We report efficient power scaling of the laser output with an adaptive bemn profile from an Nd：YAG dual-cavity master oscillator using a three-stage end-pumped Nd：YVO4 amplifier. We succeed ill the last switching of...We report efficient power scaling of the laser output with an adaptive bemn profile from an Nd：YAG dual-cavity master oscillator using a three-stage end-pumped Nd：YVO4 amplifier. We succeed ill the last switching of an excited laser mode by modulating an acousto-optic modulator loss in a dual-cavity master oscillator, thereby achieving temporal modulation of the output beam profile. The outputs from the master oscillator are amplified via a three-stage power amplifier yielding 36.6, 40.5, and 45.4 W of the maximum output at 116.8 W of incident pump power for the transverse electromagnetic, Laguerre-Gaussian, and quasi-top-hat beam, respectively. The prospects for further power scaling and applications via the dual-cavity master-oscillator power-amplifier （MOPA） system are considered.展开更多
We demonstrate a high power,Er:Lu AG single-longitudinal-mode laser in an anti-misaligned resonator.Based on the Faraday effect,a 1.61 W single-longitudinal-mode(SLM)laser is obtained with the double corner-cube-retro...We demonstrate a high power,Er:Lu AG single-longitudinal-mode laser in an anti-misaligned resonator.Based on the Faraday effect,a 1.61 W single-longitudinal-mode(SLM)laser is obtained with the double corner-cube-retroreflector(CCR)structure,and the tunable wavelength is 1649.2-1650.3 nm.Additionally,we investigate the anti-misalignment characteristics when the CCR moves and rotates along the optical axis.Furthermore,by utilizing the Er:Lu AG amplifier,the maximum 2.32 W single-longitudinal-mode laser at 1649.6 nm is achieved.The beam quality factors M^(2) of the 2.32 W Er:Lu AG single-longitudinal-mode laser are 1.23 and 1.25 along the horizontal(x)and vertical(y)directions,respectively.展开更多
We demonstrate, for the first time, to the best of our knowledge, an all-fiber figure-of-9 double-clad Tm-doped fiber laser operating in the dissipative soliton resonance(DSR) regime. Stable mode-locked rectangular pu...We demonstrate, for the first time, to the best of our knowledge, an all-fiber figure-of-9 double-clad Tm-doped fiber laser operating in the dissipative soliton resonance(DSR) regime. Stable mode-locked rectangular pulses are obtained by using the nonlinear amplifying loop mirror(NALM) technique. A long spool of high-nonlinearity fiber(HNLF) and a segment of SMF-28 fiber are used to enhance the nonlinearity of the NALM loop and to obtain a large all-anomalous regime. Output power and pulse energy are further boosted by using a three-stage master oscillator power amplifier(MOPA) system. At the maximum pump power, average output power of up to 104.3 W with record pulse energy of 0.33 mJ is achieved with a 2 μm DSR-based MOPA system.展开更多
