光学学报, 2008, 28 (s1): 118, 网络出版: 2008-08-16
高功率固体激光近场强度功率谱密度特性分析
Analysis of Near-Field Power Spectral Density in High-Power Solid-State Laser
非线性光学 高功率激光 近场 功率谱密度 中频对比度 特征频率 nonlinear optics high-power laser facility near-field power spectral density median-frequency contrast characteristic frequency
摘要
高功率固体激光驱动器的负载能力已经成为限制驱动器发展的瓶颈问题,负载能力研究的主要是激光束近场和光学元件的相互作用过程。采用功率谱密度(Power spectral density,PSD)方法分析了多程放大构型高功率固体激光驱动器实验输出近场强度的频谱在激光强度提升过程中的演变规律,分析了引起近场强度调制的主要因素。结果表明,高强度下,激光驱动器的输出近场存在明显的频谱特征,二维功率谱密度近似满足各向同性,近场调制主要源于小尺度自聚焦效应,PSD曲线显示获得增长的频率主要是各级空间滤波器截止频率所限定的频段。
Abstract
Load capability has become the bottle-neck in the progress of high-power solid-state laser facility, the research of which is mainly focusing on the interaction process of laser near-field and optics. Evolvement of experimental near-field intensity with the rise of laser intensity in a multiple-pass amplification laser driver has been researched by power spectral density (PSD). It is shown that, the near-field show obvious frequency-related characteristics, and two-dimensional PSD of near-field is isotropic. Modulation of near-field is due to small-scale self-focusing in high-intensity state. Growth of spatial frequency from PSD curve is mainly in the spatial frequency band, which is decided by the cut-off frequency of spatial filter pinhole.
赵军普, 胡东霞, 周维, 代万俊, 王文义, 粟敬钦, 彭志涛, 张昆, 蒋学君. 高功率固体激光近场强度功率谱密度特性分析[J]. 光学学报, 2008, 28(s1): 118. Zhao Junpu, Hu Dongxia, Zhou Wei, Dai Wanjun, Wang Wenyi, Su Jingqin, Peng Zhitao, Zhang Kun, Jiang Xuejun. Analysis of Near-Field Power Spectral Density in High-Power Solid-State Laser[J]. Acta Optica Sinica, 2008, 28(s1): 118.