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Ruby and Alexandrite Lasers (694 nm, 755 nm)

Ruby and alexandrite lasers are especially used for medical laser applications and work at 694 nm and 755 nm, respectively. LAYERTEC offers a wide range of laser optics for both wavelengths with high laser-induced damage thresholds and long lifetimes. Besides typical combinations with wavelengths for the alignment of the optical system (e.g. 694 nm + 633 nm), a special feature of LAYERTEC products is the variety of combinations with other common wavelengths used for medical applications in the same device, but from different laser sources (e.g. 532 nm + 694 nm).
The coatings introduced here are optimized for high LIDT values, but not for extreme spectral bandwidth, GD or GDD. Please add a remark like "for ruby lasers" or "for alexandrite lasers" to your optics inquiry to avoid any mix-up with optics for Ti:Sapphire lasers which may also be specified for 694 nm or 755 nm but which show significantly lower LIDT values.

Cavity Mirrors

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Fig.1:Reflectance spectra of cavity mirrors for:
a)R (0°, 694 nm) > 99.9 %
b)R (0°, 755 nm) > 99.9 %
  • Reflectance: R > 99.8 % … R > 99.9 % at AOI = 0°
LIDT Info
800 MW/cm², 694 nm, 35 ns

Turning Mirrors

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Fig.2:Reflectance spectra of turning mirrors for:
a)Ru (45°, 694 nm) > 99.8 % + Ru (45°, 633 nm) > 95 %
b)Ru (45°, 755 nm) > 99.8 % + Ru (45°, 633 – 650 nm) > 95 %
LIDT Info
800 MW/cm², 694 nm, 35 ns

Beam Combiners

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Fig.3:Reflectance spectra of special beam combiners for 694 nm and 633 nm:
a)PRu (45°, 694 nm) = 99.0 % ±0.3 %+ Ru (45°, 633 nm) < 35 %
b)Ru (45°, 630 – 640 nm) > 35 % + Rp (45°, 694 nm) < 0.3 %
  • Precisely adjusted degree of reflectance by using sputtering technology
  • Easy combination with alignment beam (e.g. at 633 nm)
  • High performance coatings and cost-optimized solutions with special designs

Output Couplers

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Fig.4:Reflectance spectrum of an output coupler for the ruby laser:
PR (0°, 694 nm) = 20 % ±2 %
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Fig.5:Reflectance spectrum of an output coupler for the alexandrite laser: PR (0°, 755 nm) = 85 % ±2 %
  • Output couplers with precisely adjusted degree of reflectance
  • AR coatings for a single wavelength with a residual reflectance of R < 0.2 % on the rear side of output couplers as well as on both sides of lenses and windows made of Fused Silica
Address

LAYERTEC GmbH
Ernst-Abbe-Weg 1
99441 Mellingen
Germany

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