固体MOPA(Master oscillator power amplifier)激光器是一种通过将固体激光器的主振荡器与功率放大器组合,放大低功率信号以输出高功率激光的装置,在激光加工、精密测量、医疗治疗和科学研究等领域有着广泛应用。光束质量作为激光器输...固体MOPA(Master oscillator power amplifier)激光器是一种通过将固体激光器的主振荡器与功率放大器组合,放大低功率信号以输出高功率激光的装置,在激光加工、精密测量、医疗治疗和科学研究等领域有着广泛应用。光束质量作为激光器输出性能的关键指标,直接决定了激光器在这些应用中的效果和精度。但由于固体MOPA激光器中热效应的存在,激光输出过程中常伴随着光束质量的持续恶化,导致性能降低,因此优化光束质量便成为激光器性能提升的关键,在激光器的设计与应用中具有重要的研究与实践意义。本文综述了固体MOPA激光器光束质量优化技术的研究进展,重点介绍了热效应抑制技术、负透镜法、相位共轭法、可变形镜法、球差自补偿法、增益导引法和光束整形法等优化方法。通过分析这些技术的原理、实验进展及应用效果,讨论了它们在提高光束质量方面的挑战和创新成果。此外,文章还指出了固体MOPA激光器在高功率、高效率条件下光束质量优化的难点,并展望了未来可能的研究方向和技术突破。展开更多
激光直接零部件标识(Laser Direct Part Marking)技术是一种在工业环境中证实可行,可实现高度自动化且绿色环保的标识技术,已经成为工业产品追溯中产品标识的首选手段。本文基于控制灵活、激光参数调节范围更大的MOPA(MOPA,主控振荡器...激光直接零部件标识(Laser Direct Part Marking)技术是一种在工业环境中证实可行,可实现高度自动化且绿色环保的标识技术,已经成为工业产品追溯中产品标识的首选手段。本文基于控制灵活、激光参数调节范围更大的MOPA(MOPA,主控振荡器的功率放大器)激光标识设备,按照ISO/IEC TR 29158条码技术标准,开展激光加工参数(如激光峰值功率、激光单脉冲能量、激光功率、填充间隔、扫描速度等)对激光直接标识(Direct Marking,DM)码质量(如条码等级、对比度、打印伸缩等)影响的研究。通过优化激光加工参数,实现了在AL2024材料表面标识高质量DM码的激光标识工艺。展开更多
为了研制激光干涉成像所需的基于主振荡功率放大（Master Oscillator Power Amplifier,MOPA）结构的高能高相干脉冲单频激光器,需要研究经过功率放大后的脉冲时间相干性随激光功率（或能量）增加的变化趋势。本文采用声光调Q脉冲单频Nd...为了研制激光干涉成像所需的基于主振荡功率放大（Master Oscillator Power Amplifier,MOPA）结构的高能高相干脉冲单频激光器,需要研究经过功率放大后的脉冲时间相干性随激光功率（或能量）增加的变化趋势。本文采用声光调Q脉冲单频Nd：YVO_4激光器作为种子源,利用Nd：YAG功率放大模块对种子源激光进行2.1倍的脉冲能量放大。利用迈氏干涉测量法,完成种子源和2.1倍功放后激光在0～6 m光程差下干涉条纹对比度的实验测量,从而初步得到脉冲激光时间相干性（线宽）随激光功率（或能量）增加的变化趋势。同时也完成种子源和功放后激光的单频性、单脉冲能量、脉宽和峰值功率等基本参数的实验测量。展开更多
基金supported by the National Research Foundation of Korea(NRF)(No.501100003725)the Basic Science Research Program(No.NRF-2014R1A1A2A16053885)+1 种基金the Korean National Police Agency(No.501100003600)the Projects for Research and Development of Police science and Technology(No.Pa-B000001)
文摘We report efficient power scaling of the laser output with an adaptive bemn profile from an Nd：YAG dual-cavity master oscillator using a three-stage end-pumped Nd：YVO4 amplifier. We succeed ill the last switching of an excited laser mode by modulating an acousto-optic modulator loss in a dual-cavity master oscillator, thereby achieving temporal modulation of the output beam profile. The outputs from the master oscillator are amplified via a three-stage power amplifier yielding 36.6, 40.5, and 45.4 W of the maximum output at 116.8 W of incident pump power for the transverse electromagnetic, Laguerre-Gaussian, and quasi-top-hat beam, respectively. The prospects for further power scaling and applications via the dual-cavity master-oscillator power-amplifier （MOPA） system are considered.
基金supported by the National Natural Science Foundation of China(Nos.U20A20214 and 62275067)。
文摘We demonstrate a high power,Er:Lu AG single-longitudinal-mode laser in an anti-misaligned resonator.Based on the Faraday effect,a 1.61 W single-longitudinal-mode(SLM)laser is obtained with the double corner-cube-retroreflector(CCR)structure,and the tunable wavelength is 1649.2-1650.3 nm.Additionally,we investigate the anti-misalignment characteristics when the CCR moves and rotates along the optical axis.Furthermore,by utilizing the Er:Lu AG amplifier,the maximum 2.32 W single-longitudinal-mode laser at 1649.6 nm is achieved.The beam quality factors M^(2) of the 2.32 W Er:Lu AG single-longitudinal-mode laser are 1.23 and 1.25 along the horizontal(x)and vertical(y)directions,respectively.
