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Breakthrough in High Quality LaBGeO5 Crystal for Deep Ultraviolet Quasi-Phase Matching Application
Jiahao Wang1,2, Lingfei Lv1, Rongbing Su1
1State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
None:
Deep ultraviolet (UV) lasers are essential for advanced laser technologies. Currently, only β-BaB2O4 (β-BBO) and CsLiB6O10 (CLBO) are used for nonlinear wavelength conversion in this range, but they face limitations like hygroscopicity and walk-off effects. Thus, alternative materials are needed for efficient frequency conversion. LaBGeO5 crystals, a promising ferroelectric candidate for UV quasi-phase matching (QPM) devices, have been synthesized with well-developed facets. LBGO showcases remarkable properties: an absorption edge at 195 nm, second-harmonic generation intensity of 1.5 × KDP, and a laser-induced damage threshold of about 2.4 GW/cm2 (@1064 nm, 10 ns, 10 Hz), with a transmittance of 78% at 266 nm. Its domain-switching ability arises from the distortion of [BO4] tetrahedrons in [GeB2O9] rings, marking a significant breakthrough in QPM crystal research and promising advancements in UV laser applications.
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