CC-POL Implementation: Half Wave Plates
Placed interior to cyrostat to provide highest possible accuracy and efficiency polarimeter with no enhanced thermal background and little light loss
Located directly after cryostat window to maximize polarimetric accuracy
Single crystal CdS required for 10?m window, AR coated, 30x30mm, 0.372mm thickness
Single crystal CdSe required for 20?m window, 30x30mm, 0.752mm thickness
Throughput (with AR coating) ᢗ% (TBC)
Specifications
- mechanism to insert/retract HWPs into optical axis & rotate to four set positions
- on-axis centering ɘ.5mm
- GTC to accommodate focus change
- Beam wander ɘ.2 pixels
- Possible to tilt HWPs in order to eliminate ghosting