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Laser optics and coatings
Crytur company produces a wide range of laser optics and coated optics made on various kinds of substrates as well as on customer furnished substrates.
Substrate specifications
| Material: | optical grade fused silica or BK7 glass |
| Surface figure: | l/10 at 633 nm |
| Wedge: | < 5 minutes of arc |
| Standard sizes: | f25.4 x 9.5 mm, f25.4 x 6.35 mm, f12.7 x 6.35 mm |
Other sizes, shapes, substrate materials, spherical (convex or concave) substrates with radii of curvature from 50 mm to 20 m, parallel (<10 second of arc) or wedged substrates are available upon request.
Coatings specifications
| Material: | electron beam deposited hard dielectrics Ion Assisted Deposition (IAD) available |
| Clear aperture: | 80 % of diameter. |
| Damage threshold: | 30 J/cm2 at 1.06 mm, 10 ns high reflectivity mirrors 15 J/cm2 at 1.06 mm, 10 ns AR coatings, partial reflectivity mirrors, beam splitters. |
Coatings are designed to be used at normal or 45-degree incidence. Other angles of incidence can be supplied upon request.
High reflectivity mirrors
| Reflectivity: | >99.7 % (VIS, NIR) >99.5 % (UV, IR) |
| Central wavelengths: | from region 250 nm to 3500 nm. |
Anti reflection coatings
| Working wavelengths: | from region 250 nm to 3500 nm. |
| Substrate materials: | fused silica, optical glass, filter glass, float glass, laser crystal elements, etc. |
| Reflectivity: | <0.2 % (V-type coating) <0.5 % (W-type coating or broadband) |
Partial reflectivity mirrors
For any reflection level from 1% to 99% (tolerances +/- 0.3 % to +/- 3 % depending on the reflectivity level) and at any wavelength in the interval from 250 nm to 3500 nm.
Second side: appropriate AR-coating
Dichroic mirrors
Mirrors with reflection/transmission levels specified at two different wavelengths in the interval from 250 nm to 3500 nm.
Second side: appropriate AR-coating
Beam splitters
For any reflection level from 1% to 99% (tolerances +/- 0.3 % to +/- 3 % depending on the reflectivity level) at any wavelength in the interval from 250 nm to 3500 nm and at specified polarization.
Rp/Rs ratio is about 0.5 for reflection/transmission level 50/50 % and angle of incidence 45°.
Standard angle of incidence: 45°
Other angles of incidence available on request.
Second side: appropriate AR-coating
Dichroic beam splitters available upon request.
Graded reflectivity laser mirrors
R(r) = R0 exp (-2(r/w0)N)
| Working wavelength: | 1064 nm |
| Reflectivity profile: | nearly Gaussian or super-Gaussian with specified order N |
| Size of reflecting area w0: | f0.5 to 10 mm (at Ro/e2) typically |
| Central reflectivity R0: | from region 5 % to 80 % (+/-1 % to +/-5% depending on reflectivity level) |
| Residual reflectivity: | < 1/20 of the central reflectivity or <0.5% |
| Second side: | appropriate AR-coating |
Other working wavelengths and reflectivity levels on request.
Optical filters
- cut-off filters
- bandpass filters
- filters for optical curing units
- filters for photodynamic therapy
- metal and dielectric-metal mirrors
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Coated infrared optics
Ge, Si, CaF2, sapphire and other crystal- and infrared material-based optics (windows, mirrors, filters, beam splitters) for wavelengths in the interval from 2.5 to 15 mm.
Coating of customer furnished substrates
available upon request.