Laser optics & coatings

Laser optics & coatings
Crytur produces a wide range of laser optics and coated optics made on various kinds of substrates as well as on customer-furnished substrates.

Key characteristics

Decades of experience in the field of thin film deposition, modern machines and precise process control before, during and after deposition allows us to offer coatings of the highest performance and quality.

Substrate specifications

Materials:  optical-grade fused silica or BK7 glass
Surface figure:  λ/10 at 633 nm
Wedge:   < 5 minutes of arc
Standard sizes: Ø25.4 × 9.5 mm, Ø25.4 × 6.35 mm
Ø19 × 9.5 mm, Ø12.7 × 6.35 mm

Other substrate materials, sizes, shapes, spherical (convex, concave), parallel (<10 seconds 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:
(at 1064 nm, 10 ns)
30 J/cm2 high reflectivity mirrors
15 J/cm2 AR coatings, partial reflectivity mirrors, graded reflectivity mirrors, beam splitters

Coatings are designed to be used at normal or 45 degree incidence. Other angles of incidence are available upon request.

High reflectivity mirrors

Reflectivity:

> 99.7% VIS, NIR
> 99.5% UV, IR
Central wavelengths: from 250 nm to 6000 nm

Anti-reflection coatings

Working wavelengths:  from 190 nm to 6000 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 or broadband coating

Partial reflectivity mirrors

Designed for any reflection level from 1% to 99% (tolerances ±0.3% to ±3% depending on the reflectivity level) and at any wavelength from 250 nm to 6000 nm with an appropriate AR coating on the second side.

Dichroic mirrors

Mirrors with reflection/transmission levels specified at two (or more) different wavelengths from 250 nm to 6000 nm with an appropriate AR coating on the second side.

Beam splitters

Designed to be used at 45 degree incidence for any reflection level from 1% to 99% (tolerances ±0.3% to ±3% depending on the reflectivity level) at any wavelength from 250 nm to 6000 nm with a specified polarization. Other angles of incidence are available upon request. Appropriate AR coating on the second side.
Rp/Rs ratio is about 0.5 for reflection/transmission level 50%/50% and the angle of incidence 45 degrees.
Dichroic beam splitters are available upon request.

Graded reflectivity laser mirrors

Optical filters and mirrors

Cut-off and bandpass filters, filters for light sources, interference colour filters, and metal and metal-dielectric mirrors are available upon request.

Coated infrared optics

Ge, Si, CaF2, sapphire, and other infrared-material based optics with AR coatings working at wavelengths from 2.5 to 15 μm are available. Other coatings also available upon request. Coatings of customer-furnished substrates are available upon request.