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Arminas Butkus +370 5 219 4884
Cr:LiSAF crystals
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Cr:LiSAF crystals

Main features

 

  • Broad absorption and emission bands
  • Nonlinear refractive index is about four times lower than Ti:sapphire
  • Strong ESA and low fracture toughness

 

Application examples

 

  • Femtosecond lasers and CPA laser systems
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  • Description
  • Properties
  • Specifications

The Cr3+:LiSAF gain medium possesses broad emission bands in the near infrared that allow widely tunable laser operation and generation of ~10 fs light pulses via mode-locking. Cr:LiSAF crystals can be grown with a very low loss level of 0.2%/cm, which enables the construction of high-Q-cavities, resulting in lasing thresholds as low as 2 mW and slope efficiencies above 50%. Moreover, the nonlinear refractive index of Cr:LiSAF is about four times lower than Ti:sapphire, which reduces unwanted nonlinearities in ultrashort pulse generation and amplification.

Laser related spectroscopic and thermo-mechanical properties
Absorption peak wavelength 670 nm
Absorption cross-section at peak 5.5×10-20 cm2
Absorption bandwidth at peak wavelength ~100 nm
Laser wavelength 830 (780-920) nm
Lifetime of 4T2 energy level 67 μs
Emission cross-section 5×10-20 cm2
Refractive index 1.41
Crystal structure trigonal
Density 3.45 kg/cm3
Mohs hardness 4
Thermal conductivity 4.6(||a), 5.1 (||c) Wm-1K-1
dn/dT -4.2×10-6 K-1 (n0), -4.6×10-6 K-1 (ne
Thermal expansion coefficient 22×10-6(||a) K-1, 3.6×10-6(||c) K-1
Typical doping level 0.8-1.5 at.%
Cr:LiSAF crystals
Orientation a-cut, other orientations are also available
Clear aperture >90%
Face dimensions tolerance +0/-0,1 mm
Length tolerance ±0,1 mm
Parallelism error <10 arcsec
Perpendicularity error <10 arcmin
Protective chamfers <0,1 mm at 45˚
Surface quality 10-5 S-D
Surface flatness <λ/[email protected],8 nm
Coatings R<1%@670 nm + R<0,5%@700-1100 nm on both faces, custom coatings also available
Laser induced damage threshold >10 J/cm2@1064 nm, 10 ns
Mount Contact us
Order your item
Face dimensions Length End faces Doping Coatings SKU price quantity
5x5 mm
12 mm
Right-angle cut
3%
AR/[email protected] nm + 700-1100 nm
7819
930 €
5x5 mm
12 mm
Brewster cut
3%
uncoated
7820
770 €