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首页> 外文期刊>The European physical journal, D. Atomic, molecular, and optical physics >Field-free orientation of CO molecule by combining two-color femtosecond laser pulse with time-delayed positively chirped laser pulse
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Field-free orientation of CO molecule by combining two-color femtosecond laser pulse with time-delayed positively chirped laser pulse

机译：CO分子的无场取向通过将双色飞秒激光脉冲与时间延迟正啁啾激光脉冲组合

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摘要

The orientation of CO molecule controlled by two-color femtosecond laser pulse and positively chirped laser pulse is investigated theoretically. Compared with the single two-color or positively chirped laser pulse, the combination of two laser pulses with an optimized delay time can greatly improve the degrees of the positive and negative molecular orientation, respectively. The effects of intensity of two-color femtosecond laser pulse on molecular orientation are discussed, and the molecular orientation can be achieved by a calculated intensity. Additionally, the delay time between two-color femtosecond laser pulse and positively chirped laser pulse can significantly enhance the molecular orientation. Furthermore, by varying the carrier frequency and the chirp value of the positively chirped laser pulse, it is shown that the molecular orientation can be changed to some degree. The positive and negative molecular orientation can also be manipulated by adjusting the relative amplitude of the second harmonic field with respect to the fundamental.
机译：从理论上研究了由双色飞秒激光脉冲和正啁啾激光脉冲控制的CO分子的取向。与单色或正啁啾激光脉冲相比，两个激光脉冲的组合分别可以大大提高正和负分子取向的程度。讨论了两色艇飞秒激光脉冲强度对分子取向的影响，并且可以通过计算的强度实现分子取向。另外，双色飞秒激光脉冲和正啁啾激光脉冲之间的延迟时间可以显着提高分子取向。此外，通过改变正啁啾激光脉冲的载流子频率和啁啾值，示出了分子取向可以在某种程度上改变。通过调节第二谐波场相对于基本的相对幅度，也可以操纵正分子取向。

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