Solid etalon
The author : time : 2016-06-14 Click on the number of times : 368
Solid etalon
Uncoated Silicon Etalons
| Substrate Material | Single crystal Silicon | | Surface Quality | 40-20 laser quality | | Transmitted Wavefront | λ/10 at 633nm | | Diameter Tolerance | + 0.00mm, - 0.25mm | | Thickness Tolerance | T ± 0.001mm | | Wedge | ≤1 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 | 4.155 | 10GHz | | ST150 | 15 | 8.311 | 5GHz | | ST200 | 15 | 16.622 | 2.5GHz | | ST300 | 15 | 41.555 | 1GHz |
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| Note: Other sizes are available upon request. |
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Uncoated Germanium Etalons
| Substrate Material | Single Ge crystal | | Surface Quality | 60-40 laser quality | | Transmitted Wavefront | λ/10 at 633nm | | Diameter Tolerance | + 0.00mm, - 0.25mm | | Thickness Tolerance | T ± 0.001mm | | Wedge | ≤1 seconds | | Chamfer | 0.35mm at 45° typical | | Clear Aperture | Exceeds central 80% of dimension |
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| Solid Germanium etalons have a high index (~4.0 depending on wavelength) that creates a reasonably high finesse without any coatings. They also remain transmissive farther out into the infrared that silicon etalons, the germanium etalon will still provide a decent signal at a wavelength of 14um. The temperature sensitivity of germanium is similar to silicon can also be useful (or problematic). These etalons are often used to monitor the wavelengths of long wave lasers. |
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| Part No. | Diameter (mm) | Thickness (mm) | FSR | | GE025 | 15 | 25.4 | 1.46 GHz | | GE030 | 15 | 38 | 0.98 GHz | | GE050 | 15 | 50.8 | 0.73 GHz |
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| Note: Other sizes are available upon request. |
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Uncoated Zinc Selenide Etalons
| Substrate Material | CVD ZnSe crystal | | Surface Quality | 40-20 laser quality | | Transmitted Wavefront | λ/10 at 633nm | | Diameter Tolerance | + 0.00mm, - 0.25mm | | Thickness Tolerance | T ± 0.005mm | | Wedge | ≤2.5 seconds | | Chamfer | 0.35mm at 45° typical | | Clear Aperture | Exceeds central 80% of dimension |
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| Zinc Selenide etalons have a reasonably high index (~2.5 depending on wavelength) that creates a reasonably high finesse without any coatings. They also remain transmissive over a very broad wavelength range from 600nm to 20um. | |
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| Part No. | Diameter (mm) | Thickness (mm) | Wavelength range | | ZE025 | 15 | 0.5 | 0.6-20um | | ZE030 | 15 | 1.0 | 0.6-20um | | ZE050 | 15 | 2.0 | 0.6-20um |
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| Note: Other sizes are available upon request. |
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