基金National Natural Science Foundation of China(NSFC)(11704260,61575129,61605122,61775146)Natural Science Foundation of Guangdong Province(2016A030310049)+1 种基金Major Science and Technology Project of Guangdong Province(2014B010131006)Shenzhen Science and Technology Project(JCYJ20160427105041864,JSGG20160429114438287,KQJSCX20160226194031)
文摘We demonstrate, for the first time, to the best of our knowledge, an all-fiber figure-of-9 double-clad Tm-doped fiber laser operating in the dissipative soliton resonance(DSR) regime. Stable mode-locked rectangular pulses are obtained by using the nonlinear amplifying loop mirror(NALM) technique. A long spool of high-nonlinearity fiber(HNLF) and a segment of SMF-28 fiber are used to enhance the nonlinearity of the NALM loop and to obtain a large all-anomalous regime. Output power and pulse energy are further boosted by using a three-stage master oscillator power amplifier(MOPA) system. At the maximum pump power, average output power of up to 104.3 W with record pulse energy of 0.33 mJ is achieved with a 2 μm DSR-based MOPA system.
文摘固体MOPA(Master oscillator power amplifier)激光器是一种通过将固体激光器的主振荡器与功率放大器组合,放大低功率信号以输出高功率激光的装置,在激光加工、精密测量、医疗治疗和科学研究等领域有着广泛应用。光束质量作为激光器输出性能的关键指标,直接决定了激光器在这些应用中的效果和精度。但由于固体MOPA激光器中热效应的存在,激光输出过程中常伴随着光束质量的持续恶化,导致性能降低,因此优化光束质量便成为激光器性能提升的关键,在激光器的设计与应用中具有重要的研究与实践意义。本文综述了固体MOPA激光器光束质量优化技术的研究进展,重点介绍了热效应抑制技术、负透镜法、相位共轭法、可变形镜法、球差自补偿法、增益导引法和光束整形法等优化方法。通过分析这些技术的原理、实验进展及应用效果,讨论了它们在提高光束质量方面的挑战和创新成果。此外,文章还指出了固体MOPA激光器在高功率、高效率条件下光束质量优化的难点,并展望了未来可能的研究方向和技术突破。
文摘激光直接零部件标识(Laser Direct Part Marking)技术是一种在工业环境中证实可行,可实现高度自动化且绿色环保的标识技术,已经成为工业产品追溯中产品标识的首选手段。本文基于控制灵活、激光参数调节范围更大的MOPA(MOPA,主控振荡器的功率放大器)激光标识设备,按照ISO/IEC TR 29158条码技术标准,开展激光加工参数(如激光峰值功率、激光单脉冲能量、激光功率、填充间隔、扫描速度等)对激光直接标识(Direct Marking,DM)码质量(如条码等级、对比度、打印伸缩等)影响的研究。通过优化激光加工参数,实现了在AL2024材料表面标识高质量DM码的激光标识工艺。
文摘为了研制激光干涉成像所需的基于主振荡功率放大（Master Oscillator Power Amplifier,MOPA）结构的高能高相干脉冲单频激光器,需要研究经过功率放大后的脉冲时间相干性随激光功率（或能量）增加的变化趋势。本文采用声光调Q脉冲单频Nd：YVO_4激光器作为种子源,利用Nd：YAG功率放大模块对种子源激光进行2.1倍的脉冲能量放大。利用迈氏干涉测量法,完成种子源和2.1倍功放后激光在0～6 m光程差下干涉条纹对比度的实验测量,从而初步得到脉冲激光时间相干性（线宽）随激光功率（或能量）增加的变化趋势。同时也完成种子源和功放后激光的单频性、单脉冲能量、脉宽和峰值功率等基本参数的实验测量。
