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Nd:YLF Crystals

Nd:YLF Crystals
Nd:YLF Crystals

Nd:YLF offers an alternative to the more common Nd:YAG host for near IR operation. The combination of weak thermal lensing (19 times lower than that of Nd:YAG), large fluorescence line width and naturally polarized oscillation makes Nd:YLF an excellent material for CW, mode-lock operation, and Q-Switch operation at a moderate repetition rate (~ 1 kHz). The linear polarized beam is ideal for Q-switching and frequency doubling. The 1053 nm output matches the gain profiles of Nd glass and thus it can perform well as an oscillator or pre-amplifier for this Nd glass laser host.

The standard products are cut along a-axis of the crystal. The ends of the crystal are either Brewster angle cut or anti-reflection coated at 1053 nm (or 1047 nm).
 

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Basic Properties:
 

Formula

Nd:LiYF4

Structure symmetry

Tetragonal, I41/a

Lattice constants

a=5.16 Å, b=10.85 Å

Melting point  819oC
Mohs hardness  4 ~ 5
Density  3.99 g/cm3
Thermal conductivity  6.3 W/m/K
Thermal expansion  8.3x10-6 /K (⊥c) ,  13.3x10-6 /K (||c)
Transparency range  180 to 6700 nm
Refractive index (@1053 nm)  no=1.448, ne=1.470
Thermo-Optic Coefficient (dn/dT) -2.0x10-6/K (E⊥c), -4.3x10-6 /K (E||c)
Fluorescent lifetime  485 µs for 1% Nd doping
Peak emission cross section 1.2 x 10-19 /cm2 @ 1053nm
Yong modules 7.65x108 g/cm2
Lasing wavelength 1053 nm (E⊥c, σ,-pol),1047 nm (E||c, π-pol)
Peak absorption wavelength

α =10.8 cm-1 (792.0 nm, E||c)
α =3.59 cm-1  (797.0 nm, E⊥c)

 


Specifications:
 

Diameter tolerance: +0.0/-0.1 mm
Length tolerance: +/-0.5 mm
Wavefront distortion: < λ/4 per inch at 632.8 nm
Surface quality: better than 10/5 Scratch/Dig per MIL-O-1380A
Parallelism: < 10 arc seconds
Perpendicularity: < 5 arc minutes
Surface flatness: < λ/10 at 632.8 nm
Clear aperture: Central 90%
Chamfer: 0.15 mm x 45o

 

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