Compact Circular Multipass Cell
|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|
|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|
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.