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520-µJ mid-infrared femtosecond laser at 2.8 µm by 1-kHz KTA optical parametric amplifier


We report on a 520-µJ, 1-kHz mid-infrared femtosecond optical parametric amplifier system driven by a Ti:sapphire laser system. The seeding signal was generated from white-light continuum in YAG plate and then amplified in four non-collinear amplification stages and the idler was obtained in the last stage with central wavelength at 2.8 µm and bandwidth of 525 nm. To maximize the bandwidth of the idler, a theoretical method was developed to give an optimum non-collinear angle and estimate the conversion efficiency and output spectrum. As an experimental result, laser pulse energy up to 1.8 mJ for signal wave and 520 µJ for idler wave were obtained in the last stage under 10-mJ pump energy, corresponding to a pump-to-idler conversion efficiency of 5.2%, which meets well with the numerical calculation.

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This work was partially supported by the National Key Scientific Instruments Development Program of China (2012YQ120047), the National Natural Science Foundation of China under Grant Nos. 61575217 and 11774410, and the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No. XDB16030200

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Correspondence to Zhaohua Wang or Zhiyi Wei.

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This article is part of the topical collection “Mid-infrared and THz Laser Sources and Applications” guest edited by Wei Ren, Paolo De Natale and Gerard Wysocki.

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He, H., Wang, Z., Hu, C. et al. 520-µJ mid-infrared femtosecond laser at 2.8 µm by 1-kHz KTA optical parametric amplifier. Appl. Phys. B 124, 31 (2018).

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