共查询到20条相似文献,搜索用时 555 毫秒
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半导体激光放大器的电路模型及噪声特性分析 总被引:2,自引:0,他引:2
给出了半导体激光(LD)放大器的电路模型,使得对半导体激光放大器的特性可以用通用电路分析软件进行分析。用该模型对谐振型光放大器光功率输出特性与失谐关系进行了模拟分析,模型的分析结果与已报道的理论和实验基本一致;用该模型还对谐振光放大器的噪声进行了分析。 相似文献
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从理论上分析了激光相位及振幅的随机涨落对由热效应引起的时间延迟激光感生双光栅(TDLIDG)的影响.结果表明,四波混频信号调制的振幅随两束泵光相对延迟的增加而衰变.实验结果与理论预测基本一致.我们还证实用TDLIDG测量两束光的波长差可以达到与激光线宽同一量级的精度. 相似文献
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激光自倍频晶体是一类同时具有激光和非线性效应的复合功能晶体。以激光自倍频晶体制作的全固态激光器具有体积小,调整方便,稳定性高等优点。自1970年代以来,以LiNbO3,YAl3(BO3)4倍频晶体为基质的激光自倍频晶体实现了自倍频激光运转。近年来,以RECa4O(BO3)3(RECOB)为基质的激光自倍频晶体受到重视和广泛研究。本文从对激光晶体、非线性光学晶体及激光自倍频晶体的基本要求出发,在综述激光自倍频晶体研究历史的基础上,讨论了激光自倍频晶体中的基波和倍频光,探讨了NYAB和Nd:GdCOB一类晶体中晶体长度,Nd3+浓度和效率之间的关系。理论估算表明,当浓度适当,晶体长度10mm时,这两类晶体的光–光转换效率可达30%以上。本文总结了NYAB系列晶体的研究历程及RECOB系列激光自倍频研究的思路及取得的成果。在最近10年中,利用山东大学生长的Yb:YAB晶体,获得1.1 W自倍频绿光,光光转换效率为10%;在RECOB体系中,比较了各种晶体的特点,选定Nd:GdCOB为主要研究对象,经过晶体掺钕浓度和长度关系,位相匹配方向、膜系及热工程等多方面研究,获得了1.36 W的545 nm绿光输出,光–光转换效率为17.1%;输出功率为1.03 W时,半小时功率波动不超过1%。这是目前为止,Nd3+离子激光自倍频晶体的最好结果。文章最后介绍了激光自倍频晶体的可能应用。通过理论和实验分析,认为到目前为止Nd:GdCOB是以Nd3+为激活离子最后的激光自倍频晶体,而在Yb3+为激活离子时,Yb:YAB晶体最佳。 相似文献
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LIU Junhai WANG Jiyang SUN Lianke SHAO Zongshu JIANG Minhua 《Chinese Journal of Lasers》2001,10(1):1-5
1 Introduction Self frequency doublinglasercrystals,whichcombinetwodifferentfunctionsoflaseremissionandfrequencyconversion ,provideasimplewayofgeneratingcoherentvisibleradiation .Amongthevariousself frequency doublingcrystals ,neodymiumyttriumaluminumbora… 相似文献
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F. Mougel F. Augé G. Aka A. Kahn-Harari D. Vivien F. Balembois P. Georges A. Brun 《Applied physics. B, Lasers and optics》1998,67(5):533-535
3+ :Ca4GdO(BO3)3 (Nd:GdCOB). 21 mW of green cw laser emission for an absorbed pump power of 820 mW were achieved under laser diode-pumping.
64 mW of green cw laser output were obtained with 1 W of absorbed pump power under titanium-sapphire pumping. Its availability
in large-size crystals with good optical quality makes Nd:GdCOB a true challenger to the best SFD laser crystal reported so
far: Nd:YAl3(BO3)4 (Nd:YAB or NYAB).
Received: 2 March 1998/Revised version: 20 May 1998 相似文献
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研究了LD抽运的单纵模Cr,Tm,Ho∶YAG微片激光器,激光器厚度为1?mm,在用波长785?nm的LD进行端面抽运时,激光器阈值为1060?mW,单纵模激光最大输出功率为31?mW. 对激光器输出功率随温度变化特性进行了研究,验证了CTH∶YAG晶体的温度敏感性. 还研究了激光器的温度调谐特性,实验测得激光器的温度调谐系数为14?GHz/℃.
