Measurement of the root-mean-square width and the root-mean-square chirp in ultrafast optics
Measurement of the root-mean-square width and the root-mean-square chirp in ultrafast optics
复制标题
超快光学中均方根宽度和均方根啁啾的测量
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
T. Brabec
中科院分区：
文献类型：
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作者：
E. Sorokin;G. Tempea;T. Brabec
基于两个定理，证明了均方根 (rms) 宽度对于表征超短光脉冲的重要性。首先，它表明人们可以直接从自相关确定均方根宽度，而无需对脉冲包络的具体形式做出任何假设。其次，结果表明带宽受限（非线性调频）波包具有最小可能的均方根时间带宽积。这揭示了均方根线性调频脉冲的自然定义，易于实验测量，并且为脉冲压缩技术的质量提供了有用的测量方法。
Based on two theorems, the importance of the root-mean-square (rms) width for the characterization of ultrashort optical pulses is demonstrated. First, it is shown that one can directly determine the rms width from the autocorrelation without making any assumptions about the specific form of the pulse envelope. Second, it is shown that a bandwidth-limited (unchirped) wave packet has the smallest possible rms time–bandwidth product. This reveals a natural definition for a rms chirp that is easily accessible to experimental measurement and that presents a useful measure for the quality of pulse compression techniques.