loss (25 degC)

dB<3 (M option), <3.5 (S option)

Insertion loss temperaturedependence 0 to 60 degC

dB<±1 (M option), <±3 (S Option)

Optical return lossdB

>30dB (M option), >50dB (S option)• Extend wavelength range of gas cell to C + L
band or S-band

Applications

Operating Temperature

degC0 to 65 (+10 to 65 water cell)Gas pressure

Torr<7002• Calibration lab source

Spectral ripple

dB<0.1 dB in any 5nm span

Cell lifetimeyear>10• Embedded calibrator for tunable laser

Cell Sizecm

18 X 3.7 X 1.8

Wavelength Range

nm

1560-1597 carbon12
1594-1638 carbon13

Wavelength Accuracynm±0.0003 (varies with line, manylines known to ±0.00001)• Wavelength locker

Carbon monoxide Lines

Temperature dependencepm<0.005 pm/degC

Absorption depthdB

0.8dB one isotope present
0.4dB both isotopes presentnmnmnm1518-1595
1518-1638
1330-1595

12

CO +H CN12
CO+13CO+H12CN
12
CO+C2H2+H2O
Other Combinations available

Ordering Information (example)
CO+HCN

Combination cells
12• Embedded calibrator for OSA

Type:
Carbon monoxide: CO
Add HCN: CO+HCN
Add C2H2: CO+C2H2
H20: water- 12/12 - S - 200/5
Isotope:λNone
Connector:

Carbon 12: 12
Carbon 13: 13

Pressure:
Torr: CO (+HCN)

Fiber:
1. Specifications subject to change without notice
2. Minimum linewidth at pressures <100Torr is 0.005nm. Match pressure to application for best
performance-FCPCFCAPC
SCPC
SCAPC
None

Single mode in and out: S
Single mode in multimode out:M
Single mode with photodiode: SP

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

-1

1-1.5

1.5-2

2-2.5

2.5-3

3-3.5

3.5-4

4Transmission (dB)

Transmission (dB)

− 1.461Ai ,2Cyanide Cell

− 3.845

Wavelength (nm)• Cyanide gas cell is SRM 2519 equivalent• Dimensions are 18.5cm X 2.4cm X 1.3cm

Tri-gas cell15201540

15101520

1540

1560

1580

1600

1620

1560

Ai 1580,116001620

Wavelength (nm)

1640

16403

1.64×10• Tri-gas cell is unique to Wavelength References. Gases are
C12 hydrogen cyanide,C12 and C13 carbon monoxide

Transmission (dB)

Transmission (dB)

• Dimensions are 18.5cm X 3.7cm X 1.8cm

Hydrogen Fluoride Cell

Acetylene Cell

Wavelength (nm)Wavelength (nm)• Acetylene gas cell is SRM 2517 equivalent• Dimensions 4.7cm X 1.4cm X 1cm• Hydrogen Fluoride cell is unique to WavelengthReferences• Dimensions 5cm X 2.4cm X 1.4cmTransmission (dB)

Gas cell spectra shown are the most popular versions but are only
samples of the large array of gases that we have dealt with. In addition tofiber coupled versions we also supply bare glass tubes filled with many
pure gases and gas mixtures.
We pride ourselves on the low ripple of our gas cells. Ripple is generally
caused by parasitic etalons in the optical path. We use all coated wedged
and tilted optics to minimize these effects as can be seen by the spectra
examples.

Water Cell

Our cells with withstand severe environmental conditions and have beentested and are used by many of the major test and measurementcompanies in the fiber optic industry. In addition our devices findapplication in university and other research and diverse sensing areas
Popular versions ordering information:

Wavelength (nm)• Water vapor cell has lines throughout S-band•from 1330 to 1500nm
Dimensions 18.5cm X 3.7cm X 1.8cm• C2H2-12-M-F-200-FCPC (200Torr fiber coupled acetylene cell)• HCN-13-C-100-FCPC (100 Torr fiber coupled cyanide cell)• CO+CO+HCN-12/13/12-C-150/150/5-FCPC ( fiber coupled Tri-gas cell)