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Generation of Resonantly Enhanced Monochromatic High-Order Harmonics

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The interaction of an intense femtosecond laser with gas to produce high-order harmonics is an important ultrafast coherent light source. Our simulation shows that a mid-infrared femtosecond laser pulse can enhance the multi-photon resonance between the ground states and excited states of the atom by the ac Stark effect and generate high-brightness monochromatic high-order harmonic radiation. By solving the time-dependent Schr?dinger equation, we obtain unusual resonantly enhanced high-order harmonics below the threshold, the intensity of which is strongest at an optimal laser intensity. Further, the time-frequency analysis shows that the resonance enhancement is related to the second-order ac Stark effect in a high field, while insensitive to the laser wavelength. This new mechanism makes mid-infrared femtosecond laser pulses more conducive to the generation of ultra-fast monochrome ultraviolet/extreme ultraviolet light sources with high brightness and has important application prospects in condensed matter physics and materials science.

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汪丽:中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800中国科学院大学材料与光电研究中心, 北京 100049中国科学院大学, 北京 100049
薛金星:中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800中国科学院大学材料与光电研究中心, 北京 100049中国科学院大学, 北京 100049
曾志男:中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800
李儒新:中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800
徐志展:中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800



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Wang Li,Xue Jinxing,Zeng Zhinan,Li Ruxin,Xu Zhizhan. Generation of Resonantly Enhanced Monochromatic High-Order Harmonics[J]. Chinese Journal of Lasers, 2019, 46(10): 1001003

汪丽,薛金星,曾志男,李儒新,徐志展. 共振增强单色高次谐波产生[J]. 中国激光, 2019, 46(10): 1001003


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