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二次谐波频率分辨光学门(SHG-FROG)是能够准确测量短脉冲多项特性参量的新技术。利用二次谐波频率分辨光学门脉冲分析仪对在色散平坦光纤中传输前后的短脉冲进行了测量,得到了待测光脉冲的频率分辨光学门(FROG)图、自相关曲线、自相关频谱曲线、波形和相位曲线以及脉宽、谱宽、啁啾等反映短脉冲特性的信息,对实验结果进行了分析,并与高斯脉冲在单模光纤中的线性传输理论进行了比较。结果表明,激光器输出的短脉冲是具有负线性啁啾的近变换极限高斯脉冲,经过12.7 km色散平坦光纤传输后仍然为具有负线性啁啾的高斯脉冲,其谱宽在传输过程中基本保持不变,脉宽展宽了3.1倍,啁啾增大了4倍。实验测量结果和理论预期一致。
The second harmonic frequency-resolved optical gate (SHG-FROG) is a new technology that can accurately measure many characteristics of short pulses. The short-pulse before and after transmission in the dispersion-flattened fiber was measured by the second harmonic frequency-resolved optical gate pulse analyzer, and the frequency-resolved optical gate (FROG) plot of the light pulse to be measured, the autocorrelation curve, the autocorrelation spectrum The experimental results are analyzed and compared with the linear transmission theory of Gaussian pulse in single mode fiber. The results show that the pulse width, the spectral width, the phase curve, the pulse width, the spectral width and the chirp reflect the characteristics of the short pulse. The results show that the short pulse output by the laser is a nearly transposed limit Gaussian pulse with a negative linear chirp, which is still a Gaussian pulse with a negative linear chirp after 12.7 km dispersion flattened fiber transmission. The spectral width remains almost unchanged during the transmission Variable pulse width broadened 3.1 times, chirp increased 4 times. The experimental results are in line with the theoretical expectation.