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Polarizers for Laser Light, Spectral Polarimetry and
General Light Polarization

Glan-Taylor Polarizers
Glan-Thompson Prism Polarizers
Glan-Taylor Polarizer With Brewster Angled Faces
Glan-Taylor Polarizing Beam Combiner
Wollaston / Rochon Prism Polarizing Beam Splitters

 

Glan-Taylor Calcite Air Spaced Polarizers

Calcite Glan-Taylor polariser in mountThe 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

POLARIZER: GT10 GT12 GT15 GT18 GT20
APERTURE (mm) 10 12 15 18 20
WIDTH (mm) 11 13 17 20 22
HEIGHT (mm) 10 12 15 18 20
LENGTH (± 1.0mm) 11 15 18 21 24
TRANSMISSION RANGE ------------------- 0.25 - 2.5µm -------------------
EXTINCTION RATIO 10-5 10-5 10-5 10-6 10-6
TRANSMISSION UNCOATED ----------------------- 88% -----------------------
MAXIMUM BEAM DEVIATION 3 min 3 min 3 min 2 min 2 min
MAXIMUM OPTICAL POWER PULSED ------------------- 200MW/cm2 --------------------
MAXIMUM OPTICAL POWER CW -------------------- 300W/cm2 ---------------------
Diagram showing beam path through Glan-Taylor polariser

Mounted Glan-Thompson polariser
End View Mounted

 

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

Glan-Taylor polariser with orthogonal side exit anglesIn 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.

Beam path through Glan-Taylor polariser with orthogonal side exit angles

Specifications: Glan Taylor Polarizer with Orthogonal Output Side Exit Escape Windows

Polarizer: GLBS 10 GLBS 12 GLBS 16
Aperture 10 mm 112 mm 15 mm
Spectral Range --------------- 250 - 2500nm ---------------
Extinction Ratio ------------------- > 10-5 -------------------
Maximum Beam Deviation ------------------- 3 min -------------------
Transmission --- 88% (uncoated) 93-95% (ar-coated) ---
Surface Flatness ---------------- l/6 @ NaD ----------------
Maximum Optical Power -- 150W/cm2 (av) - 300MW/cm2 (pulsed) --
Overall Dimensions:
Height 23 mm 25 mm 28 mm
Width 24 mm 27 mm 30 mm
Length 40 mm 48 mm 55 mm

Click here for information on our High Power Attenuators

 

Glan-Taylor Polarizer With Brewster Angled Faces

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 above 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, Leysop are happy to discuss your precise requirements for these and other components so please contact us.

 

Glan-Taylor Polarizing Beam Combiner

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 Polarizers

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.

Diagram of Glan-Thompson polariser Mounted Glan-Thompson polariser
GlanThompson Polarizer End View Mounted

 

Specifications: Glan-Thompson Prism Polarizers

Spectral Range 250 - 2300nm
Extinction Ratio > 105
Beam Deviation < 2.0 min
Transmission Coated 97%
Surface Flatness l/8
Max Power cw 1.0w/cm2

 

Type Clear Aperture
(mm)
Ratio
L/A
Mount
Dia (mm)
Mount
Length (nm)
GTM 10 10 2.5 25 28
GTM 12 12 2.5 25 33
GTM 15 15 2.5 30 40
GTM 20 20 2.5 40 55
GTML 10 10 3.0 25 35
GTML 12 12 3.0 25 40
GTML 15 15 3.0 30 50
GTML 20 20 3.0 40 65

 

Wollaston /  Rochon Prism Polarizing Beam Splitters 

Wollaston Type

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.

Rochon Type

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.

Diagram of Wollaston polariser Diagram of Rochon polariser

Wollaston Type BSW

Rochon Type BSR

Specifications: Wollaston /  Rochon Prism Polarizing Beam Splitters 

Type Aperture
(mm)
Deviation
(deg)
Mount
Dia (mm)
Mount
Length (mm)
BSW 10 20° 25 11
BSW 12 20° 25 13
BSW 15 20° 30 16
BSW 20 20° 40 20
BSR 10 10° 25 11
BSR 12 10° 25 13
BSR 15 10° 30 16
BSR 20 10° 40 20

Both varieties can be made from optically contacted quartz. 
The beam deviation is then 1° but the spectral range is increased to 0.2 - 2.0µm.