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.
Key Features
- 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
Specifications
| 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 |