Products / Multipass Cell for Spectroscopy /

IRcell
Compact Circular Multipass Cell

Specifications

Optical path length	349 cm / 137"
Input-output beam angle	28 degree horizontal
	3 degree vertical
Beam alignment tolerance	± 0.002 degree horizontal
	± 0.1 degree vertical
Ideal numerical aperture (NA)	0.027
Input hole diameter	4 mm / 0.157"
Fringe level	<2.0 x 10^-4 rms @ λ = 4.3 µm
Wavelength range	NIR / mid-IR / THz
Gas volume	38 ml
Gas fittings	Swagelok 6 mm or 1/4" or whitworth G 1/8"
Absolute pressure range	0-1 bar / 0-750 torr
Leak rate	<1 x 10^-7 bar x l/s
Mirror surface	Gold
O-Ring material	NBR
Absorption mask material	Teflon, others on request
Window material options	BaF₂, CaF₂, Al₂O₃, N-BK7, others on request
Dimensions	10 cm diameter, 3.3 cm height (excluding gas connectors)
Mounting	3 x M6

Description

Keeping track of trace gas levels is of critical importance in a wide range of applications. For low abundance trace gases, small absorptions can be observed by increasing the optical path length. This is achieved using multi pass cells.

With the IRcell, we offer a multi pass cell consisting of only a single, circular mirror. The cell body is at the same time the mirror reflecting the optical beam.

The advantage of such a configuration lies in its robustness towards mechanical stress such as vibrations or temperature changes. With this design, we offer an optical path of 3.5 m.