T-GTH5-A - Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, ARC: 350 - 700 nm
T-GTH5-A - Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, ARC: 350 - 700 nm
Our calcite polarizers are all based on high-grade, birefringent calcite crystals. Due to the birefringent nature of calcite, waves polarized in the direction of the optical axis propagate with a different index of refraction than waves polarized orthogonally to the optical axis. In our mounted Glan-Thompson polarizers, this birefringence causes the selective reflection and absorption of one polarization state of an incident beam and the transmission of the other orthogonal polarization state. When unpolarized light is incident on the optic, extraordinary rays pass straight through the polarizer while ordinary rays are reflected at an angle that depends on the light's wavelength and the length of the polarizer. The reflected ordinary rays are then scattered and partially absorbed by the optic's housing, resulting in a highly polarized output.
A calcite polarizer can be designed as either a polarization splitter/combiner or as a polarizer element that removes the angled, orthogonally polarized component of a beam. Our calcite polarizers are typically built out of two prisms, as shown in the drawing to the right. Since calcite is a soft crystal that is easily damaged, almost all of our calcite polarizers are offered in metal housings. With convenient threadings and adapters, these housings can easily be mounted into our opto-mechanical products.
| Damage Threshold Specifications | |
|---|---|
| Laser Output | Damage Threshold |
| Pulsed | 2 J/cm2 at 1064 nm, 10 ns, 10 Hz, Ø0.476 mm |
| CW | 2 kW/cm at 1064 nm, Ø0.092 mm |
- Wide Field of View: 40° Typical (FOV1 + FOV2)
- High Extinction Ratio: 100 000:1
- 350 nm to 2.3 μm Operation for Uncoated Prisms
- AR-Coated Versions for 350 - 700 nm or 650 - 1050 nm Range
- Highest Grade Optical Calcite
- Cemented Prisms