Chinese Optics Letters, Volume. 23, Issue 7, 071403(2025)

Spectroscopic characterization and efficient tunable lasers of Ho:BaF2 single crystals

Xinyu Qian1... Ning Zhang1,2, Wudi Wang1, Qingsong Song1, Yanyan Xue3,**, Song Wang4, Feng Wu1, Chenbo Zhang1, Huili Tang1, Xiaodong Xu2, Yongguang Zhao2,5, Qingguo Wang1,* and Jun Xu1 |Show fewer author(s)
Author Affiliations
  • 1MOE Key Laboratory of Advanced Micro-Structured Materials, School of Physics Science and Engineering, Institute for Advanced Study, Tongji University, Shanghai 200092, China
  • 2Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
  • 3State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
  • 4School of Physical Sciences, University of California, Irvine CA 92697, America
  • 5State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China
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    Figures & Tables(10)
    Photographs of (a) the as-grown Ho:BaF2 crystal and (b) processed and polished Ho:BaF2 crystals.
    Schematic of the Ho:BaF2 crystal laser. M1, M2, folding mirrors; M3, high reflective mirror; LF, Lyot filter inserted at Brewster’s angle; OC, output coupler.
    Room temperature XRD pattern of the powdered Ho:BaF2 crystal.
    Room temperature absorption cross-section of the Ho:BaF2 crystal.
    (a) Room temperature emission cross-section of the Ho:BaF2 crystal and (b) fluorescence decay curve of the 5I7 level in the Ho:BaF2 crystal.
    Relationship between the quality factor Q and the wavelength for Ho:BaF2 and other Ho3+ ion-doped gain media.
    Calculated gain cross-section of the Ho:BaF2 crystal.
    (a) Relationship between output power and absorbed pump power at different Toc and (b) laser spectra with Toc = 5% of the Ho:BaF2 crystal.
    Wavelength tuning curve of the Ho:BaF2 crystal with Toc = 0.5% and Toc = 1%.
    • Table 1. Pulse Widths, CW Output Powers, and Tuning Ranges of the Ho:BaF2 Crystal and Other Gain Media

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      Table 1. Pulse Widths, CW Output Powers, and Tuning Ranges of the Ho:BaF2 Crystal and Other Gain Media

      Gain mediumOutput power(W)Tuning range (nm)Pulse widthRef.
      Ho:BaF21.5134 (Toc = 1%)166.2 (Toc = 0.5%)Next workThis work
      Ho:YAG1.1360[55]
      Ho:SrF21.062779 ns[54]
      Ho:CaF21.1160[25]
      Ho:CYA11.345[57]
      Ho:BSO0.73[60]
      Ho:SSO110[65]
      Ho:YLF0.542.5[62]
      Ho:silica fiber4.3160[61]
      Ho:All-fiber255[63]
      Ho:glass fiber18.3128[64]
      Tm,Ho:SrF20.58144.2246 fs[26]
      Tm,Ho:fiber60150 fs[66]
      Tm,Ho:CYLA0.51123.4560 ns[67]
      Tm,Ho:YAP93.5[68]
      Tm,Ho:LLF1855 ns[69]
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    Xinyu Qian, Ning Zhang, Wudi Wang, Qingsong Song, Yanyan Xue, Song Wang, Feng Wu, Chenbo Zhang, Huili Tang, Xiaodong Xu, Yongguang Zhao, Qingguo Wang, Jun Xu, "Spectroscopic characterization and efficient tunable lasers of Ho:BaF2 single crystals," Chin. Opt. Lett. 23, 071403 (2025)

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    Paper Information

    Category: Lasers, Optical Amplifiers, and Laser Optics

    Received: Jan. 2, 2025

    Accepted: Feb. 19, 2025

    Published Online: Jun. 11, 2025

    The Author Email: Yanyan Xue (xueyanyan@mail.sic.ac.cn), Qingguo Wang (qgwang@tongji.edu.cn)

    DOI:10.3788/COL202523.071403

    CSTR:32184.14.COL202523.071403

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