Glan Polarizing Prisms
The prisms are made of calcite which is practically striae- and bubble-free. The light gets polarized by total internal reflection of the beam with ordinary polarization at the boundary to the air gap between the two prisms.
The Glan polarizers can be ordered with side exit windows as an option. In version without side windows the reflected beam gets absorbed at the blackened side surfaces of the prism. Therefore, this version is not suited for elevated light intensities. The version with side windows allows the reflected beam to exit at an angle of approx. 72° with respect to the incident beam. The beam direction of the reflected beam shows chromatic dispersion.
By default, the prisms are delivered in a cylindrical mount and without antireflection coating.
We offer several options for increased specifications on selected parameters (s. table below). It is possible to combine multiple options
Optical specifications
| version | standard | Interferometer | UV | High power | High extinction |
| spectral range | 350-2700 nm |
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250-2700 nm |
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| extinction ratio | 10-6 |
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10-7 |
| wavefront distortion in T (R) | <λ/2 (<2λ) | <λ/10 (<2λ) |
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| prismatic deviation | <2' |
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| air gap | 0,07 mm |
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| cut angle | ca. 39° |
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| field of view | ±4° |
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| damage threshold (10ns, 1064 nm) | not specified |
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>300MW/cm² |
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Optical specifications
| format | |
10 mm | 12 mm | 15 mm | 20 mm |
| Article-No. ohne Seitenfenster | PGL 10 | PGL 12 | PGL 15 | PGL 20 | |
| Article-No. with Seitenfenster | PGL 10.2 | PGL 12.2 | PGL 15.2 | PGL 20.2 | |
| free aperture | [mm] | 9,5 | 11,5 | 14,5 | 19,5 |
| mount diameter | [mm] | 25 | 25 | 25 | 36 |
| mount length ohne Seitenfenstern | [mm] | 22 | 30 | 30 | 30 |
| mount length with zwei Seitenfenstern | [mm] | 30,5 | 35,7 | 42 | 50 |
Preise Version ohne Seitenfenster
| order no. | 1 piece in € | 2 piece in € | 3-5 piece in € |
|---|---|---|---|
| PGL 10 | 1175.- | 1065.- | 1010.- |
| PGL 12 | 1486.- | 1348.- | 1278.- |
| PGL 15 | 1895.- | 1737.- | 1658.- |
| PGL 20 | 2970.- | 2723.- | 2525.- |
Preise Version mit zwei Seitenfenster
| order no. | 1 piece in € | 2 piece in € | 3-5 piece in € |
|---|---|---|---|
| PGL 10.2 | 1648.- | 1561.- | 1460.- |
| PGL 12.2 | 2074.- | 1880.- | 1783.- |
| PGL 15.2 | 2567.- | 2353.- | 2246.- |
| PGL 20.2 | 3784.- | 3468.- | 3216.- |
Price custom version
| option | order-no.: | additional price |
| interferometer quality wavefront distortion <λ/10(<2λ in reflection) | PGL 0.I | 30 % |
| UV quality usable wavelengthrange 250-2700 nm | PGL 0.UV | 20 % |
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high power version particular low scatter and surface defects, damage threshold >300 MW/cm² (10 ns Impulse at 1064 nm) only available with side windows |
PGL 0.HP | 30 % |
| extinction ratio <10-7 | PGL 0.7 | 15 % |
| antireflection coating | --- | on request |
| dispersion free side windows | --- | on request |
| connection with Thorlabs SM1 or SM2 thread | --- | on request |
Usable aperture angles
The usable aperture angle of Glan polarizers is limited by the critical angles of the total internal reflection The angle of incidence must be kept in range to achieve total internal reflection of the ordinary beam while the extraordinary beam still passes through. The diagram shows the spectral variation of the angles of incidence on the entrance surface at which the critical angles are reached.
The values are valid for the standard cut angle of 39°. For this angle the field of view is symmetrical at λ=400 nm (|ae|=|ao|). Other cut angles are available on request.
