共查询到18条相似文献,搜索用时 62 毫秒
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Nd:YVO4和Nd:YAG全固态激光器输出特性的比较分析 总被引:5,自引:0,他引:5
基于Nd:YVO4晶体的能级结构和速率厅程,对激光二极管端面抽运Nd:YVO4同体激光器的输入输出特性参量进行了理论研究。并通过数值计算得到了其振荡光的光斑与抽运光斑的匹配程度、增益介质的长度、腔内同有损耗和输出镜透过率的最佳值,并通过与激光二极管抽运Nd:YAG同体激光器的输出特性进行比较,获得了在相同条件下Nd:YVO4晶体的输出特性优于Nd:YAG晶体的高功率端面抽运的全同态激光器,其理论值与实验结果相吻合。 相似文献
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Nd:YVO4晶体,具有发射截面大、吸收系数高和吸收光谱宽等特点,因而用它做增益介质的激光泵光阈值低和转换效率高,非常适合于二极管激光器(LD)泵浦.国内曾有在低功率LD泵浦情况下获得光学斜效率达60%、连续波1.064μm激光输出的报道.在大功率LD泵浦情况下,由于Nd:YVO4晶体热传导性能较差,因此将产生较强的热透镜效应,破坏腔的稳定性,光束质量变基,功率输出和转换效率都会下降。为尽量减小腔内热透镜效应的影响,我们在实验中除了进一步完善腔结构外,采用大尺寸低浓度掺杂的Nd:YVO4晶体。实验结果表明,这样的增益… 相似文献
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Mg:Nd:LiNbO3晶体生长及其光学性能研究 总被引:1,自引:0,他引:1
在LiNbO3晶体原料中掺入w(Nd2O3)=0.2%和x(ZnO)=7.0%,以提拉法生长Nd:LiNbO3和Mg:Nd:LiNbO3晶体,并对晶体进行极化处理。测试了晶体的紫外可见吸收光谱、荧光光谱和红外吸收光谱。由吸收光谱确定泵浦光波长,由荧光光谱确定激光振荡波长。通过直接观察光斑畸变法测试了Mg:Nd:LiNbO3晶体的抗光损伤能力,结果表明,Mg:Nd:LiNbO3晶体的抗光损伤能力比Nd:LiNbO3晶体提高2个数量级以上。测试了晶体的倍频性能,Mg:Nd:LiNbO3晶体的相位匹配温度为102℃,相应的倍频转换效率达到28%。 相似文献
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Nd:GdVO4和Nd:YAG全固态激光器输出特性的比较 总被引:2,自引:2,他引:0
文中基于Nd:GdVO4晶体的能级结构和速率方程理论,对激光二极管端面抽运Nd:Gd.VO4固体激光器的输入输出特性参数进行了理论研究。通过数值计算得到了其振荡光的光斑与抽运光斑的匹配程度、增益介质的长度、腔内固有损耗和输出镜透过率的最佳值,并通过与激光二极管抽运Nd:YAG固体激光器的输出特性进行比较,获得了在相同条件下Nd:GdVO4晶体的输出特性优于Nd:YAG晶体的高功率端面抽运的全固态激光器,其理论值与实验结果一致。 相似文献
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Pfistner C. Weber R. Weber H.P. Merazzi S. Gruber R. 《Quantum Electronics, IEEE Journal of》1994,30(7):1605-1615
The thermally induced beam distortions in end-pumped Nd:YAG, Nd:GSGG, and Nd:YLF rods were analyzed and the influence of edge- and face-cooling was investigated. The distributions of temperature, stress, and strain in the crystals were calculated by finite element analysis. Based on these data, the space-resolved changes of the refractive index were determined considering thermal dispersion, surface deformation, and strain-induced birefringence. The resulting optical path difference for one round-trip in the end-pumped rods was integrated numerically. For each rod, the induced thermal lens was determined over the extent of the pump spot radius. The calculations of the optical path difference were experimentally confirmed by investigations using a modified Twyman-Green interferometer with a polarized HeNe probe beam at 633 nm under lasing and nonlasing conditions 相似文献
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报道了一台激光二极管(LD)双端面抽运Nd:YLF和Nd:YAG双晶体串接多波长输出脉冲激光器。在抽运能量40.5mJ,电光调Q重复频率500Hz的工作条件下,获得单脉冲能量约为6mJ的1064nm/1053nm双波长激光脉冲输出,光-光转换效率约为14.8%。相同抽运条件下在腔内插入I类相位匹配LBO晶体作为非线性频率转换器,获得了脉冲总能量为3.6mJ的526.5、529.0、532.0nm三波长同时输出,由抽运光到输出绿光脉冲的转换效率约为8.9%,测得光束质量因子分别为M2x=1.61,My2=1.25。 相似文献
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The authors have experimentally measured the energy stored and the heat generated in flashlamp-pumped Cr:Nd:GSGG for three Cr3+ concentrations in the range of 1-2×1020 ions/cm3 . It has been found that the energy storage efficiency in these samples is 1.7 times greater than that of the Nd:YAG sample, and the normalized heating parameter χ, defined as the heat deposited per unit of stored energy, is 2.5 under the specified pumping conditions, with no evident dependence on the Cr3+ concentration. It has been been found that the measured χ value for the sample of Nd:YAG is 2.9 for the same pumping conditions. These observed χ values exceed expected values by factors of ~1.1 and 2 for the Cr:Nd:GSGG and Nd:YAG samples, respectively. The thermal focal length in the two materials was measured showing that the lensing is shorter in GSGG by a factor of 2.6 for the same available output power, or a factor of 4.5 for the same input pump power. The expected thermal lensing was determined using measured heat loads with no adjustable parameters, achieving satisfactory agreement with measured lensing values 相似文献
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阳光泵浦Nd:YAG激光器 总被引:2,自引:0,他引:2
第一台激光器问世不久,便有人致力于太阳能激光器的研究工作,鉴于Nd;YAG晶体的特点,所以阳光泵浦Nd;YAG激光器获得了长足发展,其研究和应用均取得了可喜的成绩,太阳能转化为激光的效率不断提高,输出功率逐渐增加,性能不断完善,各种应用构上继出台。 相似文献
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Nd:YAG激光治疗分泌性中耳炎 总被引:2,自引:0,他引:2
用Nd:YAG激光在鼓膜前方造孔,孔径2~3mm,多数病例听力改善在半年内未再出现中耳积液。激光治疗分泌性中耳炎具有显效、简单、安全,易于推广的实用价值。 相似文献
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用YAG锁模激光器进行实验,在YAG中反转粒子数最大时,在锁模脉冲中选出单个脉冲并由右偏振器和Q开关普克尔盒注入再生放大器内,进行十几个双程的放大。在放大脉冲达到峰值时用倒空普克尔盒把它倒出腔外。未发现放大脉冲宽度有明显增宽。测得单个放大脉冲能量>0.5毫焦耳,放大倍数~0.5×10~6。可见再生放大器有很高的放大能力。 相似文献
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