关键词:
激光光学
CTH∶YAG微片激光器
LD抽运
单纵模运转 相似文献
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LD泵浦Nd:YAG微片激光器 总被引:3,自引:0,他引:3
LD泵浦Nd:YAG微片激光器结构简单紧凑,与半导体激光器相比,前者具有激光线宽窄、光束质量好、相干长度长等优点,因此在一些测量领域有着较好的应用前景。目前对LD泵浦Nd:YAG微片激光器的实验工作主要是获得单频、单模连续输出和线性频率调制特性研究。本文综述了近几年来LD泵浦Nd:YAG微片激光器的研究方向、成果及应用,主要介绍了各国对LD泵浦Nd:YAG微片激光器的调频特性的研究状况 相似文献
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The thermal lensing, output characteristics of an end-pumped NYAB laser with high pump power levels and operated at the fundamental wavelength, and the manner of self-frequency-doubling, have been investigated. The thermal lensing in the NYAB crystal was found to be significantly stronger than that in Nd:YVO4 crystal. A maximum output of 3.2 W at 1.06 μm was achieved with an optical conversion efficiency of 29.1% and an average slope efficiency of 37.5%. These results were found to be slightly inferior to those of Nd:YVO4 crystal. When operated in the fashion of selffrequency-doubling, 23 mW green output was obtained at the incident pump power of 5 W, such inefficient operation was attributed to the large mode size in the NYAB crystal. 相似文献
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线阵激光二极管侧面抽运Nd∶YAG激光器特性研究 总被引:1,自引:0,他引:1
依据四能级系统速率方程 ,推导出了多横模振荡固体激光器输出与输入参量的关系。对二极管抽运固体激光器中线阵激光二极管三向对称侧面抽运结构 ,计算了抽运光强分布 ,并就激光器的阈值抽运功率、近阈值条件下的斜率效率、输出功率和光束质量等与抽运参量的关系 ,进行了数值计算。由计算结果看出 ,线阵激光二极管侧面抽运Nd∶YAG激光器中晶体半径和抽运光束腰半径是影响输出激光功率和光束质量的主要因素 ,并通过在谐振腔中加小孔选模 ,使光束质量得到明显改善。选择了一组三向侧面抽运结构参量进行了实验验证 ,实验结果与理论计算一致。 相似文献
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Jun Dong A. Shirakawa K.-I. Ueda A.A. Kaminskii 《Applied physics. B, Lasers and optics》2007,89(2-3):367-376
A theoretical model based on a quasi-four-level system is modified to investigate the effect of Yb concentration on performance
of continuous-wave Yb:YAG microchip lasers by taking into account temperature-dependent thermal population distribution, temperature-dependent
emission cross-section and concentration-dependent fluorescence lifetime, thermal loading, thermal conductivity, and thermal
expansion coefficient. The local temperature rise in Yb:YAG crystal caused by the absorbed pump power plays an important role
in the laser performance of Yb:YAG microchip lasers working at ambient temperature without actively cooling the sample. The
output wavelengths dependent on output coupling, Yb concentration, and pump power level were analyzed quantitatively. The
numerical simulation of Yb:YAG microchip lasers is in good agreement with experimental data. The optimized laser operation
for Yb:YAG microchip lasers is proposed by varying the thickness and output coupling for different Yb concentrations. The
effect of thermal lens, thermal deformation effect, and saturated inversion population distribution inside the Yb:YAG crystal
on performance of heavy-doped Yb:YAG microchip lasers are also addressed.
PACS 42.55.Xi; 42.70.Hj; 42.55.Rz 相似文献
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激光二极管泵浦NYAB激光器的空间分布速率方程的研究 总被引:1,自引:0,他引:1
报道了用以描述激光二极管泵浦NYAB连续激光顺空间分布特性的非线性耦合的速率方程组,和以此方程组进行的理论计算,讨论了泵浦光和激光的空间分布、晶体的最佳长度、输出镜的最佳透过率对激光器输出的影响,给出了NYAB激光器设计的一些依据。 相似文献