Refocusing couplers for Dewar devices
Refocusing couplers are designed for the coupling of IR-fiber optical cables with SMA termination to an MCT / InSb detector installed inside an LN-cooled Dewar with a side window.
- The simplest lens coupler is a standard or customized construction which is fixed on the side window of LN-cooled Dewar and is adjustable in 3 dimensions – X-Y for the lens and Z for connector position.
- An advanced version of the coupler is based on pre-aligned parabolic mirrors to eliminate chromatic aberrations and includes purging option to avoid atmospheric disturbance in spectral details of the object
- Both couplers have an SMA-adaptor for infrared fiber optical cable with SMA-termination
- Two types of infrared cables can be provided for different spectral range detectors and lasers
|Coupler Type||Lens coupler||Mirror coupler|
|Optic elements||ZnSe lens 3-5 or 8-12μm AR-coating||Two parabolic mirrors|
|Dimensions||Diameter 55 mm Length 40 mm||150*120*100mm, space for Dewar and pre-amplifier included|
|Alignment options||Angular translation stage ±2.5° in both orthogonal axes; Z-translation stage ± 5mm||X-Y alignment of the mirror inside the coupler, Z-translation of the Dewar|
|Other options||Purging is possible|