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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Model	Name	doping	attr_size	Price	Availability	Action
NFW3215-D10-HAR	Nd: YLF laser crystal, Size 3.2x3.2x15mm, A-cut, Nd 1.0% (atm.), S1: HR@1053nm & HT@808nm, S2: AR@1053nm	1.0% Nd	3.2x3.2x15mm	Ask	Out Of Stock
NYF3050-D11-AR	Nd: YLF laser crystal, Dia 3mm x 50mm, Nd 1.1% (atm.), Coating AR@1053nm on both ends	1.1% Nd	Dia 3x50mm	Ask	Out Of Stock
NYF3100-D11-AR	Nd:YLF laser crystal, Dia 3 x 100mm, Nd: 1.1% (atm.), AR coating @ 1053nm on both ends	1.1% Nd	Dia 3x100mm	Ask	Out Of Stock
NYF4020-D09-AR	Nd:YLF laser crystal, Dia 4 x 20mm, Nd: 0.9% (atm.), AR coating @ 1053nm on both ends	0.9% Nd	Dia 4x20mm	Ask	Out Of Stock
NYF4104-D11-AR	Nd:YLF laser crystal, Dia 4 x 104mm, Nd: 1.1% (atm.), AR coating @ 1053nm on both ends	1.1% Nd	Dia 4x104mm	Ask	Out Of Stock
NYF4117-D11-AR	Nd:YLF laser crystal, Dia 4 x 117mm, Nd: 1.1% (atm.), AR coating @ 1053nm on both ends	1.1% Nd	Dia 4x117mm	Ask	Out Of Stock

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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	819^oC
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