共查询到18条相似文献,搜索用时 78 毫秒
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通过建立激光介质非热平衡状态的振荡散热模型,分析了激光二极管抽运固体激光器中,热透镜的不稳定性.研究表明,热透镜的这种热不稳定性是造成激光场不稳定的重要因素.会造成高斯半径的不稳定波动,会使激光光束的指向角波动,会造成激光光斑的非对称畸变,这种畸变也处于波动之中.通过对端面抽运条件下,热耗为1W的Nd:YAG激光介质的理论和实验研究,确定了这种原因下光场不稳定度的数量级.
关键词:
激光二极管
固体激光器
热透镜 相似文献
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报道了用高功率线列阵光纤耦合激光二极管端面抽运的1342nmDd:YVO4激光器,在13.30W输入抽运功率下,1342nm激光输出功率达到3.22W,斜效率为25.5%。输出功率不稳定度小于1%。 相似文献
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激光二极管端面抽运Nd:YVO4实现1386 nm连续波激光输出 总被引:11,自引:5,他引:11
在Nd:YVO4晶体的4F3/2-4I13/2跃迁带内,除了1342 nm激光辐射之外,其它的跃迁谱线由于小的受激发射截面和强的寄生振荡,很难形成激光振荡.通过调整谐振腔损耗,获得了光纤耦合激光二极管端面抽运1386 nmNd:YVO4激光器激光连续输出.在抽运功率达到4.24 W时,得到了305 mW的1386 nm激光连续输出,最高输出功率下的斜效率为13.9%.实验中还观察到了1342 nm和1386 nm的双波长运转.根据抽运阈值能量和实验数据,计算得到了Nd:YVO4晶体中1386 nm激光辐射处的受激发射截面大约为(3±1)×10-19cm2. 相似文献
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激光二极管端面抽运Nd:YVO4板条激光器及其热效应 总被引:9,自引:2,他引:7
激光器中激光介质采用板条状几何结构可以极大地降低它的热效应,但仍然需要进一步分析其影响,进而优化激光器效率.利用有限元分析方法分析了部分端面抽运的混合腔板条激光器中激光介质的热效应,计算的热透镜焦距与实测结果基本相符.分析了热效应对模式匹配的影响,分析结果对于优化激光器效率、改进谐振腔设计具有一定的参考价值.并在分析的基础上进行了混合腔实验,抽运功率为110 W时,获得连续输出激光功率41.5 W,光光转换效率约38%,斜效率达58.8%,M2因子为非稳腔方向M2x=1.59,稳定腔方向M2y=1.55. 相似文献
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理论上分析了端面抽运的1.34μm Nd:YVO4平凹腔型激光器的各项参数;实验上实现了LD端面抽运的1.34μm Nd:YVO4平凹腔型激光器的运转. 相似文献
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大功率部分端面抽运混合腔板条激光器 总被引:18,自引:4,他引:18
在半导体抽运的全固态激光器中,激光晶体上的热畸变限制了激光器在大功率下输出时保持高光束质量的能力。板条结构的固体激光器具有优异的散热能力,再配合部分端面抽运以及稳一非稳柱面混合腔的使用,使大功率高光束质量的激光输出成为可能。在德国EdgeWave GmbH进行的对这一技术的合作研究中,利用不到100mm的腔长,在Nd:YVO4板条激光器上获得了110W近衍射极限的1.06μm连续激光输出,这时在非稳腔方向上的光束传播因子M^2为1.3。在稳腔方向上为1.5。通过对输出激光进行空间滤波切除腔镜造成的衍射旁瓣后,50W输出时M^2的典型值在非稳腔和稳腔方向上分别为1.09和1.2。 相似文献
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Wenjie Xie Siu-Chung Tam Yee-Loy Lam Hongru Yang Jianhui Gu Gang Zhao Wilson Tan 《Optics & Laser Technology》1999,31(8):555-558
Based on space-dependent rate equation, the lowest threshold input power for diode end-pumped solid state lasers is obtained for pump spot size wp → 0. However, when the pump beam waist is decreased, the far-field half-angle increases due to the same beam quality, which will influence the match between the pump volume and mode volume. Most importantly, when the pump beam waist is decreased, the temperature and temperature gradient in the laser rod would be very high due to the resulting heat, which would cause material distortion, variation of refractive index, instability of laser resonator etc. We analyze the temperature distributions with different pump beam sizes and conclude that the condition wp ≈ w0 (the radius of the laser beam at the laser rod) is often taken as a rough guide to the optimum case. 相似文献
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理论上分析了端面抽运的1.34μm Nd:YVO4平凹腔型激光器的各项参数;实验 上实现了LD端面抽运的1.34μm Nd:YVO4平凹腔型激光器的运转.
关键词:
固体激光
4晶体')" href="#">Nd:YVO4晶体
平凹腔 相似文献
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LIU Junhai LU Jianren LU Junhua SHAO Zongshu JIANG Minhua 《Chinese Journal of Lasers》1999,8(2):103-108
The stability of linear planar resonators involved in solid-state lasers is entirely decided by the thermal lens of the laser crystal. There exists a critical point between stable state and unstable state at which the thermally focusing point falls on the surface of one end mirror. Based on this fact, a new method for measuring the thermal focal length has been presented, and applied to three different Nd3+-doped (2%, 0.8%, and 0.5% ) Nd:YVO4 crystals at various absorbed pump power levels up to 10 W, the results show a good agreement with those of theoretical calculation. It also indicates that the thermal lensing is strongly dependent on the Nd3+-doped concentration, and is affected by crystal surface temperature, especially in the situation of weak thermal lensing. 相似文献
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Efficient Nd:YVO_4 laser in-band pumped by wavelength-locked 913.9-nm laser diode and Q-switch operation 下载免费PDF全文
An efficient 1064-nm Nd:YVO_4laser in-band pumped by a wavelength-locked laser diode(LD) at 913.9 nm was demonstrated. The maximum continuous wave(CW) output power of 23.4 W at 1064 nm was realized with the incident pump power of 40 W, corresponding to a total optical-to-optical efficiency of 58.5%. This is to the best of our knowledge the highest total optical-to-optical efficiency and output power of Nd:YVO_4laser in-band pumped by a 913.9-nm laser diode.The Q-switched operation of this laser was also investigated. Through a contrast experiment of pumping at 808 nm, the experimental results showed that an Nd:YVO_4laser in-band pumped by a wavelength-locked LD at 913.9 nm had excellent pulse stability and beam quality for high repetition rate Q-switching operation. 相似文献
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The thermal effects of the diode end-pumped Nd:YVO4 slab laser crystal are investigated both analytically and numerically. The theoretical model is established with considering the divergence of the pump beam in the slab. A detailed theoretical analysis of the temperature, stress and the focal length of thermal lens are presented. Using 3D finite element analysis, an accurate numerical solution based on the theoretical model is achieved. Our analysis includes the thermal fracture damage of the thermally and optically anisotropic slab and the predicated values are compared with the experimental results. 相似文献