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Birefringent Filter Plates
The birefringent filter
plate is a linear retarder made of crystalline quartz and used intracavity
to selectively tune a desired wavelength and create reflection losses at
other wavelengths. In use, it is placed at Brewster’s angle, and then
rotated about the axis perpendicular to the surface to achieve a full wave
retardation at the wavelength of interest. The selected wavelength contains only a p-polarization
component, and thus experience no reflection loss. Other wavelengths undergo a different retardation, and have some amount of s-polarization, leading to reflection losses.
A typical birefringent filter contains a stack of 2–4 quartz plates, each
plate being half the thickness of the previous one. The thickest plate sets
the bandwidth and the thinnest the free spectral rang (FSR).
Standard Birefringent Filter Plates
|
Part No. |
Diameter φ (mm) |
Thickness T(mm) |
In stock |
|
BIR1005 |
φ25.4 |
0.5 |
Email/Call |
|
BIR1010 |
φ25.4 |
1.0 |
Yes |
|
BIR1015 |
φ25.4 |
1.5 |
Email/Call |
|
BIR1020 |
φ25.4 |
2.0 |
Yes |
|
BIR1025 |
φ25.4 |
2.5 |
Yes |
|
BIR1030 |
φ25.4 |
3.0 |
Yes |
|
BIR1040 |
φ25.4 |
4.0 |
Yes |
|
BIR1050 |
φ25.4 |
5.0 |
Yes |
|
BIR0050 |
φ12.7 |
5.0 |
Email/Call |
|
BIR0050-AR1064 |
φ12.7 |
5.0 |
Yes |
|
BIR1060 |
φ25.4 |
6.0 |
Email/Call |
|
BIR1080 |
φ25.4 |
8.0 |
Email/Call |
|
BIR1100 |
φ25.4 |
10.0 |
Email/Call |
Newlight Photonics can produce a wide
variety of custom BIRs for your specific applications. Please
contact us for assistance with your
requirements.
Mount
Anodized aluminum mounts with an outer diameter
(OD) of 1.25" (31.8mm) can be supplied for the 1" BIRs. Metal spacers with
1.0mm thickness and inner diameter (ID) 18mm are also available for stacking BIRs with an air space. Larger BIRs may be mounted in 1.5" (38.1mm)
mounts.
Specifications
|
Cut Orientation: |
a-cut +/-5 arc min with the
optical axis (c-axis) in the plane surface |
|
Diameter Tolerance: |
+0, -0.25 mm |
|
Thickness Tolerance: |
+/-0.05 mm |
|
Surface Quality:
|
10/5 Scratch and Dig
|
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Parallelism: |
< 0.5 arc sec |
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Perpendicularity: |
< 10 arc min |
|
Transmission
Wavefront Distortion: |
< λ/8
@632.8 nm |
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AR-coating:
|
R<0.2% at the central
wavelength is available upon request |
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