4.5 Article

Watt-level continuous-wave and high-repetition-rate mid-infrared lasers based on a Er3+-doped Ca0.8Sr0.2F2 crystal

期刊

APPLIED PHYSICS EXPRESS
卷 12, 期 11, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.7567/1882-0786/ab4a95

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资金

  1. National Natural Science Foundation of China (NSFC) [11974220, 61635012]
  2. Development Projects of Shandong Province Science and Technology [2017GGX30102]
  3. National Key Research and Development Program of China [2016YFB0701002]
  4. Science and Technology Planning Project of Guangdong Province [2016B050501005]
  5. Science and Technology Innovation Commission of Shenzhen [KQTD2015032416270385]

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A 3 at% Er3+:Ca0.8Sr0.2F2 mixed crystal was grown successfully with a Ca:Sr molar ratio of about 4:1. This was applied as a laser gain medium and pumped by diode laser, obtaining a continuous-wave output power of 1.41 W with a slope efficiency of 39.2%, thus exceeding the Stokes limit by about 5%. Furthermore, with Mn+1XnTx (MXene) as a saturable absorber, passive Q-switched mode-locking operation was experimentally demonstrated for the first time, to the best of our knowledge. Mode-locked pulses under the Q-switched pulse envelope had a high repetition rate of 103.2 MHz at a center wavelength of 2,796.7 nm. (C) 2019 The Japan Society of Applied Physics

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