978 resultados para Nd : YAG
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制备了三元GdFeCo合金薄膜和四元NdGdFeCo合金薄膜,测量了其磁饱和磁化强度对温度的依赖关系、磁滞回线以及可见光范围内的克尔谱.研究了轻稀土Nd掺杂对GdFeCo磁光薄膜的克尔旋转角的影响,发现在一定掺杂范围内能够有效提高薄膜在短波长下的克尔旋转角.掺入适量的轻稀土Nd可以使GdFeCo薄膜在短波长下的磁光性能提高,更好的适用于作为中心孔探测磁超分辨的短波长磁光读出层材料.
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采用面泵浦的CAMIL结构,我们研究了970 nm泵浦的Yb:YAG/YAG复合陶瓷薄片激光器,获得了连续和调Q的激光输出。在连续运转情况下,获得了最高1.05 W的激光输出,中心波长为1031 nm,后腔输出镜透射率为2%。我们同时获得了声光调Q的脉冲输出,重复频率从1 kHz到30 kHz,脉宽分别从166 ns到700 ns。
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利用自制高功率激光二极管(LD)列阵堆和波导整形抽运耦合系统,将抽运光耦合至Nd:YVO4板条晶体,平平腔运转得到了1.064μm的偏振激光输出。在最大抽运功率为84W时,透过率为10%的输出腔镜得到了31W的激光功率输出,光一光效率37%,斜效率45%,板条晶体两个方向的输出光束质量差别较大。为了进一步提高光束质量,使用柱面镜混合腔结构,在最大抽运功率为86W时,得到了19.3W的1064nm激光输出,测得的非稳腔和稳腔两个方向的M^2因子分别为1.4和1.7。
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报道了全固态激光器连续抽运高重复率电光调Q的实验和理论分析结果。用LGS(La3Ga5SiO14)晶体作电光调Q元件,在激光二极管(LD)端面抽运Nd:YVO4激光器中实现了较高重复率的电光调Q输出。实验中在10^4Hz重复率下,抽运功率为28w时,平均功率超过5W,脉冲宽度为7ns,峰值功率为70kW,并对不同重复率时的脉冲输出进行了比较,在低重复率下,脉宽〈6.5ns,峰值功率超过100kW。在理论上,通过对连续抽运时的电光调Q速率方程进行修正,并考虑放大自发辐射(ASE)的影响,对调Q激光器的储能过
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报道了采用带有微柱镜的激光二极管阵列(LDA)双侧面90°排布抽运的Yb:YAG板条激光器,实验中使用的激光晶体尺寸为6mm×10mm×1mm,掺杂原子数分数为3%。抽运光通过自行设计的聚光系统聚焦成10mm×1mm的光斑进行抽运,聚光系统的效率为75%,晶体表面功率密度达到1.9kW/cm^2,晶体内抽运光交叠区的体功率密度达到38kW/cm^3,远高于阈值的1.7kW/cm^3。当激光器采用平一凹腔结构,耦合输出为6%时激光单脉冲输出能量最高为25.5mJ,斜率效率为13%。插入声光调Q晶体后获得4.
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为了获得大功率高光束质量的激光输出,利用自制的5bar激光二极管阵列堆作为抽运源,抽运光经波导整形系统整形后入射至晶体,采用柱面镜混合腔结构,对部分端面抽运的混合腔Nd∶YVO4板条激光器进行了实验研究。在最高抽运功率134W时,得到了38W的连续激光输出,斜效率44%,测得的两个方向的M2因子为1.56和1.78。实验结果表明,该激光器具有极佳的热效应,能够在高功率运转时保持高光束质量的激光输出,输入-输出功率曲线没有出现平顶或弯曲的迹象,该激光器仍有提升潜力,本结果有助于进一步提升该激光器的性能,实现更高功率的高光束质量激光输出。
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部分端面抽运的混合腔板条激光器是一种新型的全固态激光器,采用这种结构,实现了高重复率调Q运转。在脉冲抽运情况下,1kHz运转时,得到脉宽4.6ns,单脉冲能量4.5mJ的激光输出。在连续抽运调Q输出情况下,5kHz高重复率运转时,获得了脉宽6ns,单脉冲能量3.1mJ的脉冲序列输出,平均功率超过15W;当重复率高达25kHz时,得到脉宽9.5ns,单脉冲能量1.2mJ的激光输出,平均功率达30W。实验结果表明,输出水平还有很大的提升空间。
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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。
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Nd-doped phosphate glass belt lasers pumped by laser diodes are demonstrated. The Nd-glass belt with a large cross-section and a small Fresnel number is air-cooled to provide around 18-W continuous wave (CW) output power with a beam quality factor of My2
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A novel dual-slab laser with off-axis one-sided hybrid resonator is presented. The mode properties of the hybrid resonator are calculated using a fast Fourier transform method (FFT). The influence of wavefront distoration on the output beam quality is considered. Results indicate that the novel dual-slab laser is better than the normal dual-slab laser with off-axis one-sided hybrid resonator.
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The heat generation in a flashlamp-pumped Nd:glass disk amplifier is studied by the simulation of the whole pumping process, which is based on the ray-tracing method. The results of temperature rise distribution as well as gain distribution are presented. The evolution of heat generation in disk during the pumping process is discussed in detail. Some main factors related with the thermal effect, such as the quantum efficiency, fluorescence lifetime, and pulse duration, are investigated through studying the ratio of the heat generation to energy storage in the gain medium. The influence of each parameter on heat generation is studied carefully, and the results provide ways to decrease the heat generation during the pumping process. (c) 2005 Society of Photo-Optical Instrumentation Engineers.