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Quality Improvement of BaGa4Se7 crystal by Annealing in Base Vapor Atmosphere

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SSRN 2024年

作者： Yao, Jiyong Sun, Mengran Shi, Jinlong Chen, Jindong Li, Chunxiao Beijing Center for Crystal Research and Development Key Lab of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Tianjin Key Laboratory of Functional Crystal Materials Institute of Functional Crystal College of Materials Science and Engineering Tianjin University of Technology Tianjin300384 China

Infrared nonlinear optical crystals are widely used in all-solid-state lasers as pivotal devices for laser frequency conversion. BaGa4Se7 (BGSe) crystal has attracted much attention due to its excellent optical properties. However, the presence of point defects in BGSe increases the absorption loss and reduces the laser damage threshold, thus limiting its practical application in high-power mid- and far-infrared lasers. Therefore, it is crucial to reveal the types of defects and their formation mechanisms in BGSe crystal, which is conducive to the design of rational strategies to improve the crystal quality. In this work, the defect activation energies were calculated by photoluminescence (PL) spectroscopy and the existence of three types of defects, OSe, VSe and VBa were verified in the as grown BGSe crystal. Therefore, a thermal annealing process under BaSe vapor was rationally designed to compensate for the loss of Ba and Se elements and to reduce the defect concentration in BGSe. In addition, the changes of defects in BGSe crystal were determined by X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) spectra. All the experimental results confirm that the defect concentration in BGSe decreases greatly and the crystal quality is significantly improved after annealing in BaSe vapor. © 2024, The Authors. All rights reserved.

关键词： Selenium compounds

Growth, Thermal, and Polarized Spectral Characters of Nd3+-Doped Ca3(Bo3)2 crystals

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SSRN 2024年

作者： Yu, Pingzhang Qi, Hongwei Liu, Yanqing Yu, Fapeng Wang, Zhengping School of Chemistry ＆ Chemical Engineering Linyi University Linyi276000 China State Key Laboratory of Crystal Materials Shandong University Jinan250100 China School of Physics and Physical Engineering Shandong Provincial Key Laboratory of Laser Polarization and Information Technology Qufu Normal University Qufu273165 China

We investigated the growth, ions concentrations, powder X-ray diffraction, thermal properties and optical spectroscopy of a Nd3+-doped Ca3(BO3)2 single crystal. The 1.97 at.% Nd3+-doped Ca3(BO3)2 single crystals were grown successfully by Czochralski (Cz) technique. The Na+ ions were added to solve the chemical valence imbalance of Nd3+ and Ca2+ in Ca3(BO3)2 crystals. The ions concentrations of Nd3+, Na+ and Ca2+ in as-grown Nd3+-doped Ca3(BO3)2 single crystals were determined using the method of inductively coupled plasmas atomic emission spectroscopy (ICP-AES), and the concentrations of Nd3+, Na+ and Ca2+ ions were obtained to be 1.97 at% (N0 = 1.55 × 1020 cm−3), 1.94 at% (N0 = 1.52 × 1020 cm−3) and 96.09 at% respectively. The thermal behavior of Nd3+-doped Ca3(BO3)2 single crystals including thermal expansion coefficient, specific heat and thermogravimetric and differential thermal analysis (TG-DTA) were systematically investigated. At room temperature (RT), the polarized absorption spectra, polarized fluorescence spectra and fluorescence decay lifetimes of Nd3+-doped Ca3(BO3)2 crystals were measured. The spectra parameters of Nd3+-doped Ca3(BO3)2 crystals were determined based on the Judd-Ofelt (J-O) theory, including polarized absorption and stimulated emission cross-sections, intensity parameters, transition probabilities, radiative lifetime and branching ratios. All the results show that the Nd3+-doped Ca3(BO3)2 crystals are promising excellent near-infrared laser materials possessing properties of rapid growth, large size, high specific heat, strong emission, and environmental protection. © 2024, The Authors. All rights reserved.

