ZGP Nonlinear Crystal
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China
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On FindLight:
since 2019
Description
Zinc Germanium Phosphide (ZnGeP2) is a highly regarded mid-infrared nonlinear crystal known for its exceptional properties. With a tetragonal crystal structure and a chemical formula of ZnGeP2, this crystal exhibits a significant nonlinear susceptibility, approximately 160 times larger than that of KDP (Potassium Dihydrogen Phosphate), with a d36 value of around 75 pm/V. This makes it an ideal choice for applications requiring efficient frequency conversion.
ZnGeP2 is celebrated for its broad optical transparency range, spanning from 0.74 to 12 micrometers. This wide range, combined with a high laser damage threshold, makes it particularly suited for producing near-infrared tunable lasers. The crystal's high thermal conductivity further enhances its performance, ensuring stability and efficiency in various optical applications.
The material's high nonlinear coefficient and phase-matching capabilities over a broad spectral region make it a promising candidate for mid-infrared devices, including second-harmonic generation (SHG), optical parametric oscillators (OPO), and optical parametric amplification (OPA). Its ability to maintain high performance under different conditions solidifies its role as a critical component in advanced optical systems.
ZGP Nonlinear Crystal
Specifications |
|
|---|---|
| Crystal Type: | ZnGeP2 (ZGP) |
| Phase Mathcing Type: | Not Applicable |
| Mounting: | Unmounted |
| Width: | 7 mm |
| Height: | 5 mm |
| Length: | 15 mm |
| Flatness: | <= Lambda/10 |
| Surface Quality (Scratch-Dig): | 20-10 |
| AR Coating: | One side |
| Chemical Formula: | ZnGeP2 |
| Thermal Conductivity: | 180 W/m/K |
| SHG Phase Matchable Range: | 3177 ∼ 10357nm (Type I) |
| NLO Coefficients Type Ⅰ: | deeo=d36 sin2θcos2φ |
| NLO Coefficients Type Ⅱ: | doeo=deoo=d36 sinθsin2φ |
| Damage Threshold At 2.79 Um: | 30 GW/cm2 (150 ps) |
| Damage Threshold At 10.6 Um: | 1 GW/cm2 (2 ns) |
| Transparency Range: | 0.74 – 12 um |
Features
- Chemical Formula: ZnGeP2
- Crystal Structure: Tetragonal, 42m
- Lattice Parameters: a = b = 5.467Å, c = 12.736Å
- Mass Density: 4.16 g/cm3
- Mohs Hardness: 5.5
- Melting Point: About 1040°C
- Thermal Conductivity: 180 W/m/K
- Birefringence: Positive uniaxial
- Thermal Expansion Coefficient: β|| = 5×10-6/K; β⊥ = 7.8×10-6/K
- Phase Matching: Broad spectral region
Applications
- OPA (Optical Parametric Amplification): Utilized for amplifying optical signals in the mid-infrared range.
- SHG (Second-Harmonic Generation): Converts one frequency of light into its second harmonic, effectively doubling the frequency.
- OPO (Optical Parametric Oscillators): Used for generating coherent light across a wide range of frequencies.
- SFG (Sum-Frequency Generation): Combines two input frequencies to produce a new frequency, useful in spectroscopy and laser technology.
Frequently Asked Questions
The experimental values of phase-matching angle are listed in the table provided in the product description.
ZnGeP2 crystal has a large nonlinear coefficient, a wide region of transmission from 0.74 um to 12um, high relative damage threshold, high thermal conductivity, and a wide region of transparency.
The damage threshold of ZnGeP2 crystal is 5 GW/cm2 (10 ns); 10 GW/cm2 (1.3 ns) at 1064nm and 1 GW/cm2 (10 ns); 7 GW/cm2 (250 ps) at 532nm.
The nonlinear susceptibility of ZnGeP2 crystal is approximately 160 times large (d36~75 pm/V) as KDP.
ZnGeP2 crystal is used for producing coherent radiation in the sub-millimeter range, combining frequencies of CO2- and CO-lasers radiation or other lasers that work in the transparency region of ZGP, SHG of CO-laser, second, third, and fourth harmonic generation of CO2 laser, OPO with pumping at wavelengths of 2.05-2.94 μm and possibility to generate effectively 3-10 μm ranges.