Plane parallels, etalons
Plane-parallels, wedge < 10’’
Tolerances | |
Diameter Ø: | +0.0/-0.1 mm |
Thickness t: | ±0.1 mm |
Chamfer: | 0.1–0.3 mm x 45° |
Clear aperture: | > 80% |
Surface imperfection tolerance: acc. to DIN ISO 10110-7 |
Diameter Ø mm | Thickness t mm | Wedge Parallelism | Flatness λ (633 nm) | Surface imp.tol. | UV-FS Article-No. | Stock |
---|---|---|---|---|---|---|
25 | 6.35 | <10″ | λ/10 | 5/3 x 0.040 | S-01015 | ✓ |
50 | 9.5 | <10″ | λ/10 | 5/3 x 0.040 | S-01016 | ✓ |
✓ available from stock
Etalons, wedge < 0.2’’
Tolerances | |
Diameter Ø: | +0.0/-0.1 mm |
Thickness t: | ±20% (< 0.3 mm) |
±5% (≥ 0.3 mm) | |
±0.1mm (≥ 2 mm) | |
Chamfer: | 0.1–0.3 mm x 45° (for t > 0.5 mm) |
Clear aperture: | Ø 20 mm |
Surface imperfection tolerance: acc. to DIN ISO 10110-7 |
Fabry-Perot etalons are extremely narrow line width filters with a series of sharp transmission peaks, separated by the free spectral range (FSR). FSR depends only on the optical thickness of the etalons, whereas the finesse (F) is determined not only by the reflectivity of the coatings, but mainly by surface quality, parallelism, homogeneity of the substrate material and defect-free coatings. Solid etalons can be tuned by tilting and by temperature change.
If a minimum resolvable resolution Δλ is needed, the reflectivity finesse FR can be calculated with
The final finesse of the etalon is in most cases limited by the flatness finesse FF (flatness of λ/20 gives FF = 20) for beam diameter 20 mm. With thinner beams FF can grow to > 200. Pairs of etalons in series may be used to obtain ultra high resolution combined with a very long FSR. The resulting finesse of such a combination can be one order of magnitude higher.
Besides lower costs, solid etalons offer the following advantages over air spaced etalons for intracavity use:
• higher transmission
• lower size
• harder coatings with
• higher damage threshold
Please specify thickness,
center wavelength and reflectivity in your order.
Please contact LASEROPTIK
to discuss your specific requirements.
Diam. Ø mm | Thickn. t mm | Wedge Parallelism | Flatness λ (633 nm) | Surface imp.tol. | Suprasil 311 Article-No. | Stock | FSR nm @ 633 nm | FSR GHz |
---|---|---|---|---|---|---|---|---|
25 | 0.1 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-00209 | ✓ | 1.38 | 1000 |
25 | 0.2 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-00185 | ✓ | 0.69 | 500 |
25 | 0.3 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-00740 | 0.46 | 330 | |
25 | 0.5 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-00353 | ✓ | 0.28 | 200 |
25 | 1 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-01001 | 0.14 | 100 | |
25 | 2 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-00932 | 0.069 | 50 | |
25 | 3 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-00933 | 0.046 | 33 | |
25 | 4 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-00029 | ✓ | 0.034 | 25 |
25 | 5 | <0.2″ | λ/20 in T | 5/3 x 0.040 | S-00206 | 0.028 | 20 | |
25 | 6.35 | <0.2″ | λ/20 | 5/3 x 0.040 | S-00934 | 0.022 | 16 | |
25 | 10 | <0.2″ | λ/20 | 5/3 x 0.040 | S-00754 | ✓ | 0.014 | 10 |
25 | 20 | <0.2″ | λ/20 | 5/3 x 0.040 | S-00495 | 0.007 | 5 |
✓ available from stock