CHARACTERIZATION OF ARBITRARY FEMTOSECOND PULSES USING FREQUENCY-RESOLVED OPTICAL GATING
CHARACTERIZATION OF ARBITRARY FEMTOSECOND PULSES USING FREQUENCY-RESOLVED OPTICAL GATING
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DOI：
10.1109/3.199311
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发表时间：
1993-02-01
影响因子：
2.5
通讯作者：
TREBINO, R
中科院分区：
文献类型：
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作者：
KANE, DJ;TREBINO, R
我们介绍了一种新的技术，我们称之为频率分辨光学门(FROG)，用于表征和显示任意飞秒脉冲。该方法简单、通用、带宽大，不需要参考脉冲。利用几乎任何瞬时的非线性光学效应，FROG涉及到测量作为两个输入脉冲之间延迟的函数的信号脉冲的频谱。由此产生的强度与频率和延迟的轨迹与脉冲的频谱图有关，这是一种包含时间和频率信息的直观转换。利用相位恢复的概念，我们证明了FROG迹产生了任意超短脉冲的全强度I(T)和相位Phi(T)，并且没有物理上显著的模糊性。我们认为，与声学问题类似，青蛙轨迹在许多方面与场本身一样是脉冲的有用表示。FROG的时间分辨率似乎只受非线性介质响应的限制。我们通过在BK-7玻璃中的电子克尔效应和几个MuJ，620 nm，线性啁啾，大约200飞秒的脉冲，演示了这种方法。
We introduce a new technique, which we call frequency-resolved optical gating (FROG), for characterizing and displaying arbitrary femtosecond pulses. The method is simple, general, broad-band, and does not require a reference pulse. Using virtually any instantaneous nonlinear-optical effect, FROG involves measuring the spectrum of the signal pulse as a function of the delay between two input pulses. The resulting trace of intensity versus frequency and delay is related to the pulse's spectrogram, a visually intuitive transform containing both time and frequency information. We prove, using phase retrieval concepts, that the FROG trace yields the full intensity I(t) and phase phi(t) of an arbitrary ultrashort pulse with no physically significant ambiguities. We argue, in analogy with acoustics problems, that the FROG trace is in many ways as useful a representation of the pulse as the field itself. FROG appears to have temporal resolution limited only by the response of the nonlinear medium. We demonstrate the method using self-diffraction via the electronic Kerr effect in BK-7 glass and few muJ, 620 nm, linearly chirped, approximately 200 fs pulses.