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公开(公告)号：US11509111B2
公开(公告)日：2022-11-22
申请号：US16600202
申请日：2019-10-11
申请人： SHANDONG UNIVERSITY
发明人： Haohai Yu , Huaijin Zhang , Jinheng Du , Jiyang Wang
摘要： A kind of all-solid-state high-power slab laser based on phonon band-edge emission, which is comprised of a pumping source, a focusing system, a resonant cavity and a self-frequency-doubling crystal; the said self-frequency-doubling crystal is a Yb-doped RECOB crystal cut into slab shape along the direction of the crystal's maximum effective nonlinear coefficient of its non-principal plane; by changing the cutting direction of the crystal, the phase matching of different wavelengths is realized, thus realizing laser output at the band of 560-600 nm; the said pumping source is a diode laser matrix with a wavelength of 880 nm-980 nm; the input cavity mirror and the output cavity mirror are coated with films to obtain laser output at the band of 560-600 nm; the two large faces of the said self-frequency-doubling crystal is cooled by heat sink and located between the input cavity mirror and the output cavity mirror.
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公开(公告)号：US20230015923A1
公开(公告)日：2023-01-19
申请号：US17953362
申请日：2022-09-27
申请人： Shandong University
发明人： Haohai Yu , Dazhi Lu , Yuzhou Wang , Huaijin Zhang , Jiyang Wang
IPC分类号： G02B1/00
摘要： An effective nonlinear optical coefficient optimization method for langasite group solid solution crystals is disclosed. The langasite group crystal A3BC3D2O14 mainly includes langanite (LGN) crystal, langatate (LGT) crystal and langasite (LGS) crystal. The solid solution crystals are formed by adjusting a component proportion of langasite group crystals with the same structure, so that different ions mix and occupy sites in a polyhedral group, and a polyhedral lattice structure, distortion degree, refractive index and refractive dispersion of the solid solution crystal are changed. The reduction of the phase matching angle and the improvement of the nonlinear optical coefficient are realized, and the effective nonlinear optical coefficient is finally optimized.
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公开(公告)号：US20230091773A1
公开(公告)日：2023-03-23
申请号：US17952365
申请日：2022-09-26
申请人： Shandong University
发明人： Haohai Yu , Huaijin Zhang , Yanfeng Chen , Fei Liang , Cheng He
摘要： A method and a laser for breaking through the limitation of fluorescence spectrum on laser wavelength is disclosed. The method includes: exciting electrons to a high energy level by pump light, and suppressing an oscillation of radiation light by laser cavity coating, using a laser resonance to enhance a transition probability of an electron-phonon coupling from the high energy level to a multi-phonon coupling level, so as to realize the emission and enhancement of breakthrough fluorescence spectrum and realize the radiation light oscillation, wherein the laser cavity includes an incident mirror, a folding mirror, a tuning element and an exit mirror arranged in sequence along an optical path direction, the laser gain medium is located between an incident mirror and a folding mirror in the laser resonator, and the tuning element is arranged in the laser cavity at a Brewster angle.
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公开(公告)号：US10809594B2
公开(公告)日：2020-10-20
申请号：US16843204
申请日：2020-04-08
申请人： SHANDONG UNIVERSITY
发明人： Haohai Yu , Huaijin Zhang
摘要： A visible-to-ultraviolet band optical frequency converter. The processing period of a nonlinear optical crystal is controlled to provide an additional period phase to meet a phase matching condition so as to realize effective optical frequency conversion. The additional period phase is characterized in that phase gratings periodically arranged according to different refractive indexes are formed in the crystal through technologies, including laser micro-processing, ion etching and the like, a nonlinear frequency conversion inverse process is avoided through the periodic structure damage of the crystals in the phase gratings and an additional period phase is provided, phase mismatch caused by the insufficient double refraction of the nonlinear optical crystal is avoided, and efficient frequency doubling or sum frequency output is realized.
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