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  • Received: Mar. 2, 2020

    Accepted: May. 18, 2020

    Posted: Jun. 29, 2020

    Published Online: Jun. 29, 2020

    The Author Email: Ying Li (queenly@vip.sina.com)

    DOI: 10.1017/hpl.2020.24

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    Haizhe Zhong, Bin Hu, Saisai Hu, Shengying Dai, Ying Li, Dianyuan Fan. Efficient idler broadening via oppositely dual-chirped difference frequency generation[J]. High Power Laser Science and Engineering, 2020, 8(2): 02000e27

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High Power Laser Science and Engineering, Vol. 8, Issue 2, 02000e27 (2020)

Efficient idler broadening via oppositely dual-chirped difference frequency generation

Haizhe Zhong, Bin Hu, Saisai Hu, Shengying Dai, Ying Li, and Dianyuan Fan

Author Affiliations

  • International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Shenzhen University, Shenzhen518060, China

Abstract

Dual-chirped difference frequency generation (DFG) is an advantageous technique for generating the broadband mid-infrared (IR) idler wave, which is inaccessible by a population-inversion-based laser system. In principle, the generated idler wave may even suffer a spectrum broadening compared with the driving pulsed lasers if the pump and signal waves are oppositely chirped. However, broadband phase-matching is always the determining factor for the resulting efficiency and the bandwidth of the generated idler wave. In this study, specific to an oppositely dual-chirped DFG scheme, we derive the precondition to realize broadband frequency conversion, wherein a negative $(1/\unicode[STIX]{x1D710}_{p}-1/\unicode[STIX]{x1D710}_{i})/(1/\unicode[STIX]{x1D710}_{s}-1/\unicode[STIX]{x1D710}_{i})$, in terms of the correlation coefficient of the group velocity ($\unicode[STIX]{x1D70E}$), is necessary. However, most birefringence bulk crystals can only provide the required material dispersions in limited spectral regions. We show that the periodically poled lithium niobate crystal that satisfies an inactive Type-II (eo-o) quasi-phase-matching condition has a stable negative $\unicode[STIX]{x1D70E}$ and exerts the expected broadband gain characteristic across an ultra-broad idler spectral region $(1.7{-}4.0~\unicode[STIX]{x03BC}\text{m})$. Finally, we propose and numerically verify a promising DFG configuration to construct a tunable mid-IR spectrum broader based on the broadband phase-matched oppositely dual-chirped DFG scheme.

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