共查询到19条相似文献,搜索用时 218 毫秒
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La3Ga5SiO14电光调Q的Nd:LiYF激光器研究 总被引:2,自引:0,他引:2
报道了以Nd:LiYF(Nd:LYF)为增益介质、用硅酸镓镧(La3Ga5SiO14,LGS)晶体进行电光调Q的非稳腔调Q激光器的脉冲特性。Nd:LiYF的两端按σ偏振1、053μm光的布儒斯特角切割,不需另加起偏镜.实现了单一偏振光振荡。LGS晶体电光Q开关插入损耗小(2%),抗光伤阈值高(950MW/cm^2),与DKDP相比,具有不潮解等优点。当抽运能量为120J、重复率3Hz时,单脉冲输出能量为275mJ,脉冲宽度为8ns.动静比为76%.输出能量不稳定度小于3%,偏振度大于99%,光束发散角为0.7mrad。文中还对本激光器偏振特性、非稳腔设计、LiYF导热性能和热透镜效应补偿进行了分析.对LGS电光调Q开关工作性能、工作方式以及存在的问题也进行了分析。 相似文献
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通过对硅酸镓镧(LGS)晶体旋光性与电光效应的交互作用的理论研究,推导出晶体旋光性和电光效应共同作用下的光强表示式I=1-4B2(Asin 2ω-Ccos 2ω)2。利用此表示式设计计算了旋光晶体LGS尺寸为8 mm×8 mm×25 mm电光Q开关在1064 nm波长使用时的开关电压和偏振角分别为4995 V和27.3°。将理论研究得到的结论应用于LGS晶体电光调Q的Nd∶YAG晶体激光器的实验研究中,实验结果与理论计算结果基本一致。得到输出能量为361 mJ,脉冲宽度为7.8 ns的脉冲激光输出。 相似文献
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退压式La3Ga5SiO14晶体电光调Q Nd:YAG激光器激光性能研究 总被引:1,自引:0,他引:1
通过对硅酸镓镧(LGS)晶体旋光性与电光效应的交互作用的理论研究,推导出晶体旋光性和电光效应共同作用下的光强表示式I=1-4B2(Asin 2ω-Ccos 2ω)2.利用此表示式设计计算了旋光晶体LGS尺寸为8 mm×8 mm× 25 mm电光Q开关在1064 nm波长使用时的开关电压和偏振角分别为4995 V和27.3°.将理论研究得到的结论应用于LGS晶体电光调Q的Nd:YAG晶体激光器的实验研究中,实验结果与理论计算结果基本一致.得到输出能量为361 mJ,脉冲宽度为7.8 ns的脉冲激光输出. 相似文献
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报道了一种基于电光-可饱和吸收主被动双调Q技术的窄脉冲宽度、高峰值功率946nm全固态激光器.该激光器采用808nm脉冲半导体激光侧面泵浦长尺寸Nd∶YAG晶体棒抽运方式和双凹型折叠谐振腔结构,并将横向加压式的双45°角切割掺氧化镁铌酸锂晶体电光调Q与单层二硒化钼被动可饱和吸收调Q相结合,通过优化设计谐振腔结构,在脉冲重复频率550 Hz时,获得了最大单脉冲能量3.15mJ、脉冲宽度9.1ns、峰值功率高达346kW的946nm主被动双调Q脉冲激光的稳定输出,脉冲宽度和能量的峰峰值不稳定度分别达到±2.87%和±3.42%,光束质量因子分别为M_x~2=3.851和M_y~2=3.870. 相似文献
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针对机载激光测距及激光指示应用需求,设计了一种紧凑可靠的电光调Q脉冲激光器。从调Q速率方程出发,分析了激光器输出能量随优化参数z增大而增大、脉宽随z增大而减小的关系。采用?6 mm×56 mm的Nd:YAG激光晶体,LD侧面泵浦,角锥棱镜作为折光器的u形折叠式非稳腔,在增益满足的前提下,提高谐振腔抗失调能力。在注入电脉冲1.2 J条件下,激光器单脉冲能量输出为108 mJ,脉冲宽度为11.8 ns,能量不稳定度 < 0.8%;光-光效率18%,可长时间稳定运行。 相似文献
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A diode-end-pumped electro-optic (EO) Q-switched Nd:YVO4 laser operating at repetition rate of 10 kpps (pulses per second) was reported. A block of La3Ga5SiO14 (LGS) single crystal was used as a Q-switch and the driver was a metal oxide semiconductor field effect transistor (MOS-FET) pulser of high repetition rate and high voltage. At continuous wave (CW) operation, the slope efficiency of the laser was 46%, and maximum optical-to-optical efficiency was 38.5%. Using an output coupler with transmission of 70%, a 10-kpps Q-switched pulse train with 0.4-mJ monopulse energy and 8.2-ns pulse width was achieved, the optical conversion efficiency was around 15%, and the beam quality M2 factor was less than 1.2. 相似文献
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利用激光二极管(LD)端面抽运Nd∶YVO4激光晶体皮秒三倍频355nm全固态紫外激光器,采用半导体可饱和吸收镜(SESAM)锁模技术及皮秒再生放大技术,对1 064 nm基波采用Ⅰ类相位匹配Li3B3O5(LBO)晶体二倍频和Ⅱ类相位匹配LBO晶体三倍频,获得了稳定性好、倍频效率较高的355 nm紫外激光输出。当二极管泵浦功率为5 W时,获得了脉宽为17 ps、重复频率为1 Hz、单脉冲能量为129.6 J的稳定三倍频紫外激光输出,基频光到二倍频光和三倍频光的转换效率分别达到60.3%和16.6%,3 h输出单脉冲能量的抖动在0.58%以下。 相似文献
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ZHANG Qidi ZHAO Shengzhi ZHANG Xingyu WANG Qingpu ZHENG Jia' an SUN Lianke ZHANG Shaojun 《Chinese Journal of Lasers》2001,10(1):19-23