关键词： Calcium compounds

Evolution of Multiple Pulses and Pump Hysteresis Phenomenon in a Passively Mode-Locked Er-Doped Fiber laser Based on an Sb2S3-PVA Saturable Absorber

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SSRN 2023年

作者： Hu, Qiongyu Yang, Kejian Li, Ming Li, Ping Zhao, Haoxu Zhang, Bin Liu, Jing Yang, Yongming Chen, Xiaohan Center for Optics Research and Engineering Key Laboratory of Laser & Infrared System Ministry of Education Shandong University Shandong Qingdao266237 China Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan250100 China School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Shandong Qingdao266237 China

The evolution of multiple pulses and the pump hysteresis phenomenon were observed in a passively mode-locked Er-doped fiber laser using an Sb2S3-PVA saturable absorber. As the pump power was increased, the generations of onefold, twofold, and threefold pulses were meticulously documented. When the pump power was decreased, the evolution of fivefold and sixfold pulses was carefully recorded, accompanied by a clear pump hysteresis phenomenon. A thorough analysis was conducted to examine and reveal the inversely proportional relationship between the RF spectrum modulation periods and the total pulse intervals of the multi-pulse bunches including from onefold to sixfold pulses. © 2023, The Authors. All rights reserved.

关键词： Hysteresis

Photonic Spin-Orbit Coupling Induced by Deep-Subwavelength Structured Light

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arXiv

arXiv 2024年

作者： Zhang, Xin Liu, Guohua Hu, Yanwen Lin, Haolin Zeng, Zepei Zhang, Xiliang Li, Zhen Chen, Zhenqiang Fu, Shenhe Department of Optoelectronic Engineering Jinan University Guangzhou510632 China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou510632 China Guangdong Provincial Engineering Research Center of Crystal and Laser Technology Guangzhou510632 China

We demonstrate both theoretically and experimentally beam-dependent photonic spin-orbit coupling in a two-wave mixing process described by an equivalent of the Pauli equation in quantum mechanics. The considered structured light in the system is comprising a superposition of two orthogonal spin-orbit-coupled states defined as spin up and spin down equivalents. The spin-orbit coupling is manifested by prominent pseudo spin precession as well as spin-transport-induced orbital angular momentum generation in a photonic crystal film of wavelength thickness. The coupling effect is significantly enhanced by using a deep-subwavelength carrier envelope, different from previous studies which depend on materials. The beam-dependent coupling effect can find intriguing applications;for instance, it is used in precisely measuring variation of light with spatial resolution up to 15 nm. © 2024, CC BY.

关键词： Quantum theory

High-power free-running single-longitudinal-mode diamond Raman laser enabled by suppressing parasitic stimulated Brillouin scattering

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High Power laser Science and Engineering 2023年第6期11卷 71-76页

作者： Yuxuan Liu Chengjie Zhu Yuxiang Sun Richard P.Mildren Zhenxu Bai Baitao Zhang Weibiao Chen Dijun Chen Muye Li Xuezong Yang Yan Feng Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghaiChina MQ Photonics Research Centre School of Mathematical and Physical SciencesMacquarie UniversitySydneyAustralia Center for Advanced Laser Technology Hebei University of TechnologyTianjinChina State Key Laboratory of Crystal Materials Shandong UniversityJinanChina

A continuous-wave(CW)single-longitudinal-mode(SLM)Raman laser at 1240 nm with power of up to 20.6 W was demonstrated in a free-running diamond Raman oscillator without any axial-mode selection *** SLM operation was achieved due to the spatial-hole-burning free nature of Raman gain and was maintained at the highest available pump power by suppressing the parasitic stimulated Brillouin scattering(SBS).A folded-cavity design was employed for reducing the perturbing effect of resonances at the pump *** a pump power of 69 W,the maximum Stokes output reached 20.6 W,corresponding to a 30%optical-to-optical conversion efficiency from 1064to 1240 *** result shows that parasitic SBS is the main physical process disturbing the SLM operation of Raman oscillator at higher *** addition,for the first time,the spectral linewidth of a CW SLM diamond Raman laser was resolved using the long-delayed self-heterodyne interferometric method,which is 105 kHz at 20 W.

关键词： delay self-heterodyning diamond Raman laser linewidth single-longitudinal mode stimulated Brillouin scattering

First-Principles Calculations, crystal Growth, and Broadband Near Infrared Luminescence of Nd3+-Doped Y2mg3(Sio4)3 Single crystal

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SSRN 2024年

作者： Li, Lin Zhang, Peixiong Li, Zhen Chen, Zhenqiang Guangdong Provincial Engineering Research Center of Crystal and Laser Technology Guangzhou510632 China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou510630 China College of Physics & Optoelectronic Engineering Jinan University Guangzhou510632 China

This study successfully grew Y2Mg3(SiO4)3 (YMS) single crystals doped with Nd3+ ions via laser Heated Pedestal Growth method for the first time. Based on first-principles calculations, the structural relaxation, energy band structure, density of states and optical properties of YMS and Nd: YMS crystals with multiple disordered structures were calculated for the first time. The refractive index of the YMS crystal was obtained to be 1.82. The optical properties including absorption spectra, Near Infrared (NIR) luminescence spectra and fluorescence lifetime at 1080 nm (Nd3+: 4F3/2→4I11/2) were characterized and analyzed based on the grown Nd: YMS single crystal. The crystal was found to have an ultra-wide half-height width (43.55 nm) of emission cross-section, and a fluorescence lifetime of 220.38 μs, making it a luminescence material with excellent comprehensive performance. © 2024, The Authors. All rights reserved.

