ZGP
ZGP, or Zinc Germanium Phosphide, has the formula ZnGeP₂ and a chalcopyrite structure (ABX₂ type) in the tetragonal crystal system. Zn and Ge occupy the A and B sites, respectively, while P occupies the X sites; this ordered arrangement provides excellent nonlinear optical properties. Transmission range:0.7–12 micrometers, with intrinsic absorption near1–2 micrometers that should be avoided. Nonlinear coefficient: high, approximately d₃₆≈75 pm/V, suitable for efficient frequency conversion. Damage threshold: high, approximately1–2 GW/cm², better than crystals such as AgGaS₂ and suitable for high-power laser systems. Thermal conductivity: high, approximately18 W/m·K, enabling good heat dissipation and high-average-power operation. Birefringence: moderate, supporting typeⅠ and typeⅡ phase matching, optimized by angle or temperature tuning. High power handling, broad mid-IR coverage, and excellent thermal management make ZGP a benchmark nonlinear optical product, particularly for demanding industrial and military applications. Although it costs more than materials such as AgGaS₂, its long lifetime (>10⁹ pulses) and low maintenance can significantly reduce lifecycle costs.
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