By using a laser-diode as pump source, a Cr4+ :YAG crystal as saturable absorber for passive Q-switch and a KTP as intracavity frequency doubling crystal, we have realized the green Q-switched laser output at 0.5295 μm from a Nd: S-FAP crystal. Output green laser characteristics, such as average power, single pulse energy, pulse width, repetition rate for different small-signal transmission of Cr4+ :YAG and different pump power, were measured. Meanwhile, the coupling rate equations of intracavity frequency doubling with Cr4+ :YAG as passive Q-switch were given and the numerical solution of equations agreed with the experimental results. 相似文献
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A type of electro-optic Q-switch is designed by using optically active crystal La3Ga5SiO14 (abbreviated as LGS), in which the polarization plane gyration and electro-optic effect exist simultaneously. The configuration of the Q-switch is based on the consideration that the total rotation angle of the polarization plane of the polarized laser is zero, while the laser in the cavity propagates through the Pockels cell back and forth. The Q-switch placed in a Nd3 +:YAG laser behaves normally, like those without optical activity. Compared with the DKDP Q-switch, the LGS Q-switch has more superiorities, which make it a suitable replacement for the DKDP Q-switch in lasers with medium-output energy. 相似文献
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LI Ping WANG Qingpu ZHANG Xinyu ZHAO Shenzi GAO Da LIU Xunmin SUN Lianke ZHANG Shaojun HUANG Bobiao LIN Benfu ZHANG Fanwen 《中国光学快报(英文版)》2000,9(2)
It is investigated the properties of a diode-pumped Nd: Sr5 ( PO4 )3F laser that is passively Q-switched by a thin, single crystal GaAs wafer. The short high-peak-power pulses of the laser have been obtained. The pulse energies, pulse widths and pulse repetition rates for different conditions have been measured and the experimental results show that GaAs is an excellent passive Q-switch of the diode-pumped Nd: Sr5(PO4)3F lasers. 相似文献
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硅酸镓镧(La3Ga5SiO14,langasite,简称LGS)是一种多功能晶体。LGS和石英同属32点群,具有良好的压电和电光性质,本文在综述LGS晶体基本性质的基础上,总结了我们对这种晶体生长和性质的研究工作,测量了LGS晶体电光性质,采取措施消除旋光性影响,首次用其设计制作了电光Q开关,结果表明其效果与DKDP晶体电光Q开关相当;进而开发了高功率高重复频率Q开关,双端面泵浦模式,激光重复频率为50 KHz时,最高输出可以达到12.5瓦,脉宽为46 ns。通过改进晶体生长条件,可获得直径约50 mm,长度为100 mm,重约1000 g的光学级LGS晶体,基本满足晶体电光Q开关应用的要求。 相似文献
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为获得人眼安全的激光,在一个由激光二极管(LD)阵列侧泵、声光调Q的Nd∶YAG激光器谐振腔中放置一非临界相位匹配的KTP晶体,形成了一个内腔式光学参量振荡器,实现了准连续的1.57 μm激光振荡.通过对单谐振光学参量振荡器阈值公式进行讨论,采用了平凹腔的结构和尽可能短的光学参量振荡器腔长,有效地降低了光学参量振荡器的泵浦阈值.测量了不同声光重复率和不同透射率输出镜下光学参量振荡器输出的各项特性参量.分析了声光重复率和输出镜的透过率对光学参量振荡器的泵浦阈值和输出脉冲波形的影响,并对实验中出现的饱和现象作了解释.当泵浦电流14.5A,声光重复率10 kHz,光学参量振荡器输出镜透过率15%时,在保持单脉冲输出的情况下,获得了1.57 μm激光的最高平均功率输出值1.748 W. 相似文献
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Shengzhi Zhao Xingyu Zhang Qingpu Wang Jiaan Zheng Qidi Zhang Shujun Zhang Lianke Sun Huanchu Chen 《Optics & Laser Technology》2001,33(5)
Nd3+ : Ca4GdO(BO3)3, known as Nd : GdCOB, is a new self-frequency doubling laser crystal. Using Cr4+ : YAG as passive Q-switch, we have realized the Q-switched laser running at 0.53 μm with an Nd : GdCOB crystal. Meanwhile, the pulse width, the single pulse energy and the repetition rate under different small-signal transmission of Cr4+ : YAG and different pump conditions are measured and the numerical solutions of the coupling wave rate equations agree with the experimental results. 相似文献