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带受激布里渊散射池的位相共轭激光器输出的空间特性 总被引:1,自引:1,他引:0
本文应用传输矩阵的方法对受激布里渊散射位相共轭腔输出的空间特性进行了分析及编程计算,给出了各种参数下受激布里渊散射-位相共轭腔的传输光束轮廓图,同时给出了实验结果与之相比较,提出了设计受激布里渊散射共轭腔时应注意的问题及几种实用的受激布里渊散射位相共轭腔的腔型。 相似文献
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研究了温度对掺杂铌酸锂晶体位相共轭的影响,实验表明,温度是提高位相共轭波前反射率的一种有铲途径,并用全息光栅理论对此作了解释。 相似文献
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利用KNSBN掺Cu晶体实现了自泵浦位相共轭;掺Cu量0.04wt%的晶体自泵浦位相共轭反射率高达65%;测量了自泵浦位相共轭反射率,响应时间和氩离子激光波长的关系。 相似文献
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本文报道用布里渊增强四波混频改善受激布里渊系统位相共轭度的实验研究,与一般配置SBS相比,系统位相共轭度从0.58提高到0.78。 相似文献
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一、引言当位相共轭镜(PCM)与一具任意形状和连贯性的散射体相互作用时,具有修正波场畸变的显著特点。所用散射体完全无损耗,该位相共轭镜对入射到其上面的任何场都具有全反射的特点,位相产生共轭,而振幅不变,这就是所谓的位相共轭镜的恢复效应,已有许多工作者对此进行了实验 相似文献
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自泵浦位相共轭反射的实验研究 总被引:1,自引:1,他引:0
本文通过检测BaTiO_3晶体的二波耦合增益系数P和自泵浦位相共轭反射率R对随入射角的变化关系,经过理论分析指出R的角度依赖性是P的角密依赖性的结果;详细地解释了全内反射自泵浦位相共轭的双区域耦合理论,指出位相共轭输出的频移特性是泵浦光在双区域间“振荡”的结果;并解释了自泵浦形成的阈值特性。 相似文献
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KNSBN:Co晶体自泵浦位相共轭特性的研究 总被引:3,自引:3,他引:0
本文报道在两块不同尺寸的KNSBN:Co晶体中实现了自泵浦位相共轭输出,通过实验验证了位相共轭反射率与入射角、入射位置以及波长有关,并给出各自的实验曲线.保持激光器工作波长为514.5nm不变,在大块晶体中可得到高达73.0%的位相共轭反射率.文章还给出共轭光的形成时间随系统光强变化关系的实验曲线,并指出自泵浦形成时透射光强和晶体表面反射光强的时间变化特性,解释了自泵浦形成的阈值特性. 相似文献
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Aimed at solving the problem of the asymmetry of the output beam of corner-pumped solid-state fundamental-mode lasers, a simple resonant cavity design is presented. Using this method, no optical element needs to be inserted into the cavity. The symmetry of the output beam can be improved effectively by changing cavity parameters. The validity of this method is demonstrated by a corner-pumped Nd:YAG/YAG composite slab Q-switched fundamental-mode laser. The asymmetry of the output beam can be corrected effectively by adjusting the short arm length of the linear cavity and a symmetric output beam is obtained. The resonant cavity design method is simple and practical, which also applies to other lasers with the asymmetric output beam resulting from asymmetric cooling or asymmetric pumping. 相似文献
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对激光二极管端面泵浦Cr4+∶YAG被动调Q Nd∶YAG激光器输出特性进行了实验研究.实验研究发现,激光器输出功率及脉冲重复频率随谐振腔长度增大而增大.为解释这一实验现象,测量了泵浦光斑在激光晶体内尺寸,同时计算了激光晶体及Cr4+∶YAG晶体内的基模激光光斑半径随谐振腔长度变化.分析结果表明:激光晶体内泵浦光斑尺寸远小于激光晶体内基模光斑半径,腔模间交叠效率较低;当腔长增加时,激光晶体内的基模激光光斑减小,腔模间交叠效率增加,从而导致输出功率及脉冲重复频率随腔长增加而增加;另外,Cr4+∶YAG晶体内光斑半径也随谐振腔长度减小,引起Cr4+∶YAG晶体漂白时间缩短,导致脉冲重复频率随腔长增加而增加. 相似文献
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The anti-misalignment stability and output characteristics of the right angle cone cavity laser are experimentally studied. When the misalignment angle of the cone mirror turns to 46.8 minutes, the single-pulse output energy of the plano-cone cavity laser decreases 24% and the near-field beam patterns have little change; as for the beam directional stability, when the measuring place stands 3.12 m in front of the output mirror, the near-field beam patterns of the plano-cone laser are located at the primary places until the misalignment angle of the cone mirror turns to 18 minutes. These results show that the plano-cone cavity laser has better performances in comparison with the plano-concave cavity laser. The analytical results of the mode instrument are also obtained, which show that the near-field beam intensity distribution of the plano-cone mirror cavity laser is near to the plane wave. 相似文献
