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Cr:LiSAF - Cr-doped Colquiriite

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Cr:LiSAF - Cr-doped Colquiriite
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  • Cr:LiSAF - Cr-doped Colquiriite

  • CASTECH provides high quality, Cr-doped Colquiriite crystal (Cr:LiSAF) using the Czochralski technique. It is an excellent laser material with high energy storage and high slope efficiency.
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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.

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