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Our Glan polarizing prisms are precision-manufactured from high-quality calcite, practically free of striae and bubbles. Light is polarized through total internal reflection of the ordinary-polarized beam at the air gap between the two prisms, providing high extinction and clean polarization.
Glan–Air prisms use an air gap instead of optical cement between the two calcite prisms. This makes them much more resistant to high-power laser light then our Glan Thompson Prisms. If your application involves high-intensity beams, Glan–Air prisms are the safer choice.
The prisms are available with optional side exit windows. In the standard version without side windows, the reflected beam is absorbed at the blackened side surfaces, making this configuration unsuitable for high-intensity light. The version with side windows allows the reflected beam to exit at approximately 72° relative to the incident beam, though the reflected beam exhibits some chromatic dispersion.
By default, Glan polarizers are supplied in a cylindrical mount and without antireflection coating. A range of optional upgrades is available to enhance performance on selected parameters, and multiple options can be combined to meet specific application requirements.
The usable aperture angle of Glan polarizers is limited by the critical angles of total internal reflection. To ensure proper operation, the angle of incidence must be maintained within the allowed range so that the ordinary beam undergoes total internal reflection while the extraordinary beam passes through.
| version | standard | interferometer | UV | high power | high extinction |
| spectral range | 350-2700 nm | 250-2700 nm | |||
| extinction ratio | 10-6 | 10-7 | |||
| wavefront distortion in T (R) | <λ/2 (<2λ) | <λ/10 (<2λ) | |||
| prismatic deviation | <2' | ||||
| air gap | 0,07 mm | ||||
| cut angle | ca. 39° | ||||
| field of view | ±4° | ||||
| damage threshold (10ns, 1064 nm) | not specified | >300MW/cm² |
| format | 10 mm | 12 mm | 15 mm | 20 mm |
| order no. (without side windows) | PGL 10 | PGL 12 | PGL 15 | PGL 20 |
| order no. (with two side windows) | PGL 10.2 | PGL 12.2 | PGL 15.2 | PGL 20.2 |
| clear aperture [mm] | 9.5 | 11.5 | 14.5 | 19.5 |
| mount diameter [mm] | 25 | 25 | 25 | 36 |
| mount length (without side windows) [mm] | 22 | 30 | 30 | 30 |
| mount length (with two side windows) [mm] | 30.5 | 35.7 | 42 | 50 |
For up-to-date prices, please refer to the current price list or request a quote.
| option | order no. | additional price |
|---|---|---|
| interferometer quality wavefront distortion <λ/10 (<2λ in reflection) | PGL 0.I | 30 % |
| UV quality usable wavelength range 250-2700 nm | PGL 0.UV | 20 % |
| 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 |
The usable aperture angle of Glan polarizers is limited by the critical angles of 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.
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