共查询到20条相似文献,搜索用时 171 毫秒
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采用束转动90°环形非稳腔是使低增益激光器获得高功率及良好光束质量的极有效方法,本离这种腔采用一台He-Ne激光器提供导引光的准直技术。 相似文献
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为解决激光晶体传导冷却与输出光束能量分布对称性之间的矛盾,针对半导体激光器(LD)泵浦高功率固体激光器,提出了半环形侧面对称泵浦的方式。对多LD阵列同时泵浦激光晶体的吸收与增益情况进行了计算,并在实验中予以验证,采用半环形对称泵浦的方式,在20Hz的工作频率下,以总泵浦单脉冲276mJ的能量获得最大63.6mJ的圆形对称脉冲激光输出,斜效率34%。实验证明,采用对称泵浦结构能够有效的改善输出光束的空间分布,获得较为对称的激光输出。 相似文献
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提出一种LD侧泵固体激光陀螺仪方案,由泵浦装置、三角形环形腔、增益介质、F-P标准具、电光晶体、合光部分及读出电路组成。分析了环形腔稳定条件和腔内光束介质;采用电光晶体产生电光抖动减少陀螺仪的锁区;讨论了激光器器件选择及系统工作原理。方案能较好地克服热应力问题且环形腔没有负面积;使用切成布氏角的晶体增益,可实现全固态激光陀螺;可利用气体激光陀螺仪的现成工艺。 相似文献
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为了获得高光束质量中红外激光抽运源,采用正分支共焦非稳腔设计Nd:YAG脉冲固体激光器。在考虑晶体热效应情况下,对其腔型参量进行了数值模拟和试验验证,获得重复频率10Hz、脉冲宽度9.7ns、单脉冲能量260mJ、光束参量积3.5mmmrad的激光输出。该激光经放大后抽运MgO:LiNbO3晶体,实现波长3.85m、脉冲宽度8ns、单脉冲能量104mJ的激光输出,光光转换效率为12.5%。结果表明,该抽运源光束质量满足高峰值功率中红外光参变振荡激光器使用要求,为光电对抗领域的应用奠定了技术基础。 相似文献
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为了提高激光的光束质量和提供准直的平行光束,为抽运钛宝石提供优良的大功率的绿光抽运源,对激光二极管侧面抽运Nd:YAG声光调Q腔内倍频固体激光器进行了研究.实验中采用凸平直线非稳腔,将凸面镜和增益介质热透镜效应等效为望远镜系统进行分析.由实验可知,凸平非稳腔具有较大模体积、良好的稳定性等优点;利用二类相位匹配的磷酸钛氧钾晶体进行腔内倍频,当抽运功率为200W时,获得脉宽109ns、重复频率9.3kHz、发散角小于2mrad的42W绿光输出,光光转换效率达到21%,24h长时间的工作,不稳定性小于2%.结果表明,利用非稳腔腔型,在侧面抽运的模块中可以实现高效的大功率绿光输出. 相似文献
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A type of unstable ring resonator that includes a prism beam expander is proposed. Neither lenses nor curved mirrors are used, and transverse mode discrimination is achieved, despite the one-dimensional beam expansion, by configuring the cavity mirrors to cause 90° image rotation during a round-trip pass. The output beam has a filled-in rectangular cross section, and the cross section of the resonator mode is also rectangular. 相似文献
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将880 nm 上能级直接泵浦与部分端面泵浦混合腔结构结合,对Nd:GdVO4 晶体的1 342 nm激光输出特性进行了实验研究。采用正支离轴混合谐振腔,4-bar 中心波长为880 nm 的激光二极管列阵作为泵浦源,在泵浦功率为178W 时,激光输出功率为26.3W,斜效率和光-光转换效率分别为27%和14.8%。在20W 输出功率时非稳腔和稳腔方向的M2因子均为1.3。结果表明:由于采用了上能级直接泵浦与部分端面泵浦混合腔结构,相对于目前同等输出功率级别的端面泵浦Nd:GdVO4 激光器,光束质量得到很大提高。 相似文献
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We present a detailed theoretical and experimental study of the development of the EM field in pulsed, passively Q-switched solid-state lasers. We solve the rate equations separately for the gain medium and a passive Q-switch, thus accounting for the beam propagation and profile variations between them. Our model enables us to follow the pulse formation from a randomly generated seed EM field, thus monitoring the instantaneous beam pattern. The rate equations used include excited-state absorption in saturable absorber as well as the pumping term. The latter proves to be important when analyzing the beam profiles when passive Q-switching is used. In the case of stronger pumping, the formation of the second laser pulse is observed and shows mode structure characteristic of higher order Laguerre-Gaussian beams. Theoretical results are compared with experiment for three different types of laser resonators. Positive-branch unstable resonators with an ordinary and a super-Gaussian output mirror were studied in order to obtain top-hat beam profile. A plano-concave stable resonator was used as a reference. The calculated beam profiles and temporal developments are in good agreement with the experimental results which proves that the presented computational method can be used to predict the performance of other resonator designs. 相似文献