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运用谐振腔变换圆理论,详细分析了激光二极管抽运的Nd:YVO4平行平面腔固体激光器振荡光在晶体内的基模光斑半径随抽运功率变化的U形曲线.提出在适当腔长情况下激光器的输出功率随抽运功率变化曲线上将出现凹陷或尖峰现象,利用曲线上的凹陷和尖峰可以测量激光晶体的热透镜焦距.同时在理论分析的基础上进行了实验,实验结果与理论分析相符合
关键词:
Nd:YVO4
热透镜焦距
固体激光器
谐振腔变换圆 相似文献
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固体激光腔中的热聚焦透镜的屈光度l/ f , 作为腔的动力学因子, 对腔的运行特性具有关键的影响作用.本文运用变换圆图解方法, 对固体激光睦的稳定性、输出功率特征和模式特性作了详细的动力学分析, 并给出了它们对动力学因子的依赖关系.
关键词: 相似文献
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固体激光腔中的热聚焦透镜的屈光度1/f,作为腔的动力学因子,对腔的运行特性具有关键的影响作用。本文运用变换圆图解方法,对固体激光腔的稳定性、输出功率特征和模式特性作了详细的动力学分析,并给出了它们对动力学因子的依赖关系。 相似文献
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在固体激光腔运行中热透镜的屈光度,1ft,作为谐振腔的动力学因子,对腔的运行特性有着关键性的影响作用.运用变换圆图解方法,对固体激光腔的光模特性的动力学稳定性作了详细的分析,给出了它对动力学因子及腔参数u1=L1(L1-R1)R1与u2=L2(L2-R2)R2的依赖关系.给出了腔参数u1与u2的直观物理图像描述;在此基础上,利用变换圆图解方法,进一步讨论,如何选择腔参数u1与u2,调节稳定区内运行的最小基模光斑尺寸和动力学稳定区的宽度,及调控动力学稳定区的‘位置’;提出了两倍拓宽动力学稳定区的一个可行方案;最后,还讨论了动力学敏感腔的存在及其在自调Q激光器与自Kerr透镜锁模激光器中的可能运用.
关键词:
固体激光器
热透镜
动力学稳定性的调控 相似文献
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固体激光器在强抽运的条件下,激光晶体热透镜的球差效应是不容忽视的,尤其是在大基模体积的动态稳定腔中,会影响谐振腔的振荡模式,进而影响腔内损耗和输出功率.通过Fox-Li的衍射迭代算法,分析了谐振腔的自再现模,表明在热透镜球差效应作用下,基模的光强分布出现了旁瓣,并由此带来了光束质量的下降,最后通过实验结果验证了理论分析,指出光束填充因子是激光器设计的一个重要因素,其最佳值需要根据球差效应的强弱,通过实验的方法来确定.
关键词:
热透镜
球差效应
谐振腔模式 相似文献
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在半导体激光器高功率抽运的镱、钠共掺氟化钙(Yb, Na:CaF2)激光器中, 通过对晶体的负热透镜效应的数值模拟,进行激光器腔型的调节和优化,使得该激光器在采用2%的耦合输出镜和吸收抽运功率为7.8 W的条件下,获得了脉冲宽度为190 fs、平均输出功率为503 mW、中心波长为1034 nm、重复频率为82.4 MHz的连续锁模脉冲序列. 如果计算晶体表面反射等其他形式的泄漏输出,激光器的总平均输出功率为905 mW.
关键词:
Yb
2晶体')" href="#">Na:CaF2晶体
激光二极管抽运
飞秒激光 相似文献
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Jing-Qiang Wu 《International Journal of Infrared and Millimeter Waves》1987,8(8):949-973
Making use of the linear kinetic theory and the perturbation approach, a gyroklystron with feedback, in which a low order (TE011) mode is presented in the bunching cavity by the feedback of the output cavity, and the low order mode in the bunching cavity is coupled by the electron beam to a high order (TE021) mode in the output cavity, has been investigated in detail. And electron beam to wave interaction in each cavity and electron bunching mechanism in the bunching cavity have been analysed. The formulas of electron beam to wave interaction power and starting current etc. have been derived. Then some calculations are carried out. 相似文献
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研究了群聚电子注穿越同轴TM812模谐振腔的换能效率和同轴TM812模谐振腔中微波能量的提取方法,论证了其作为毫米波多注速调管的输出腔的可行性。研究结果表明:理想群聚电子注穿越同轴TM812模谐振腔的换能效率可达3.29%,一般群聚电子注穿越同轴TM812模谐振腔的换能效率可达1.86%;采用同轴TM812模谐振腔与沿轴向的同轴线耦合可以实现微波能量的提取;在输出腔工作频率为100.945 GHz,外观品质因数为2 243情形下,根据估算,最大输出功率可达15 kW。 相似文献
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The design and the numerical simulation of the interaction cavity for 120 GHz, 1 MW gyrotron is presented. The optimizations of the cavity parameters are carried out by using the Particle-in-Cell, 3D-electromagnetic simulation code MAGIC. The co-rotating TE22,6 mode is selected by using the in-house developed code GCOMS. The cold cavity and the beam–wave interaction analyses are carried out to analyze the eigenmode, eigenfrequency and the output power performance. The output power more than 1 MW is achieved at the magnetic field of 4.82 T. The sensitivity analyses of the output power and the frequency with respect to the various interaction cavity parameters are also performed. 相似文献
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Efficient and high-power laser-diode single-end-pumped Nd:YVO4 continuous wave laser at 1342nm 下载免费PDF全文
A compact, efficient and high-power laser diode (LD) single-end-pumped Nd:YVO4 laser with continuous-wave emission at 1342 nm is reported. With a single crystal single-end-pumped by fibre-coupled LD array, an output power of 7.36W is obtained from the laser cavity of concave-convex shape, corresponding to an optical-to-optical efficiency of 32.8%. The laser is operated in TEM00 mode with small rms amplitude noise of 0.3%. The influences of the Nd concentration, transmissivity of the output mirror and the cavity length on the output power have been studied experimentally. 相似文献
