共查询到18条相似文献,搜索用时 62 毫秒
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以Nd:MgO:LiNbO_3同时兼作激活介质和非线性光学材料,研究自倍频激光器。用小型氙灯泵浦,在室温下获得二次谐波激光(0.547μm) 阈值小于4.8'J,最大输出400μJ/shot,工作温度范围大于20℃~45℃,无光损伤。 相似文献
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研究了基波相位畸变对二次谐波相位分布的影响。针对具有不同像差、而光强分布为高斯型光束,以KDP晶体I类匹配为例,数值计算得到其二次谐波光束的光强分布和相位分布,分析了基波的像差、离散效率以及衍射效应的影响效果。研究表明不同的像差对于谐波的影响是不同的,主要取决于由其引起的全口径上相位失配的情况;离散效应主要带来的是倾斜像差,其高阶像差的影响随着离散效应的加剧而增大;而衍射效应的影响在一般情况下都是可忽略的。最后给出了在离散效应和衍射效应的影响可以忽略的情况下,基波相位畸变对二次谐波影响的近似估算式。 相似文献
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给出了不同基频光和倍频光偏振态组合情况下,淀积在固体基板上的Langmuir-Blodgett单分子层膜在面对入射光方向和背对入射光方向时,反射及透射光学二次谐波产生随入射角变化关系的理论公式。在此基础上,对一种芪盐LB膜样品进行变入射角的透射二次谐波产生研究。 相似文献
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Cascaded optical rectification and the consequent linear electro-optic effect have been investigated theoretically. Nonlinear phase shift of the fundamental beam caused by the cascading process was found to be proportional to the input intensity and the propagation length as in the Kerr effect. It is notable that the depletion of the fundamental optical pulse energy is negligible even for large nonlinear phase shifts. 相似文献
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本文采用固定入射角,改变入射光偏振方位角的方法从实验上了研究了锗薄膜的透射光学二次谐波产生及其变化规律,并从理论上推导了产生透射二次谐波的表达式,最后拟合求得描述面谐波电流的唯象参数a。 相似文献
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K_3B_6O_(10)Cl(KBOC), a new nonlinear optical crystal, shows potential advantages for the generation of deep ultraviolet(UV) light compared with other borate crystals. In this paper we study for the first time the second harmonic generation(SHG) of a femtosecond Ti:sapphire amplifier with this crystal. Laser power is obtained to be as high as 220 m W at the central wavelength of 396 nm with a 1-mm-long crystal, and the maximum SHG conversion efficiency reaches 39.3%. The typical pulse duration is 83 fs. The results show that second harmonic(SH) conversion efficiency has the room to be further improved and that the new nonlinear crystal is very suited to generate the high efficiency deep ultraviolet laser radiation below 266 nm. 相似文献
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We investigate the nonlinear optical interaction through a periodic waveguide structure consisting of two alternating segments with different linear and nonlinear optical properties. A coupled equation system has been used to calculate the intensity of fundamental and second harmonic waves and the phase shift of the fundamental. The model has been experimentally tested with good results, but the effect of the phase shift has not been considered. Comparison with the quasi-phase match (QPM) technique has been presented. The novel features introduced by alternating segments with different linear and nonlinear optical properties have been discussed. The model shows a more flexible approach, which can be used in designing optical components based on coherent nonlinear interaction. Applications are straightforward for frequency doubler and all-optical switch. 相似文献
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根据准相位匹配原理,对钼酸钆晶体用于准相位匹配倍频过程的周期性畴结构进行了设计,当入射基频光为l.064pm时,所需的钼酸钆晶体畴结构周期为5.54μm。利用外电场极化,当外电场为2.5kV/mm时,钼酸钆晶体的畴结构反转时间tc=500~600μs。当外电场脉冲幅值为2.5kV/mm、脉冲延续时间t=0.6~0.8tc时,在钼酸钆晶体中制备得到了周期畴结构。当Nd:YAG纳秒激光器输出准连续功率为7~10mW的l.064μm激光通过具有周期畴结构的样品时,获得了0.532μm的倍频光输出。 相似文献