光子学报, 2016, 45 (6): 0612004, 网络出版: 2016-07-26
复杂脉冲单发频域干涉测量
Analyzing Spectral Interferometer Fringe Using a Short Time Fourier Transform for Single Shot Complex Pulses Measurement
超快光学 超短脉冲测量 频域干涉测量法 窗口傅里叶变换 线性啁啾脉冲 Ultrafast optics Measurements of ultrashort pulses Spectral interferometry Short time Fourier transform Linear chirped pulse
摘要
以傅里叶变换极限脉冲作参考脉冲,利用单次测量分析法对复杂的皮秒脉冲进行测量,用窗口傅里叶变换代替傅里叶变换对干涉条纹进行时间-频率分析,直接提取出复杂脉冲的啁啾特性或光谱成分,将光谱图中的功率密度S(ω, t)沿ω轴求和重建脉冲的时域包络.分别用该方法和传统频域干涉测量法测量一个线性啁啾脉冲和一个复杂脉冲.结果表明,该方法可实现复杂整形脉冲的实时测量,且时间分辨率为70 fs.
Abstract
A single-shot measurement and analysis technique with a Fourier transform limited pulse as a reference pulse was presented, which can be used for measuring the complex picoseconds pulses. Substituting the Fourier transform with a short time Fourier transform, a time-frequency analysis of the spectral fringe was achieved to directly extract the chirp characteristics or composition of complex pulse. Furthermore, the temporal envelope of pulse was reconstructed from the spectrogram by summing the power density S(ω,t) along the spectrum ω axis. To verify the utility of this method, this method and the traditional spectral interferometry was used to measure a linear chirped pulse and a complex pulse respectively. The results show that this method can be used to measure the characterization of complex shaped pulses in real-time, and with a temporal resolution of 70 fs.
李雨, 李泽仁, 刘寿先, 李建中, 钟森城, 陈光华. 复杂脉冲单发频域干涉测量[J]. 光子学报, 2016, 45(6): 0612004. LI Yu, LI Ze-ren, LIU Shou-xian, LI Jan-zhong, ZHONG Sen-cheng, CHEN Guang-hua. Analyzing Spectral Interferometer Fringe Using a Short Time Fourier Transform for Single Shot Complex Pulses Measurement[J]. ACTA PHOTONICA SINICA, 2016, 45(6): 0612004.