Cr:LiSAF - Cr-doped Colquiriite

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Diffusion Bonded Crystals

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) n_c² = 1.98448 + 0.00235 / (λ² - 0.010936) - 0.01057 λ² n_a² = 1.97673 + 0.00309 / (λ² - 0.00935) - 0.00828 λ²

Crystal	Wavelength (nm)	n_c	n_a
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