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Glan Polarizers

Optics, filters & coatings

Glan Polarizers

Glan polarizers made from select-grade calcite prism pairs with the interface angles optimised for minimum insertion loss, assembled air-spaced. Glan-laser polarizers have two escape windows that let the rejected beam leave the polarizer, and are normally used in Q-switched laser cavities and other multiple-pass applications. Glan-Taylor and Glan-Thompson polarizers are also available.

Glan-Taylor polarizer

ParameterValue
Materiala-BBO, Calcite, YVO4
Wavelength Rangea-BBO: 220-3000nm; Calcite: 350-2300nm; YVO4: 500-4000nm
Extinction Ratio<5×10⁻⁶
Surface Quality20/10 scratch and dig
Beam Deviation< 3 arc minutes
Wavefront Distortionλ/4@632.8nm
Damage Threshold> 10 MW/cm²
CoatingSingle Layer MgF2@1064nm
MountBlack Anodized

Glan-Laser polarizer

ParameterValue
Materiala-BBO, Calcite, YVO4
Wavelength Rangea-BBO: 220-3000nm; Calcite: 350-2300nm; YVO4: 500-4000nm
Extinction Ratio<5×10⁻⁶
Surface Quality20/10 scratch and dig
Beam Deviation< 3 arc minutes
Wavefront Distortionλ/4@632.8nm
Damage Threshold>500MW/cm²
CoatingSingle Layer MgF2@1064nm
MountBlack Anodized

Glan-Thompson polarizer

ParameterValue
MaterialCalcite
Wavelength Range400-2300nm
Extinction Ratio<5×10⁻⁶
Surface Quality20/10 scratch and dig
Beam Deviation< 3 arc minutes
Wavefront Distortionλ/4@632.8nm
Damage Threshold> 10MW/cm²
CoatingSingle Layer MgF2@1064nm
MountBlack Anodized Aluminum

Technical FAQ

Configuration questions for Glan Polarizers

What wavelengths does the Glan Polarizers cover?

Wavelength Range: a-BBO: 220-3000nm; Calcite: 350-2300nm; YVO4: 500-4000nm. Check the specification at your angle of incidence. Coating bands and grating efficiency curves are quoted at a reference angle, and both shift as that angle changes.

How much optical power can the Glan Polarizers take?

Damage Threshold: > 10 MW/cm². Damage thresholds are quoted for a pulse duration, wavelength and beam diameter. Scale them to your own conditions rather than reading the headline figure as a rating.

What is the Glan Polarizers made from?

Material: a-BBO, Calcite, YVO4 · Surface Quality: 20/10 scratch and dig. Substrate and coating decide thermal behaviour and cleaning method as much as optical performance. Confirm both before the optic enters a high-average-power or vacuum path.