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在千焦拍瓦高功率啁啾脉冲放大系统设计中,为了尽量消除增益窄化和增益饱和效应的影响,同时尽可能提高高功率激光输出脉冲信噪比参数,激光脉冲时空和光谱的整形问题备受关注.提出一种光谱整形新方法,利用特定结构的多层介质膜反射镜,可实现对大能量高功率啁啾脉冲钕玻璃放大系统中啁啾脉冲的光谱整形.研究结果表明,只要合理选择多层介质膜系的结构参数,可有效地控制其反射率分布,且在保证反射相位基本不变的条件下其调制度可超过60%.针对钕玻璃1053nm波长设计而成的光谱整形反射镜,反射带宽可达到196nm,色分辨率约为0.1nm,在几十纳米波长范围所对应的相位偏差小于12mrad,相当于λ/524,能够满足“神光Ⅱ”千焦拍瓦改造的技术指标要求.
In order to eliminate the influence of gain narrowing and gain saturation, try to improve the signal-to-noise ratio of high-power laser output pulse, the space-time of laser pulse and the shaping of spectrum in the design of high-power chirped pulse amplification system. A new method of spectral shaping is put forward.The spectroscopic shaping of the chirped pulse in the large energy high power chirped pulsed neodymium glass amplification system can be realized by using a special structured multilayer dielectric film mirror.The results show that, The reasonable choice of the structural parameters of multi-layer dielectric film system can effectively control the reflectivity distribution, and its modulation degree can exceed 60% under the condition of keeping the reflection phase substantially unchanged. The spectral shaping designed for 1053nm wavelength of neodymium glass The reflective mirror has a reflection bandwidth of 196 nm and a color resolution of about 0.1 nm. The phase deviation corresponding to the wavelength range of several tens of nanometers is less than 12 mrad, which is equivalent to λ / 524, which can meet the requirement of “SG 2” Technical indicators of the transformation requirements.