饱和功率密度下线性啁啾对交叉偏振波输出特性的影响
发布时间：2018-11-12 13:43
【摘要】：交叉偏振波(XPW)技术是一种基于具有各向异性特征的三阶非线性晶体的非线性滤波技术,由于结构简单,稳定可靠,是超强超快激光领域提高时域对比度、压缩脉宽的有效手段之一.在实验中发现,XPW的输出特性受驱动脉冲特性的直接影响,通过理论计算得到了XPW的脉宽和光谱宽度与驱动脉冲的啁啾特性关系,同时利用声光可编程色散滤波器设计实验对理论计算进行了验证.结果表明:实验结果很好地反映了理论计算得出的结论,同时在饱和功率密度条件下,还表现出了一些理论计算没有反映出的新现象,即XPW的光谱展宽突破了驱动脉冲宽度√3倍的限制,最终脉宽也能够压缩至小于入射脉宽的1/√3;此外对于相反线性啁啾的驱动脉冲所产生的XPW信号,其在光谱形状上有明显的偏移差异,同时输出效率也有所不同.最后对这些新现象进行了进一步的分析和理论解释.
[Abstract]:Cross-polarization wave (XPW) is a nonlinear filtering technique based on third-order nonlinear crystals with anisotropic characteristics. Because of its simple structure and reliability, cross-polarization wave (XPW) is used to improve the time-domain contrast in the field of ultra-fast laser. One of the effective means of compression of pulse width. In the experiment, it is found that the output characteristics of XPW are directly affected by the characteristics of the driving pulse. The relationship between the pulse width and spectral width of XPW and the chirp characteristics of the driving pulse is obtained by theoretical calculation. At the same time, the theoretical calculation is verified by the design experiment of acousto-optic programmable dispersion filter. The results show that the experimental results well reflect the conclusions of the theoretical calculation, and at the same time, under the condition of saturated power density, there are some new phenomena which are not reflected in the theoretical calculation. That is, the spectral broadening of XPW breaks through the limit of 3 times of the width of the driving pulse, and the final pulse width can be compressed to 1 / 3 of the width of the incident pulse. In addition, for the XPW signals generated by linearly chirped driving pulses, there is a significant shift in the spectral shape and the output efficiency is also different. Finally, further analysis and theoretical explanation of these new phenomena are carried out.
【作者单位】： 中国科学院物理研究所北京凝聚态物理国家实验室;北京信息科技大学仪器科学与光电工程学院;
【基金】：国家重点基础研究发展计划(批准号:2013CB922402) 国家重大科学仪器设备开发专项基金(批准号:2012YQ120047) 国家自然科学基金(批准号:11434016) 中国科学院战略性先导科技专项(批准号:XDB16030200)资助的课题~~
【分类号】：O437
，
本文编号：2327281
[Abstract]:Cross-polarization wave (XPW) is a nonlinear filtering technique based on third-order nonlinear crystals with anisotropic characteristics. Because of its simple structure and reliability, cross-polarization wave (XPW) is used to improve the time-domain contrast in the field of ultra-fast laser. One of the effective means of compression of pulse width. In the experiment, it is found that the output characteristics of XPW are directly affected by the characteristics of the driving pulse. The relationship between the pulse width and spectral width of XPW and the chirp characteristics of the driving pulse is obtained by theoretical calculation. At the same time, the theoretical calculation is verified by the design experiment of acousto-optic programmable dispersion filter. The results show that the experimental results well reflect the conclusions of the theoretical calculation, and at the same time, under the condition of saturated power density, there are some new phenomena which are not reflected in the theoretical calculation. That is, the spectral broadening of XPW breaks through the limit of 3 times of the width of the driving pulse, and the final pulse width can be compressed to 1 / 3 of the width of the incident pulse. In addition, for the XPW signals generated by linearly chirped driving pulses, there is a significant shift in the spectral shape and the output efficiency is also different. Finally, further analysis and theoretical explanation of these new phenomena are carried out.
【作者单位】： 中国科学院物理研究所北京凝聚态物理国家实验室;北京信息科技大学仪器科学与光电工程学院;
【基金】：国家重点基础研究发展计划(批准号:2013CB922402) 国家重大科学仪器设备开发专项基金(批准号:2012YQ120047) 国家自然科学基金(批准号:11434016) 中国科学院战略性先导科技专项(批准号:XDB16030200)资助的课题~~
【分类号】：O437
，
本文编号：2327281
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