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  • Cr:LiSAF

  • CASTECH provides high quality, Cr-doped Colquiriite crystal (Cr:LiSAF) using the Czochralski technique. It is excellent laser material with high energy storage and high slope efficiency. It is also ideal working material under conditions of ultra short pulse and ultra high power. Currently, Cr:LiSAF related products such as flashlight pumping and diode pumping laser have been widely used.
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Physical Properties:

Chemical Formula

Cr 3+ :LiSrAlF6

Lattice Parameters

a=5.084Å,c=10.21Å

Crystal structure

trigonal

Cr atoms/cm3 for 1% doping

8.75×1019

Fracture Toughness (Mpam)

0.40(∥c)

Melting Point

766℃

Density

3.45g/cm3

Modulus of Elasticity

109GPa

Thermal Expansion

-10(∥c)

Coefficient (10-6 / K)

25(⊥c)

Thermal Conductivity (W/m/K)

3.3(∥c)

3.0(⊥c)

Specific Heat (J/g·K) (@25℃)

0.842

 

Optical Properties:

Emission Peak

846nm

Peak Stimulated EmissionCross Section

 (×10-20 cm2 )     

4.8(∥c)

Spontaneous Fluorescence  Lifetime

67μs

Scatter Losses

<0.2%/cm

dn/dT(×10-6/ ℃) 

-4.8(∥c)

-2.5(⊥c)

 

The Sellmeier equations (λ in μm):

nc2 =1.98448+0.00235/(λ²-0.010936)-0.01057λ²

na2=1.97673+0.00309/(λ²-0.00935)-0.00828λ²

 

Crystal

Wavelength(nm)

   n 

na

Cr:LiSAF

846

670

423

290

266

   1.407   

1.409

1.413

1.420

1.422

   1.405  

1.407

1.412

1.420

1.424

 

Specifications of Cr:LiSAF:

       •   Size:  Rod sizes from 2mm to 16mm in diameter and from 1mm to 60mm in length;  
       •   Cr dopant concentrations:0.5~1.0 mol%;
       •   Parallelism:<10 ″;  
       •   Perpendicularity:<5 ′;
       •   Chamfer: 0.13±0.07mm ×45°;
       •   Scratch/Dig code: 10/5 to MIL-PRF-13830B;
       •   Flatness: λ/8 @ 632.8nm;
       •   AR coating: R<0.10% @ 850nm.

Large rod and slab dimensions and non-standard dopant concentrations are available upon request.

 

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  • Laser Crystals_Cr-doped Colquiriite (Cr_LiSAF).pdf