Nd:YLF Crystal

Neodymium-Doped Yttrium Lithium Fluoride

lower thermal conductivity and a weak negative dn/dT lead to lower thermal distortions

better output beam quality

high UV transparency

Description

Nd:YLF Crystal Neodymium-Doped Yttrium Lithium Fluoride

Descriptions:

Nd:YLF laser crystals using Czochralski technology. Nd3+:YLF crystal is characterized by its long lifetime of 4F3/2 neodymium energy level. Compared to Nd:YAG, the lower thermal conductivity and a weak negative dn/dT lead to lower thermal distortions and allow to achieve a better output beam quality. Another distinctive feature is the high UV transparency, which is favorable for pumping with xenon flash lamps.

Optical properties of Nd:YLF crystal

Transparency Range	180-6700nm
Absorption peak wavelength	792 nm
Peak Absorption Coefficient（for 1.2% Nd）	α= 10.8cm-1 (792.0 nm E∥c) α= 3.59cm-1 (797.0 nm E⊥c)
Absorption bandwidth at peak wavelength	~5 nm
Peak Stimulated Emission Cross Section	1.8×10-19/cm2(E∥c) at 1047nm 1.2×10-19/cm2(E⊥c) at 1053nm
Spontaneous Fluorescence Lifetime	485 µs for 1% Nd doping
Scatter Losses	<0.2%/cm
Laser Wavelength	1047nm (∥c, a-cut crystal) 1053nm(⊥c, a or c-cut crystal)

Physical properties of Nd:YLF crystal

Chemical Formula	LiY 1.0-x Nd x F4
Space Group	I41/a
Nd atoms/cm3	1.40 X 1020 atoms/cm3 for 1% Nd doping
Modulus of Elasticity	85 GPa
Crystal Structure	Tetragonal
Cell Parameters	a=5.16 Å , c=10.85 Å
Melting Point	819℃
Mohs Hardness	4~5
Density	3.99 g/cm3
Thermal Conductivity	0.063 W/cm/K
Specific Heat	0.79 J/g/K
Thermal Expansion Coefficients	8.3×10-6/k∥c 13.3×10-6/ k⊥c
dn/dT	-4,6 × 10-6 (\|\|c) K-1, -6,6 × 10-6 (\|\|a) K-1

NdYLF specifications:

Doping(atm%):	0.01% ~ 3%
Orientation:	A-cut or C-cut
Wavefront Distortion:	λ/8 per inch @ 632.8 nm
Dimension Tolerances：	rods with diameter: +0.0/-0.05 mm , Length: ±0.1 mm
Surface Quality:	10/5 Scratch/Dig MIL-O-1380A
Parallelism:	< 10″
Perpendicularity:	< 5′
Clear Aperture:	> 90%
Surface Flatness:	< λ/10 @ 632.8 nm
Chamfer:	< 0.1 mm @ 45°
Barrel Finish	50-80 micro-inch (RMS) ,
Size	Upon customer request
Coating	AR/HR/PR coating upon customer’s request
Damage Threshold	750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
Quality Warranty Period	One year under proper use