Cr:LiSAF Laser Crystal

Cr-doped Colquiriite-Cr:LiSAF
Cr:LiSAF (Chromium-doped Lithium Aluminium Sapphire) laser crystal is a type of solid-state laser mainly used in laser technology. Cr:LiSAF is made by doping chromium (Cr) ions into lithium aluminium sapphire (LiSAF) crystals, and it particularly has the characteristic of generating high-efficiency lasers.
Cr:LiSAF lasers are often used in the field of nonlinear optics and spectroscopy, with various applications such as Raman shift, optical frequency conversion, laser ablation, and optical communication systems.

Physical Properties

Chemical Formula Cr3+:LiSrAlF6
Lattice Parameters (Å) a=5.084, c=10.21
Crystal Structure trigonal
Space Group P31c
Cr atoms/cm3 for 1% doping 8.75 × 1019
Fracture Toughness (Mpam) 0.40( || c)
Melting Point (℃) 766
Density (g/cm3) 3.45
Modulus of Elasticity (GPa) 109
Thermal Expansion -10( || c)
Coefficient (106K) 25(┴c)
Thermal Conductivity (W/m/K) 3.3( || c), 3.0(┴c)
Specific Heat(J/gK) (@25℃) 0.842

Optical Properties

Emission Peak (nm) 846
Peak Stimulated Emission Cross Section (×10-20cm2) 4.8( || c)
Spontaneous Fluorescence Lifetime (µs) 67
Scatter Losses (%/cm) <0.2
dn/dT (×10-6 ℃) -4.8( || c), -2.5(┴c)

The Sellmeier equations (l in mm)

nc2 =1.98448+0.00235/(λ2-0.010936)-0.01057λ2
na2 =1.97673+0.00309/(λ2-0.00935)-0.00828λ2
Crystal Wavelength(nm) nc na
Cr:LiSAF 846 1.407 1.405
Cr:LiSAF 670 1.409 1.407
Cr:LiSAF 670 1.409 1.407
Cr:LiSAF 423 1.413 1.412
Cr:LiSAF 290 1.420 1.420
Cr:LiSAF 266 1.422 1.424

Specifications