格兰汤姆森棱镜
Description:
Glan Thompson polarizer is made of two calcite prisms or α-BBO prisms cemented together. Two types of Glan Thompsons are available. One is the standard form and the other is the long form. Their length to aperture ratios is 2.5:1 and 3.0:1 respectively. Glan Thompsons tend to have higher extinction ratio than air spaced polarizers. In the ultra violet spectrum, their transmission is limited by absorption in birefriengent materials as well as the cement layer.
Applications:
Core Optronics can supply α-BBO and Calcite Glan Thompson polarizers for UV/VIS/NIR application.
Specification:
| Material | α-BBO, Calcite |
| Wavelength Range | α-BBO: 220-900 nm; Calcite: 350-2300 nm |
| Extinction Ratio | Calcite:<5x10-5; α-BBO:<5x10-6 |
| Parallelism | <1 arc Min |
| Surface Quality | 20/10 scratch/dig |
| Beam Deviation | < 3 arc minutes |
| Wavefront Distortion | λ/4@633nm |
| Damage Threshold | >200 MW/cm2 |
| Coating | Single MgF2 |
| Mount | Black Anodized Aluminum |