ZnGeP2

ZGP has good optical transparency in the 740 – 12000 nm range and high laser damage threshold, making it ideal for producing near-infrared tunable lasers.

Classification:

Nonlinear Crystals

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Detailed introduction

ZnGeP₂ (zinc germanium phosphide) crystals have many excellent properties and are mid-infrared nonlinear crystals. ZnGeP₂ (ZGP) crystals are approximately 160 times more sensitive than KDP (d36 to 75 pm/V). ZGP has good optical transparency in the 740 – 12000 nm range and high laser damage threshold, making it ideal for producing near-infrared tunable lasers.

PRODUCT FEATURE

Large nonlinearity coefficient The transmission area is 74 um to 12 um High relative damage threshold High thermal conductivity Wide transparent area Phase matching over a wide spectral range

Large nonlinearity coefficient

The transmission area is 74 um to 12 um

High relative damage threshold

High thermal conductivity

Wide transparent area

Phase matching over a wide spectral range

Specifications
Dimension Tolerance	(W±0.1mm)×(H±0.1mm)×(L±0.2mm/0.1mm)
Angle Tolerance	Δθ＜±0.2°；Δφ＜±0.2°
Parallelism	＜30"
Perpendicularity	＜10′
Surface Quality (Scratch/Dig)	20/10 (MIL-PRF-13830B)
Flatness	<λ/8@633nm
Anti-Reflection Coating	According to customer requirements

Chemical and Structural Properties
Crystal Structure	tetragonal , 42m
Lattice Parameter	a=b=5.467Å, c=12.736Å
Melting Point	About 1040°C
Mohs Hardness	5.5
Density	4.17 g/cm³
Thermal Conductivity	35.89 W/mK
Thermal Expansion Coefficients	β‖,5×10^-6/K; β⊥,7.8×10^-6/K

Optical and Nonlinear Optical Properties
Transparency Range	0.74 ∼ 12 um
SHG Phase Matchable Range	3177∼10357nm (Type I)
Absorption Coefficients	α<0.05cm^-1 @2050-2100 nm
Angular Acceptance	30°（2um~12um）
NLO Coefficients	D36=68.9pm/V (at 10.6um) =75.0 pm/V (at 9.6 um)
Non-vanished NLO Susceptibilities	d₃₆=75 ± 8 pm/V
	Type Ⅰ d_eeo=d₃₆sin2θcos2φ
	Type Ⅱ d_oeo=d_eoo=d₃₆sinθsin2φ
Sellmeier Equations (λ in μm)	no2(λ) = 4.64467+5.10087/(λ²-0.13656)+4.27777λ²/(λ²-1653.89)
Sellmeier Equations (λ in μm)	ne2(λ) = 4.71539+5.26358/(λ²-0.14386)+2.37310λ²/(λ²-1000.82)