GLAN THOMPSON
The Glan Thompson polarizer is made of two calcite 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 a higher extinction ratio than air-spaced polarizers. In the ultraviolet spectrum, their transmission is limited by absorption in calcite as well as the cement layer. These polarizers can be used from about 350 to 2300 nm.
Specifications:
B grade calcite: greater than one wave wavefront deformation @ 633 nm due to striae only
A grade calcite: quarter to one wave wavefront deformation @ 633 nm due to striae only
S grade calcite: quarter wave wavefront deformation @ 633 nm due to striae only
E type: made of S grade calcite, but polarizer has beam deviation of one arc minute
Surface flatness: at least quarter wave @ 633 nm over the clear aperture
Transmission (uncoated): 35-40% at 350 nm, 65-70% at 400 nm, 80-88% at 500 nm and longer wavelengths
please visit Anti Reflection Coating page for reflectivity plots of available coatings
Calcite is a natural mined crystal. Defects in bulk calcite are characterized by bubbles ( presence of randomly scattered bubbles vary from relatively large to small sizes and fine bubble lines), striae ( streaks of sudden variation of refractive index which can be detected interferometrically ), optical inhomogeneity ( gradual variation of refractive index in bulk material ) and stress birefringence ( variation of birefringence in bulk material due to defective growth of the crystal ). These defects cause degradation of polarization and transmission loss due to scattering and absorption.
|
GLAN THOMPSON - STANDARD FORM |
|
Catalog Number |
Clear Aperture Diameter (mm) |
Mount Dimensions (Inches) |
Remarks | |
|
Outside Diameter +/- .0015 |
Length +/- .007 |
|||
| MGT25B 5 | 5 | .623 | .875 |
Grade B Extinction 5*10^-5 Beam Deviation 5 Arc Minutes
|
| MGT25B 8 | 8 | .748 | 1.125 | |
| MGT25B10 | 10 | .873 | 1.375 | |
| MGT25B12 | 12 | .998 | 1.500 | |
| MGT25B14 | 14 | 1.123 | 1.875 | |
| MGT25B16 | 16 | 1.373 | 2.125 | |
| MGT25B20 | 20 | 1.623 | 2.375 | |
| MGT25A 5 | 5 | .623 | .875 |
Grade A Extinction 1*10^-5 Beam Deviation 3 Arc Minutes
|
| MGT25A 8 | 8 | .748 | 1.125 | |
| MGT25A10 | 10 | .873 | 1.375 | |
| MGT25A12 | 12 | .998 | 1.500 | |
| MGT25A14 | 14 | 1.123 | 1.875 | |
| MGT25A16 | 16 | 1.373 | 2.125 | |
| MGT25A20 | 20 | 1.623 | 2.375 | |
| MGT25S 5 | 5 | .623 | .875 |
Grade S Extinction 5*10^-6 Beam Deviation 3 Arc Minutes
|
| MGT25S 8 | 8 | .748 | 1.125 | |
| MGT25S10 | 10 | .873 | 1.375 | |
| MGT25S12 | 12 | .998 | 1.500 | |
| MGT25S14 | 14 | 1.123 | 1.875 | |
| MGT25S16 | 16 | 1.373 | 2.125 | |
| MGT25S20 | 20 | 1.623 | 2.375 | |
| MGT25E 5 | 5 | .623 | .875 |
Grade S Extinction 1*10^-6 Beam Deviation 1 Arc Minutes
|
| MGT25E 8 | 8 | .748 | 1.125 | |
| MGT25E10 | 10 | .873 | 1.375 | |
| MGT25E12 | 12 | .998 | 1.500 | |
| MGT25E14 | 14 | 1.123 | 1.875 | |
| MGT25E16 | 16 | 1.373 | 2.125 | |
| MGT25E20 | 20 | 1.623 | 2.375 | |
|
GLAN THOMPSON - LONG FORM |
|
Catalog Number |
Clear Aperture Diameter (mm) |
Mount Dimensions (Inches) |
Remarks | |
|
Outside Diameter +/- .0015 |
Length +/- .007 |
|||
| MGT3B 5 | 5 | .623 | .875 |
Grade B Extinction 5*10^-5 Beam Deviation 5 Arc Minutes
|
| MGT3B 8 | 8 | .748 | 1.250 | |
| MGT3B10 | 10 | .873 | 1.625 | |
| MGT3B12 | 12 | .998 | 1.875 | |
| MGT3B14 | 14 | 1.123 | 2.000 | |
| MGT3B16 | 16 | 1.373 | 2.250 | |
| MGT3B20 | 20 | 1.623 | 2.875 | |
| MGT3A 5 | 5 | .623 | .875 |
Grade A Extinction 1*10^-5 Beam Deviation 3 Arc Minutes
|
| MGT3A 8 | 8 | .748 | 1.250 | |
| MGT3A10 | 10 | .873 | 1.625 | |
| MGT3A12 | 12 | .998 | 1.875 | |
| MGT3A14 | 14 | 1.123 | 2.000 | |
| MGT3A16 | 16 | 1.373 | 2.250 | |
| MGT3A20 | 20 | 1.623 | 2.875 | |
| MGT3S 5 | 5 | .623 | .875 |
Grade S Extinction 5*10^-6 Beam Deviation 3 Arc Minutes
|
| MGT3S 8 | 8 | .748 | 1.250 | |
| MGT3S10 | 10 | .873 | 1.625 | |
| MGT3S12 | 12 | .998 | 1.875 | |
| MGT3S14 | 14 | 1.123 | 2.000 | |
| MGT3S16 | 16 | 1.373 | 2.250 | |
| MGT3S20 | 20 | 1.623 | 2.875 | |
| MGT3E 5 | 5 | .623 | .875 |
Grade S Extinction 1*10^-6 Beam Deviation 1 Arc Minutes
|
| MGT3E 8 | 8 | .748 | 1.250 | |
| MGT3E10 | 10 | .873 | 1.625 | |
| MGT3E12 | 12 | .998 | 1.875 | |
| MGT3E14 | 14 | 1.123 | 2.000 | |
| MGT3E16 | 16 | 1.373 | 2.250 | |
| MGT3E20 | 20 | 1.623 | 2.875 | |