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Third-harmonic generation in relative-phase-controlled two-color laser field

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Abstract

We experimentally demonstrate third-harmonic generation (THG) by intense femtosecond laser pulse at a central wavelength of ∼800 nm superposed by its second harmonic in air. The third-harmonic signal shows a periodic modulation with a period of ∼0.67 fs when the delay between fundamental and second-harmonic wave is continuously changed. The periodic modulation of THG can be attributed to the interference of third-harmonic signals generated from a direct THG channel (3ω=ω+ω+ω) and a four-wave mixing (FWM) channel (3ω=2ω+2ω−ω). With high pump intensity, the fitting of the measured TH spectrum as a function of delay implies that the pump pulse undergoes a strong pulse splitting and self-phase modulation at the focus.

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Authors and Affiliations

  1. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai, 201800, China

    H. Xu, W. Chu, H. Xiong, Y. Fu, J. Yao, B. Zeng, J. Ni, Y. Cheng & Z. Xu

  2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China

    W. Chu, Y. Fu, J. Yao, B. Zeng & J. Ni

  3. Institute of Modern Optics, Nankai University, Key Laboratory of Opto-electronic Information Science and Technology, Education Ministry of China, Tianjin, 300071, China

    Y. Liu & W. Liu

  4. Centre d’Optique, Photonique et Laser (COPL) and Département de Physique, de Génie Physique et d’Optique, Université Laval, Québec, Québec, G1K 7P4, Canada

    S. L. Chin

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  1. H. Xu
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  2. W. Chu
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  3. Y. Liu
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  4. W. Liu
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  5. H. Xiong
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  9. J. Ni
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  10. S. L. Chin
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  11. Y. Cheng
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Correspondence to W. Liu.

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Xu, H., Chu, W., Liu, Y. et al. Third-harmonic generation in relative-phase-controlled two-color laser field. Appl. Phys. B 104, 909–912 (2011). https://doi.org/10.1007/s00340-011-4531-2

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  • DOI: https://doi.org/10.1007/s00340-011-4531-2

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