关键词： Magnesium compounds

Bridgman Growth and Characterizations Of Nonlinear Optical crystal La 3 Ga 5.5 Nb 0.5 O 14

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SSRN 2024年

作者： Qian, Huiyu Jiang, Linwen Sun, Zhigang Wang, Lirong Liang, Tuanjie Zheng, Yanqing School of Materials Science and Chemical Engineering Ningbo University Ningbo315211 China Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China

La3Ga5.5Nb0.5O14 (LGN) crystal is a promising material for optical parametric chirped-pulse amplification (OPCPA) with high laser damage threshold and wide transmission range which is able to achieve high peak power laser. LGN with a diameter of 25 mm was successfully grown by the vertical Bridgman method for the first time and a series of characterizations were performed. The 1.7 µm absorption peak in transmittance spectra of LGN crystal which was caused by the Czochralski technique can be effectively eliminated by the vertical Bridgman method. LGN crystal possesses a high transmittance of 81.3% in the range of 0.294~7.500 μm. The experimental optical band gap of LGN is 4.16 eV which is positively correlated with laser damage threshold. The experimental laser damage threshold of LGN was determined to 1.416 GW/cm2 by Nb:YAG. The outstanding thermal properties of LGN indicate that it possesses thermal stability in high energy laser field. This work demonstrates that LGN crystal holds great potential for OPCPA applications and the vertical Bridgman method is proved to be a effective and excellent technique to grow large size LGN crystal. © 2024, The Authors. All rights reserved.

关键词： Thermodynamic properties

>10 kW peak power self-frequency doubling laser

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laser Physics Letters 2023年第4期20卷 045001-045001页

作者： Zhao, Chuanrui Yu, Pingzhang Wang, Zhengping Liu, Yanqing Yu, Fapeng Xu, Xinguang State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China School of Physics and Physical Engineering Shandong Provincial Key Laboratory of Laser Polarization and Information Technology Qufu Normal University Qufu 273165 China

A passively Q-switched self-frequency doubling (SFD) green laser based on quasi-continuous diode-pumped and Nd:Ca3TaGa3Si2O14 crystal was developed for the first time with Cr4+:Y3Al5O12 as the saturation absorber. The... 详细信息

A passively Q-switched self-frequency doubling (SFD) green laser based on quasi-continuous diode-pumped and Nd:Ca₃TaGa₃Si₂O₁₄ crystal was developed for the first time with Cr⁴⁺:Y₃Al₅O₁₂ as the saturation absorber. The output wavelength was 533 nm and the maximum average output power was 57 mW, corresponding to single pulse energy, pulse duration, and peak power of 190 μJ, 14.35 ns, and 13.24 kW, respectively. To our knowledge, this is the best result of diode-pumped, pulsed SFD lasers to date. Its compact components and low cost provide a better way to obtain an all-solid-state, miniaturized green laser with high peak power. © 2023 Astro Ltd.

关键词： green laser Nd:CTGS crystal passively Q-switched self-frequency doubling

Normal Dispersion Fiber-based Nonlinear Pulse Compressor for Generating 2-μm Watt-scale, ~100-MHz, Few-cycle laser Pulse

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Normal Dispersion Fiber-based Nonlinear Pulse Compressor for...

Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Tianli Feng Jingcheng Shang Shengzhi Zhao Yizhou Liu Kejian Yang Chun Wang Tao Li School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application China Key Laboratory of Laser & Infrared System (Ministry of Education) Shandong University Qingdao China Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan China

We firstly perform the nonlinear pulse compression for a 2-μm, 101.4-MHz driving laser pulse by splicing normal dispersion fiber (NDF). With the assistance of dispersion compensation of chirped mirror pair, a 28.3-fs (4.2-cycle) compressed pulse, which is 16 times narrower than the 450-fs driving pulse, is realized. The output average power of >1 W creates a new record for the fiber-based nonlinear pulse compressors with such high pulse repetition in the short-mid infrared wavelength region.

关键词： Optical fibers Splicing Power lasers Optical pulse compression Optical fiber communication Compressors Ultrafast optics