Our Glan-Thompson Calcite Polarizers provide high purity linear polarization for broadband sources or multiple laser wavelengths for lower power applications. Their 14°-16° acceptance angle allows them to be used in highly converging or diverging beams. The housing mounts into our standard 25.4 mm holders, and the polarizers are offered with broadband AR coatings for the visible and NIR regions.
Wide acceptance angle with superior broadband performance
Extinction ratio >100,000:1
Low wavefront distortion
Best select-grade calcite
S-polarization is transmitted with Ts >90%
P-polarization is rejected and absorbed within the housing
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glan-thompson-calcite-polarizers - Drawings
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Specifications
Diameter
1 in. (25.4 mm)
Material
Optical Grade Calcite
Extinction Ratio
100,000:1
Damage Threshold
1 W/cm2 CW, 0.1 µJ/cm2 with 10 nsec pulses, typical
Surface Quality
20-10 scratch-dig
Clear Aperture
10.0 mm
Diameter Tolerance
±0.25 mm
Transmitted Beam Deviation
<3 arc min
Acceptance Angle
14°–16°, full angle
Wavefront Distortion
≤λ/4 at 632.8 nm over the full aperture
Maximum Temperature
90°C
Features
Glan-Thompson Polarizer Construction
Our Glan-Thompson polarizers are fabricated using two matching select-grade calcite prisms with their hypotenuses cemented to one another to form a rectangular optic. The cemented prism pair is assembled into a black anodized aluminum housing. The housing is marked to indicate the polarization axis of the transmitted beam. The rejected component of the beam is totally internally reflected and eventually absorbed by the anodized aluminum walls of the housing.
How Glan-Thompson Calcite Polarizers Work
Glan-Thompson prisms are formed using two identical calcite prisms with hypotenuses cemented to one another to form a surface that efficiently transmits one polarization state specifically. The prisms have the same optical axis orientation as one another, which is perpendicular to the plane of reflection (the shared hypotenuse). Light that is s-polarized with respect to the reflective hypotenuse experiences the higher ordinary refractive index of calcite. As calcite has a large index difference between extraordinary and ordinary rays, the polarizer has a fairly wide range of acceptance angles that result in transmission of only highly pure s-polarized light. Thus Glan Thompson prisms have a wide usable acceptance angle and are especially well suited for use with diverging and converging beams.
Excellent Optical Properties
Our Glan-Thompson Calcite Polarizers are designed to meet the most demanding applications that require high purity linear polarization. Constructed of optical grade calcite, which features excellent optical properties, including an extinction ratio of greater than 100,000:1, they have a high damage threshold of 1 W/cm2 CW, 0.1 µJ/cm2 with 10 nsec pulses, typical, and precision surface quality of 20-10 scratch-dig. Available uncoated or with AR coatings for the visible and NIR regions, these polarizers transmit S-polarization with Ts>90% and reject P-polarization to be absorbed within the polarizer housing.
Stage Mounting
The Glan-Thompson polarizer has a black anodized aluminum housing. The knurled ring at the center of the housing will unscrew to yield a 1.063-20 thread. This thread conveniently screws into Newport's popular rotation stages such as 481-A
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