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Beta-Barium Borate (BBO) Crystal

BBO crystal (β-Barium Borate, β-BaB₂O₄), a trigonal non-centrosymmetric nonlinear optical crystal, is renowned for generating 2nd–5th harmonics of Nd:YAG lasers with efficiencies up to 70% (SHG, 532 nm), 60% (THG, 355 nm), 50% (FHG, 266 nm), and a record 200 mW at 213 nm (FFHG). Its superior performance stems from a broad transparency range (189–3500 nm), high nonlinear coefficient (d₁₁ = 2.6 pm/V at 1064 nm→532 nm), low photorefractivity, and non-hygroscopicity, making it critical for UV lithography, laser micromachining, and medical optics.

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Lithium Triborate (LBO) Crystal

LBO Crystal, short for Lithium Triborate Crystal, is a remarkable nonlinear optical crystal. With a chemical formula of LiB₃O₅, it features a wide transparency range from 155 to 3200 nm, allowing interaction with diverse laser sources. It has a high damage threshold, capable of withstanding intense laser beams without performance degradation, which is crucial for high - power laser applications. LBO Crystal also shows excellent optical homogeneity. It's widely used in frequency doubling, tripling of high - peak - power pulsed lasers, and optical parametric oscillators. Its outstanding properties make it an essential component in optical systems like medical lasers, laser displays, and optical data storage.

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Potassium Titanyl Phosphate (KTP) Crystal

KTP Crystal is mostly used as nonlinear crystals for frequency doubling of solid-state Nd:YAG crystal or Nd:YVO4 crystal laser, as it has large nonlinear optical coefficients, wide angular bandwidth and small walk-off angle, broad temperature and spectral bandwidth. KTP crystal also has high electro-optic(E-O) coefficient and low dielectric constant, and large figure of merit, these features make it also widely used in electro-optic application.

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Periodically Poled KTP (PPKTP) Crystal

Periodically Poled Potassium Titanyl Phosphate (PPKTP) crystal is a ferroelectric nonlinear crystal with a unique structure, which aids in efficient frequency conversion through Quasi - Phase - Matching (QPM). The crystal is composed of alternating domains with spontaneous polarization of opposite orientations, enabling QPM to correct the phase mismatch in nonlinear interactions. The crystal is suitable for efficient conversion of any nonlinear process within its transparency range.

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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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Periodically Poled LN (PPLN) Crystal

Periodically Poled LN (PPLN) Crystal is formed by fabricating the nonlinear optical crystal lithium niobate (LN) into a periodically reversed domain structure, based on the quasi - phase matching theory (QPM). This unique structural design enables specific optical properties critical for nonlinear optical applications.

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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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