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Home >> Products >> Laser Components >> Nonlinear Crystals >> ZGP

ZGP (ZnGeP2) crystals

Zinc germanium phosphide (ZnGeP₂) is an excellent mid-IR nonlinear crystal with many outstanding fundamental properties. ZnGeP2 (ZGP) crystal has large nonlinear susceptibility (d36~75 pm/V), which is approximately 160 times that of KDP. ZGP exhibits good optical transparency over the 0.74–12 um wavelength region and relatively high laser damage threshold, and is therefore well suited for producing tunable laser output in the near infrared. ZGP is a very promising material for applications such as SHG, SFG, OPO, and OPG/OPA in the mid-infrared region.

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Modules or Types
Features
Specifications
Basic Properties

Chemical and Physical Properties
Chemical formula	ZnGeP2
Crystal structure	Tetragonal, 42m
Lattice parameter	a=b=5.467Å, c=12.736Å
Mass density	4.16 g/cm³
Moh hardness	5.5
Melting point	About 1040°C
Thermal conductivity	180 W/m/K
Thermal expansion coefficient	β‖,5x10^-6/K; β⊥,7.8x10^-6/K
Birefringence	positive uniaxial

Linear Optical Properties
Transparency range	0.74 - 12 um
Absorption coefficient:	α<0.05cm^-1 @2050-2100 nm
Refractive Indices @ 2.05 um @ 2.79 um @ 5.30 um @ 10.6 um	no = 3.1478, ne = 3.1891 no = 3.1333, ne = 3.1744 no = 3.1136, ne = 3.1547 no = 3.0729, ne = 3.1143
Sellmeier Equations(λ in μm)	n_o²(λ) = 4.64467+5.10087/(λ²-0.13656)+4.27777λ²/(λ²-1653.89) n_e²(λ) = 4.71539+5.26358/(λ²-0.14386)+2.37310λ²/(λ²-1000.82)

Nonlinear Optical Properties
SHG Phase Matchable	3177 ∼ 10357nm (Type I)
NLO coefficients	d₃₆=75 ± 8 pm/V Type Ⅰ d_eeo=d₃₆sin2ϴcos2φ Type Ⅱ d_oeo=d_eoo=d₃₆sinϴsin2φ
Damage Threshold at 2.79 um at 10.6 um	30 GW/cm² (150 ps) 1 GW/cm² (2 ns)

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Related products

BBO

KTP

HGTR KTP

DKDP (KD*P)

Modules	Crystal dimension/mm	Application	Orientation Theta/Phi deg	Coatings
SHZGP-7515-54	7x5x15	OPO @ 2.1-> 3.5-5 µm	54/0	AR@2.1µm+BBAR@3.5-5µm
SHZGP-7520-54	7x5x20	OPO @ 2.1-> 3.5-5 µm	54/0	AR@2.1µm+BBAR@3.5-5µm
SHZGP-7525-54	7x5x25	OPO @ 2.1-> 3.5-5 µm	54/0	AR@2.1µm+BBAR@3.5-5µm

Specifications of ZGP crystals
Materials	ZnGeP2 crystals
Thickness/Diameter Tolerance	+/-0.05mm
Orientation Tolerance	<0.5°
Flatness	less than λ/8 @ 633nm
Transmitting wavefront distortion	less than λ/4 @ 633nm
Chamfer	≤0.2mmx45°
Chip	≤0.1mm
Surface Quality	better than 10/5 S/D (MIL-PRF-13830B)
Parallelism	≤30 arc seconds
Perpendicularity	≤15 arc minutes
Aperture	>90%

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ZGP (ZnGeP2) crystals

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