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利用有限元分析法结合Fox-Li迭代法,考虑腔内本征模式与腔镜热形变的相互耦合作用,计算模拟了正支共焦非稳腔的本征模式分布,定量分析了高功率激光器腔镜热变形对输出光束质量的影响,重点讨论了腔镜热变形所引起的腔内本征模式相位特性的变化,并从波前功率谱密度、Zernike像差系数及光束质量值等角度对腔镜发生热形变前后的激光器输出光束的光束特性进行比较分析。研究结果表明:高功率激光器腔镜热形变对输出光束的光束质量会产生一定的影响,且随着激光输出功率的增大,镜面热形变引起的输出光束波前相位高频比例及Zernike高阶像差均会有所增大,波前畸变程度也明显变大,光束质量逐渐变差。 相似文献
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利用有限元分析法结合Fox-Li迭代法,考虑腔内本征模式与腔镜热形变的相互耦合作用,计算模拟了正支共焦非稳腔的本征模式分布,定量分析了高功率激光器腔镜热变形对输出光束质量的影响,重点讨论了腔镜热变形所引起的腔内本征模式相位特性的变化,并从波前功率谱密度、Zernike像差系数及光束质量值等角度对腔镜发生热形变前后的激光器输出光束的光束特性进行比较分析。研究结果表明:高功率激光器腔镜热形变对输出光束的光束质量会产生一定的影响,且随着激光输出功率的增大,镜面热形变引起的输出光束波前相位高频比例及Zernike高阶像差均会有所增大,波前畸变程度也明显变大,光束质量逐渐变差。 相似文献
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对激光二极管端面泵浦Cr4+:YAG被动调QNd:YAG激光器输出特性进行了实验研究.实验研究发现,激光器输出功率及脉冲重复频率随谐振腔长度增大而增大.为解释这一实验现象,测量了泵浦光斑在激光晶体内尺寸,同时计算了激光晶体及Cr4+:YAG晶体内的基模激光光斑半径随谐振腔长度变化.分析结果表明:激光晶体内泵浦光斑尺寸远小于激光晶体内基模光斑半径,腔模间交叠效率较低;当腔长增加时,激光晶体内的基模激光光斑减小,腔模间交叠效率增加,从而导致输出功率及脉冲重复频率随腔长增加而增加;另外,Cr4+:YAG晶体内光斑半径也随谐振腔长度减小,引起Cr4+:YAG晶体漂白时间缩短,导致脉冲重复频率随腔长增加而增加. 相似文献
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Lizhi Dong Wenjin Liu Ping Yang Bing Xu Xiang Lei Yu Ning Hu Yan 《Optics Communications》2011,284(7):2003-2006
Misalignment of a laser cavity would result in the displacement of beam location on the cavity mirrors. We present a simple method for automatic cavity alignment of a solid-state laser through detecting the location of the laser beam on the rear mirror, with which neither external alignment beams nor modifications to the cavity are required. The rear mirror of the laser cavity is replaced by a tip/tilt mirror to compensate for the misalignment. Experiments show that this method could effectively correct the misalignment of the laser cavity and restore the output power to almost the original value when the resonator is well aligned. 相似文献
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M.N. Nenchev 《Optics Communications》1984,50(1):36-40
A novel and simple laser cavity configuration is proposed in which the two output beams of the active medium are dispersed by only one wavelength selective element. This configuration permits complete elimination of background superluminescene reinjection in active medium, additional linewidth narrowing and extention of the spectral tuning range. An experimental check on the example of the second harmonic of a YAG:Nd3+ pumped dye laser is reported. 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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We have developed a novel and compact six-mirror cavity configuration to combine four multimode laser modules intracavity
for energy scaling. Compared to the conventional 2×N channel scaling schemes, this close-ended six-mirror cavity is simpler,
more stable and more practical. Diode-side-pumped rod laser geometry that is appropriate for beam combination is employed
in the branch laser module. The characteristics of the output energy and the beam quality are investigated experimentally.
With the six-mirror cavity, the output brightness is significantly improved compared to single F–P cavity laser. A single
beam output exceeding 453 mJ with 165 μs duration is achieved, with the combination efficiency of 90.7%.
PACS 42.60.Da; 42.60.Jf; 42.60.By 相似文献