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Uncoated Silicon Etalons
Substrate
Material |
Single crystal Silicon |
Surface Quality |
10-5 laser quality |
Transmitted Wavefront |
λ/10 at 633nm |
Diameter Tolerance |
+ 0.00mm, - 0.25mm |
Thickness Tolerance |
T ± 0.002mm |
Wedge |
≤5 seconds |
Chamfer |
0.35mm at 45° typical |
Clear Aperture |
Exceeds central 80% of dimension |
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| Solid silicon etalons are interesting because the high index of silicon (3.4 depending on wavelength) creates a reasonably high finesse without any coatings. The temperature sensitivity of silicon can also be useful (or problematic). |
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Part
No. |
Diameter
(mm) |
Thickness
(mm) |
FSR |
ST025 |
15 |
0.416 |
100GHz |
ST030 |
15 |
0.831 |
50GHz |
ST100 |
15 |
4.15 |
10GHz |
ST150 |
15 |
8.31 |
5GHz |
ST200 |
15 |
16.62 |
2.5GHz |
ST300 |
15 |
41.55 |
1GHz |
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| Note:
Other sizes are available upon request. |
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Uncoated YAG Etalons
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Substrate
Material |
Single YAG crystal |
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Surface Quality |
10-5 laser quality |
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Transmitted Wavefront |
λ/10 at 633nm |
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Diameter Tolerance |
+ 0.00mm, - 0.25mm |
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Thickness Tolerance |
T ± 0.002mm |
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Wedge |
≤1 seconds |
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Chamfer |
0.35mm at 45° typical |
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Clear Aperture |
Exceeds central 80% of dimension |
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Solid YAG etalons are also handy because the high index of YAG material (about 1.8 depending on wavelength). This creates a reasonably high finesse without any coating; this makes yagalons excellent for mode selection in high power solid state lasers. The additional advantage of YAG is excellent transmission in a wide range a wavelengths. |
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Part
No. |
Diameter
(mm) |
Thickness
(mm) |
FSR |
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YT025 |
5 |
1.0 |
82 GHz |
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YT030 |
5 |
0.5 |
164 GHz |
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YT050 |
5 |
0.25 |
330 GHz |
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YT070 |
5 |
0.01 |
820 GHz |
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YT100 |
5 |
0.05 |
1650 GHz |
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YT150 |
5 |
0.025 |
3300 GHz |
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| Note:
Other sizes are available upon request. |
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