Tuning the frequency of few-cycle femtosecond laser pulses by molecular phase modulation.
Tuning the frequency of few-cycle femtosecond laser pulses by molecular phase modulation.
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DOI：
10.1364/oe.17.001472
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发表时间：
2009-02
期刊：
影响因子：
3.8
通讯作者：
Fengjiao Zhong;Hongbing Jiang;Q. Gong
中科院分区：
文献类型：
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作者：
Fengjiao Zhong;Hongbing Jiang;Q. Gong
我们从理论上证明了如何利用分子排列引起的时间相关相位调制来连续调谐几个周期的飞秒激光脉冲的频率。利用N（2）中的脉冲激励排列，初始波长为800 nm，5 fs的高斯脉冲的中心波长可以从324.6 nm调谐到4237.3 nm。通过预发射另一束强度为3.5 × 10 ~（13）Wcm ~（-2）的800 nm，100 fs线偏振激光脉冲，获得了N（2）分子的定向排列。经过理想啁啾补偿后，频率调谐脉冲中包含的光周期数几乎不变。
We demonstrate theoretically how the time-dependent phase modulation induced by molecular alignment can be used to tune the frequency of few-cycle femtosecond laser pulses continuously. Using impulsively excited alignment in N(2), the central wavelength of an initial 800 nm, 5 fs Gaussian pulse can be tuned from 324.6 to 4237.3 nm. The aligned N(2) molecules are obtained by pretransmitting another 800 nm, 100 fs linearly polarized laser pulse of intensity 3.5x10(13) Wcm(-2). The number of optical cycles contained in the frequency-tuned pulse is almost unchanged after ideal chirp compensation.