Cr:LiSAF Laser Crystal
- Cr-doped Colquiriite-Cr:LiSAF
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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
- Dimensions: Width 2 mm to 16 mm, Length 1 mm to 180 mm
- Cr doping amount: 0.5 to 1.0 mol%
- Parallelism: More than 10 arc seconds
- Perpendicularity: More than 5 arc minutes
- Bevel: 0.13±0.07 mm @45°
- Scratch & Dig: 10/5 to MIL-PRF-13830B
- Flatness: λ/8 @632.8 nm
- R coating: R<0.10% @850 nm