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Lithium Niobate (LiNbO3) Crystal

Lithium Niobate (LiNbO3) is widely used as electro-optic modulator and Q-switch for Nd:YAG, Nd:YLF and Ti:Sapphire lasers as well as modulator for fiber optics, etc. The transverse modulation is mostly employed for LiNbO3 crystal. Also LiNbO3 Crystal is widely used as frequency doublers for wavelength >1um and optical parametric oscillators (OPO) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices.

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Potassium Dihydrogen Dideuterium Phosphate (KDP-KD*P) Crystal

Potassium Dihydrogen Phosphate (KDP, KH₂PO₄) and Potassium Dideuterium Phosphate (KDP, KD₂PO₄) are tetragonal nonlinear optical crystals widely used for second (532 nm, 60% efficiency), third (355 nm), and fourth harmonic generation (266 nm) of Nd:YAG lasers via type I/II phase matching at room temperature, with KDP offering 75% SHG efficiency and higher damage threshold via deuteration. As electro-optic materials, they feature ultra-high coefficients (r₃₃=23.3 pm/V for KDP), low half-wave voltage (~7.6 kV at 1064 nm), and broad bandwidth (>10 GHz), enabling applications in Pockels cells, modulators, and high-power laser systems like inertial confinement fusion, where KDP’s non-hygroscopicity outperforms KDP in harsh environments.

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Chromium Doped Yttrium Aluminum Garnet (Cr4+:YAG) Crystal

Cr⁴⁺:YAG Crystal is a crystal with excellent performance as a passive Q - switch for Nd:YAG, Nd:YLF, Nd:YVO₄, and other neodymium - doped or ytterbium - doped lasers with wavelengths from 0.8 to 1.2μm. With a passive Q - switch or saturable absorber, sufficient laser pulses can be obtained without the need for an electro - optical switch. Due to its good chemical stability, durability, UV resistance, good thermal conductivity, high damage threshold (>500MW/cm²), and ease of handling, it will replace the commonly used LiF and dyes in the field of passive Q - switches and become an excellent choice for 1μm Nd - doped lasers.

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Q-Switch Crystals

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