物理学报Issue(15)：1-9,9.DOI:10.7498/aps.62.154202
光谱扫描滤波法提升超强飞秒激光相干信噪比分析*
Theoretical analysis of scanning spectral filter method for coherent intensity contrast enhancement in femtosecond laser system*
摘要
Abstract
A scanning spectral filter method is proposed for improving the intensity contrast originating from the phase ripple in the fem-tosecond chains, which is made using the character that the instantaneous frequency varies with the time approximately linearly for the chirped pulse in the time-frequency domain. The scanning spectral filtering for reducing the pre-pulse and post-pulse intensity is analyzed in the time-frequency domain by using the short-time Fourier transformation method. Results show that the coherent intensity pulse contrast can be improved by 0.41F2 for the chirped pulse or the compressed pulse, and the transmission efficiency of the chirped pulse can exceed 90% when the synchronizing time of the jitter ranges from −2 ps to 2 ps and the chirp rate p from 0.9 C/T 2 to 1.1C /T 2.关键词
超快激光技术/相干信噪比/光谱扫描滤波/短时傅里叶变换法Key words
ultrafast optics/coherent pulse contrast/spectral scanning filtering/short time Fourier transformation引用本文复制引用
马再如,隋展,周桂勇,孙年春,王屹山,王向林,张彬,张蓉竹..光谱扫描滤波法提升超强飞秒激光相干信噪比分析*[J].物理学报,2013,(15):1-9,9.基金项目
国家高技术研究发展计划(批准号:2011AA1509)和四川省教育厅重点项目(批准号:2233443)资助的课题.* Project supported by the National High Technology Research and Development Program of China (Grant No.2011AA1509), and the Key Fund of Sichuan Provincial Department of Education, China (Grant No.2233443) （批准号:2011AA1509）
