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Polarizer
Rochon Polarizers
Rochon polarizer is one of the earliest designs, which
is made of two birefringent material prisms cemented together. Both
ordinary and extraordinary beams propagate collinearly down the optic
axis in the first prism under the ordinary refractive index. Upon
entering the second prism the ordinary beam experiences the same refractive
index and continues undeviated. The extra-ordinary beam, however,
now has a lower refractive index and is refracted at the interface.
The angle of refraction is further increased at the birefringent material/air
exit surface. Any separation angle can be designed for specific wavelength
upon the requirement. The separation angle of standard products vs
wavelength is shown in the plot below.
Separation Angular of Standard Products vs
Wavelength
| |
a -BBO, 190-3500nm |
|
Quartz, 200-3300nm |
| |
YVO4, 400-4000nm |
|
MgF2, 160-1500nm |
| Specifications |
| Material |
a-BBO, Calcite, YVO4,
Quartz |
| Wavelength Range |
a-BBO:190-3500 nm,YVO4:400-4000nm,Quartz:200-2300nm
|
| Extinction Ratio |
Quartz:<5x10 -5 ; a-BBO,
YVO4:<5x10 -6 |
| Parallelism |
<1 arc Min |
 |
| Surface Quality |
20-10 |
| Beam Deviation |
< 3 arc minutes |
| Wavefornt Distortion |
λ/4@633nm |
| Damage Threshold |
>500 MW/cm 2 |
| Coating |
Single MgF2 |
| Mount |
Black Anodized Aluminium |
Standard Products
1. a -BBO Rochon Polarizer
| Part No. |
Extinction Ratio |
Separation Angle(°) |
C.A. f a (mm) |
O.D. f d (mm) |
L±0.1(mm) |
Unit price |
| PRH6006 |
<1x10 -4 |
8.0°-14°
8°@775nm |
6.0 |
15.0 |
14.0 |
$318 |
| PRH6008 |
8.0 |
25.4 |
16.0 |
$372 |
| PRH6010 |
10.0 |
25.4 |
18.0 |
$502 |
| PRH6015 |
15.0 |
30.0 |
23.0 |
$758 |
| PRH6020 |
20.0 |
38.0 |
28.0 |
$1198 |
2. Quartz Rochon Polarizer
| Part No. |
Extinction Ratio |
Separation Angle(°) |
C.A. f a (mm) |
O.D. f d (mm) |
L±0.1(mm) |
Unit price |
| PRH9006 |
<4x10 -6 |
1.0°-1.5°1°@1064nm |
6.0 |
15.0 |
36.0 |
$206 |
| PRH9008 |
8.0 |
25.4 |
46.0 |
$270 |
| PRH9010 |
10.0 |
25.4 |
28.0 |
$349 |
| PRH9015 |
15.0 |
30.0 |
38.0 |
$488 |
| PRH9020 |
20.0 |
38.0 |
48.0 |
$698 |
3. YVO4 Rochon Polarizer
| Part No. |
Extinction Ratio |
Separation Angle(°) |
C.A. f a (mm) |
O.D. f d (mm) |
L±0.1(mm) |
Unit price |
| PRH8006 |
<5x10 -6 |
9.8°-13.0°10°@1050nm |
6.0 |
15.0 |
20.0 |
$259 |
| PRH8008 |
8.0 |
25.4 |
24.0 |
$331 |
| PRH8010 |
10.0 |
25.4 |
28.0 |
$426 |
| PRH8015 |
15.0 |
30.0 |
38.0 |
$568 |
| PRH8020 |
20.0 |
38.0 |
48.0 |
$898 |
4. Mgf2 Rochon Polarizer
| Part No. |
Extinction Ratio |
Separation Angle(°) |
C.A. f a (mm) |
O.D. f d (mm) |
L±0.1(mm) |
Unit price |
| PRH5006 |
<5x10 -4 |
1.0°-2°@980nm |
6.0 |
15.0 |
14.0 |
$230 |
| PRH5008 |
8.0 |
25.4 |
18.0 |
$313 |
| PRH5010 |
10.0 |
25.4 |
18.0 |
$403 |
| PRH5015 |
15.0 |
30.0 |
38.0 |
$568 |
| PRH5020 |
20.0 |
38.0 |
48.0 |
$898 |
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