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Sales engineer
Arminas Butkus +370 5 219 4884
Variable reflectivity mirrors
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Variable reflectivity mirrors

Main features

 

  • Mirror substrates fabricated from high-quality UV grade fused silica glass material
  • Central reflectance from 15% to 35% at 1064 nm wavelength
  • Custom reflectance profiles, substrate material and dimensions are available upon request

 

Application examples

 

  • Laser cavity output coupler for an unstable laser resonator
Request custom
  • Description
  • Specifications

Variable reflectivity mirrors provide circularly symmetric reflectance profile according to the super-Gaussian function

R(r) = R0 exp(-2(r/w0)n)

R0 is the on-axis (peak) reflectance, r - radius, w0 - radius, where the on-axis reflectance is reduced to 1/e2 value, n is the Gaussian order. The higher the order, the steeper are the edges of the Gaussian profile. These mirrors are favorable in high-power unstable laser resonators for their wide filling of the active medium and weak diffraction on hard-edge aperture. Therefore, super-Gaussian variable reflectivity mirors contribute to better near- and far-field beam quality. It is worth to mention that variable reflectivity mirrors can be designed to have various reflectance profiles, such as linear, parabolic, Gaussian.

Variable reflectivity mirrors
Reflectance tolerance ±1%
Clear aperture >85%
Radius w0 2 mm
Gaussian order n 2
Face dimensions tolerance +0/-0,15 mm
Thickness tolerance ±0,25 mm
Parallelism error <30 arcsec
Protective chamfers <0,35 mm at 45°
Surface quality 20-10 S-D (front and rear surface)
Surface flatness <λ/[email protected],8 nm
Rear surface coatings AR(R<0,2%)@1064 nm, AOI = 0°
Laser induced damage threshold >6 J/cm2@1064 nm, 10 ns (for 750-1100 nm mirrors)
Order your item
Material Dimensions Wavelength Central reflectivity Gaussian order SKU price quantity
UVFS
⌀25,4x5 mm
1064 nm
15%
2
6539
Request
UVFS
⌀25,4x5 mm
1064 nm
20%
2
6540
Request
UVFS
⌀25,4x5 mm
1064 nm
25%
2
6541
Request
UVFS
⌀25,4x5 mm
1064 nm
30%
2
6542
Request
UVFS
⌀25,4x5 mm
1064 nm
35%
2
6543
Request