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

Turning Mirrors

Beam Combiners

Output Couplers

Cavity Mirrors

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

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

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

Fig.4:Reflectance spectrum of an output coupler for the ruby laser:
PR (0°, 694 nm) = 20 % ±2 %

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

Ruby and Alexandrite Lasers (694 nm, 755 nm)

Cavity Mirrors

Turning Mirrors

Beam Combiners

Output Couplers

Ruby and Alexandrite Lasers (694 nm, 755 nm)