Glan-Taylor Polarizers Calcite Air Spaced Polarizers
The Glan-Taylor polarizer produces a high extinction ratio polarizer with low reflection losses and a high power handling capability. It is therefore particularly useful for polarizing laser light, with the further advantages that there is no transmission deviation or offset, and that a wide spectral range can be polarized. They come un-mounted or in the optional mount pictured to the right.
Specifications: Glan-Taylor Calcite Air Spaced Polarizers
|Transmission range||0.25 - 2.5µm||0.25 - 2.5µm||0.25 - 2.5µm||0.25 - 2.5µm||0.25 - 2.5µm|
|Maximum Beam Deviation||3 min||3 min||3 min||2 min||2 min|
|Maximum Optical Power Pulsed||200MW/cm2||200MW/cm2||200MW/cm2||200MW/cm2||200MW/cm2|
|Maximum Optical Power CW||300W/cm2||300W/cm2||300W/cm2||300W/cm2||300W/cm2|
LEYSOP supplies GT model Glan-Taylor polarizers with apertures from 10-20mm and larger by special order. Side faces are fine ground, which is adequate to disperse the internally reflected polarization state. Polished side exit faces are provided if required. The interface angle makes the polarizer suitable for operation across the transmission range of 0.25 – 2.5µm. Other interface angles can be ordered to cover the full transmission range of calcite from 0.2 – 2.5µm. The optical surfaces are polished to a flatness of λ/4 at 0.63µm.
Glan Taylor Polarizer
With Orthogonal Output Side Exit Escape Windows
In this novel Glan Taylor polarizer design two side exit windows give orthogonal output escape beams and the mechanical mount gives a high degree of protection to all four optical surfaces. They come un-mounted or in the optional mount pictured to the right.
Specifications: Glan Taylor Polarizer with Orthogonal Output Side Exit Escape Windows
|Polarizer||GLBS 10||GLBS 12||GLBS16|
|Aperture||10 mm||112 mm||15 mm|
|Maximum Beam Deviation||3 min||3 min||3 min|
|Surface Flatness||l/6 @ NaD||l/6 @ NaD||l/6 @ NaD|
|Maximum Optical Power||150W/cm2 (av) - 300MW/cm2 (pulsed)||150W/cm2 (av) - 300MW/cm2 (pulsed)||150W/cm2 (av) - 300MW/cm2 (pulsed)|
|Height||23 mm||25 mm||28 mm|
|Width||24 mm||27 mm||30 mm|
|Length||40 mm||48 mm||55 mm|
This special version of the Glan-Taylor polarizer is cut such that the P-polarization (extra-ordinary ray) intersects all four optical faces at Brewster’s angle, thus ensuring a minimal insertion loss over a wide operating wavelength range. Transmission in fact is approaching 99% for the P-polarization and extinction ratio is exceptional, exceeding that of the more conventional cut Glan-Taylor.
One disadvantage of the Brewster cut Glan-Taylor polarizer, as you can see from the diagram, is that it produces a reasonably large offset in the beam line. This is typically around 5 to 7mm depending on the size of the device and because of the refraction at the Brewster interfaces, it is also wavelength dependent.
Nominally available apertures are 8, 10 or 12mm and the polarizer can be supplied in a mount if required. As always, we are happy to discuss your precise requirements for these and other components so please contact us.
This special version of the Glan-Taylor polarizer is cut such that the rejected S-polarized light exits in a direction parallel to the side exit face normal. More importantly, if the beam direction is reversed such that light is entering at the side face, it suffers no refraction at the surface and hence there is no dispersion of the position of the beam in the polarizer. This makes it possible to use this design for combining beams of orthogonal polarization and across a range of wavelengths without losing colinearity of the combined beams.
A range of sizes comparable to our conventional Glan-Taylor polarizers is available but as the prism sizes are larger, there is a modest premium on the price for a given aperture. Please contact us for further information.
Glan-Thompson cemented prism polarizers of calcite give the largest aperture field angle product of all calcite polarizer designs and the lowest transmission losses. The cemented interface, however, prevents their use with high power lasers. Applications include spectral polarimetry and general light polarization and analysis investigations.
In the standard form the length aperture ratio of L/A = 2.5 gives a useable angular polarized field symmetrical about the prism axis of greater than 14° while the long form L/A = achieves over 25°. They come un-mounted or in the optional mount pictured to the right.
Max Power cw
|Mount Dia |
Wollaston prism polarizing beam splitters consist of two equal angle calcite prisms optically coupled with optic axis orthogonally crossed to the direction of propagation. The beam separation of about 20° is then approximately balanced about the input beam axis. The transmission range for cemented prisms of 0.32 to 2.5µm to 18° at 2.5µm. They come un-mounted or in the optional mount pictured to the right.
In this arrangement one polarization state is transmitted undeviated through the prism while the orthogonal component is deviated approximately 10°. The straight through component is clearly chromatic while the deviated beam varies from 11° at 0.32µm to 8.5° at 2.5µm.
|Mount Dia |
Both varieties can be made from optically contracted quartz. The beam deviation is then 1° but the spectral range is increased to 0.2 – 2.0 µm.
AR coatings on all input and output faces
Angle of incidence
Single wavelength partial reflectance on hypotenuse face
T/R= 50/50, 30/70, 40/60,T=(Ts+Tp)/2,R=(Rs+Rp)/2
T/R – Transmission/Reflection
|T/R||Size: 25.4*25.4*25.4 mm||Size: 12.7*12.7*12.7 mm|
|400 - 700||50/50±5%||EOC-VIS-50-01||EOC-VIS-50-02|
|650 - 900||EOC-650-900-50-01||EOC-650-900-50-02|
|900 - 1200||EOC-900-1200-50-01||EOC-900-1200-50-02|
|1200 - 1600||EOC-1200-1600-50-01||EOC-1200-1600-50-02|