Glan Polarizing Prisms

Glan-Prisms/Drawing(2k)

The prisms are made of calcite which is practically striae- and bubble-free. The prism halves are separated by an air gap of approx. 0.07 mm and are supplied mounted in a holder as standard.
The extinction ratio is a minimum of 10-5 for the undeviated ray. Flatness of the outer surfaces is better than λ/2 (λ = 550 nm). Deformation of a transmitted plane wave is less than λ/2 and prismatic deviation less than about 2'.
The usable spectral range of the standard prisms is 300 to 2700 nm (absorption of the deflected beam occurs above 2 µm). The polarization effect is maintained in a field of view of about 13° to 7.5° but is symmetrical to the normal of the input surface only on one wavelength.
Two types of prisms are manufactured; they differ from one another by the wavelength which has the symmetrical field of view (see diagram below).
1) λsym = 700 nm, field of view ± 4°. At 350 nm and 2 µm the symmetrically usable field of view is ± 3.0°.
2) λsym = 400 nm, field of view ± 4.3°. At 290 nm and 560 nm the symmetrically usable field of view is ± 3.3°.
Due to Fresnel reflection on the inner surfaces there is a light loss of about 5% per inner surface (Type 1, 1064 nm).
Glan prisms are also produced with side exit windows through which the reflected beams exit at angles of approx. 72°. The holders for these prisms have side holes to allow the reflected beams to escape.
The flatness of the side exit surfaces is around 3 λ

Prism Holder Without Side Exit Window
Aperture Length Diameter Length Ordernr. Price 1 pc. Price 2-5 pc. Price 6-10 pc.
  9.5 mm
11.5 mm
14.5 mm
19.5 mm
10 mm
12 mm
15 mm
20 mm
25 mm
25 mm
25 mm
36 mm
22 mm
30 mm
30 mm
30 mm
PGL 10
PGL 12
PGL 15
PGL 20
€ 982
€ 1230
€ 1489
€ 2668
€ 954
€ 1195
€ 1447
€ 2592
€ 935
€ 1171
€ 1418
€ 2496

Prism Holder With Two Side Exit Windows
Aperture Length Diameter Length Ordernr. Price 1 pc. Price 2-5 pc. Price 6-10 pc.
  9.5 mm
11.5 mm
14.5 mm
19.5 mm
10 mm
12 mm
15 mm
20 mm
25 mm
25 mm
25 mm
36 mm
22 mm
30 mm
30 mm
40 mm
PGL 10.2
PGL 12.2
PGL 15.2
PGL 20.2
€ 1340
€ 1588
€ 1864
€ 3097
€ 1302
€ 1543
€ 1811
€ 3008
€ 1276
€ 1512
€ 1775
€ 2897

Usable aperture angles of Glan prismsto top

öffnungswinkel von GlanPrisms

αe and αoare the critical angles for total internal reflection at the inner surface. The transmitted light is polarized when the incidence angle lies between these two limits. All rays with angles of incidence |α| > |αe| are totally reflected at the air gap. All rays (both polarization directions) with |α| > |αo| will be transmitted and be superimposed to the polarized light: the usable acceptance angle of the prism is exceeded.

Please noteto top

For angular orientation these prisms can be mounted in the Rotating Mounts.

Available on special orderto top

  • Antireflection coatings for entrance and exit surfaces → on request
  • Extinction ratio better than 10-6 PGL 0.6 | additional price entfaellt%
  • Interferometer quality PGL 0.1 | € entfaellt (1 pc.), € (2-5 pc.), € (6-10 pc.)
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