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![[ Castech ]<Br>Cr:LiSAF<br>Laser Crystal](/thum_img/mjct/goods_img3/02711d3c8c59f7e9e94c3cc74857105f_water_4de0b559c44a49f5f544fca08f3bc282_c0_w500_h500.jpg)
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Introduction
CASTECH provides high quality, Cr-doped Colquiriite crystal (Cr:LiSAF, Cr3+:LiSrAlF6) using the Czochralski technique. It is an excellent laser material with high energy storage and high slope efficiency. It is also an 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.
Table 1. Basic properties
|
Chemical Formula |
Cr3+: LiSrAlF6 |
|
Crystal Structure |
Trigonal |
|
Point Group |
P31c |
|
Lattice Parameter |
a = 5.084 Å, c = 10.21 Å |
|
Cr atoms/cm3 for 1% doping |
8.75 × 1019 |
|
Fracture Toughness (Mpam) |
0.40 (∥c) |
|
Melting Point |
766 ℃ |
|
Density |
3.45 g/cm3 |
|
Modulus of Elasticity |
109 GPa |
|
Thermal Expansion Coefficients |
-10 × 10-6 /K (∥c)25 × 10-6 /K (⊥c) |
|
Thermal Conductivity |
3.3 W/m/K (∥c)3.0 W/m/K (⊥c) |
|
Specific Heat |
0.842 J/g·K @25 ℃ |
Table 2. Optical Properties
|
Emission Peak |
846 nm |
|
Peak Stimulated Emission Cross Section |
4.8 ×10-20 /cm2(∥c) |
|
Fluorescence Lifetime |
67 µs |
|
Scatter Losses |
< 0.2%/cm |
|
dn/dT |
-4.8×10-6 /℃ (∥c) -2.5×10-6 /℃ (⊥c) |
|
Sellmeier Equations (λ in µm) nc2 = 1.98448 + 0.00235 / (λ² - 0.010936) - 0.01057 λ² na2 = 1.97673 + 0.00309 / (λ² - 0.00935) - 0.00828 λ² |
|
|
Crystal |
Wavelength (nm) |
nc |
na |
|
Cr3+:LiSAF6 |
846 |
1.407 |
1.405 |
|
670 |
1.409 |
1.407 |
|
|
423 |
1.413 |
1.412 |
|
|
290 |
1.420 |
1.420 |
|
|
266 |
1.422 |
1.424 |
Specifications of Cr3+:LiSAF6 crystal from CASTECH
Table 3. Specifications
|
Dopant Concentration |
Cr: 0.5~1.0 mol % atm% |
|
Size |
Rod sizes from 2 mm to 16 mm in diameter and from 1 mm to 60 mm in length |
|
Surface Quality (Scratch/Dig) |
10/5 to MIL-PRF-13830B |
|
Parallelism |
20 arc sec |
|
Flatness |
λ/8 @633 nm |
|
Perpendicularity |
≦ 15 arc min |
|
Chamfer |
≦ 0.2 mm x 45 ° |
|
AR-coated |
R<0.10% @850 nm |
Large rod and slab dimensions and non-standard dopant concentrations are available upon request.
