Cr-doped Colquirite/Cr:LiSAF

This family of materials includes LiSAF, LiSGaF and LiCAF. They are excellent laser materials with high energy storage and high slope efficiency. They are also ideal working materials under conditions of ultra short pulse and ultra high power. Currently, Cr:LiSAF related products such as flashlight pumping and semi-conductor pumping laser have been widely used.

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: 8.75x10^19
Fracture Toughness(Mpam): 0.40(//c)
Melting Point :766deg. C
Density(g/ cm³) 3.45
Modulus of Elasticity(GPa): 109
Thermal Expansion Coefficient(10^6K):-10(//c), 25(⊥c)
Thermal Conductivity (W/m/K) 3.3(//c), 3.0(⊥c)
Specific Heat(J/gK)(@25deg.C): 0.842

Optical Properties:

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

The Sellmeier equations(λ in µm):

nc^2 =1.98448 + 0.00235/(L^2 - 0.010936) - 0.01057 L^2
na^2=1.97673 + 0.00309/(L^2 - 0.00935) - 0.00828 L^2

Cr:LiSAF Crystal:
846nm nc=1.407 na=1.405
670nm nc=1.409 na=1.407
423nm nc=1.413 na=1.412
290nm nc=1.420 na=1.420
266nm nc=1.422 na=1.424

Specifications of Cr:LiSAF

Size: Rod sizes from 2mm to 16mm in diameter and from 1mm to 180mm in length
Cr dopant concentrations:0.5~1.0 mol%
Parallelism: <10 arc seconds
Perpendicularity: <5 arc minutes
Chamfer: 0.13±0.07mm @ 45deg.
Scratch/Dig code: 10/5 to MIL-PRF-13830B
Flatness: Lambda/8 @ 632.8nm
AR coating: R<0.10% @ 850nm