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The influences of misalignments of an axisymmetrical folded-combined (ASFC) CO2 laser on the output power are studied in detail. The new cavity axes are established by using the misaligned matrixes corresponding to the misalignments of the output mirror and the discharge tube, and the diffraction losses of the cavity and the output powers are calculated. It is shown that the influences of the misalignments on the output power are significant when the misalignment angle of the output mirror exceeds 20 s. These calculated values afford references for the design of ASFC CO2 lasers. 相似文献
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Y.J. Chen X.H. Gong Y.F. Lin Z.D. Luo Q.G. Tan Y.D. Huang 《Applied physics. B, Lasers and optics》2006,83(2):195-201
Passively Q-switched laser oscillation at 1060 nm from an unprocessed Nd:LaB3O6 cleavage microchip with a Cr4+:YAG saturable absorber has been demonstrated. The influence of absorbed pump power, output coupler transmission and cavity length on the output pulse characteristics has been investigated. For a plano-concave cavity with a cavity length of 28 mm, pulse with 100 mW average output power, 4.0 μJ energy, 17 ns duration, 25 kHz repetition rate, and 0.24 kW, peak power was obtained at the absorbed pump power of 1.42 W and output coupler transmission of 3.5%. For a plano-plano cavity with a cavity length of 5 mm, pulse with 85 mW average output power, 2.1 μJ energy, 2.3 ns duration, 40 kHz repetition rate, and 0.89 kW, peak power was obtained at the absorbed pump power of 1.42 W and output coupler transmission of 5.6%. Because a chopper with a 5% duty cycle was employed in the experiments to reduce the influence of pump-induced thermal loading, the above average output powers were obtained at the 5% duty cycle and extrapolated to 100%.PACS 42.55.Rz; 42.60.Gd; 42.70.Hj 相似文献
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Y. F. Ma X. Yu X. D. Li J. Gao J. B. Peng F. Chen Z. Zhang J. H. Yu 《Laser Physics》2008,18(12):1505-1507
A planoconvex cavity is used to compensate the thermal lens effectively for a Q-switched Nd:GdVO4 laser. The good beam quality of the continuous-wave (CW) output laser was obtained and the performances of the Q-switched laser were improved remarkably. The pulse width reduced and the output ratio of the Q-switching to free running increased resulting from the good beam quality of the planoconvex cavity compared with those used on a flat-flat cavity. 相似文献
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设计了外Q值较小,工作于高阶横磁TM310模的X波段速调管单间隙同轴输出谐振腔。用微波等效电路理论计算了高阶横磁TM310模情形六个漂移管的等效间隙中心位置,由此计算腔内等效间隙中心到输出波导内横向膜片的等效长度。以MATLAB编程计算得到同轴谐振腔TM310模式加载矩形波导滤波器输出回路的间隙阻抗,其结果与传统冷测模拟法计算结果吻合。验证了等效长度计算方法的正确性,用于圆柱腔基模的传统微波等效电路理论能用于分析同轴谐振腔高阶横磁模式输出回路,且比传统的冷测模拟法及场分析法更为快捷。 相似文献
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Mode frequency shifts and Q-factor changes in 2D microflower cavity and its deformed cavity are analyzed. The effective mode-splitting of double-degenerate WG modes is obtained and the Q-factor changes of matched and mismatched modes are discussed for the microflower cavity. The Q-factor stability of the splitted WGH(8,1) modes due to two types of local deformations is studied, showing that the local deformations can badly spoil the mode Q-factor if the deformations are not controlled properly. The output directionality of the splitted WGH(8,1) modes due to the local deformations also is presented, and a basically unidirectional light output of OO mode under local deformation DA (deformation happens at one “valley” of the microflower cavity) is obtained. 相似文献