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High-power diode-end-pumped Tm:LiLuF4 slab lasers.

Xiaojin Cheng1, Shuaiyi Zhang, Jianqui Xu

  • 1Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China. xjcheng@siom.ac.cn

Optics Express
|August 19, 2009
PubMed
Summary

Diode-pumped thulium-doped lithium lutetium fluoride (Tm:LiLuF4) lasers achieved 10.4 W continuous-wave output and 8 mJ Q-switched pulse energy. These results demonstrate Tm:LiLuF4 as a promising material for efficient laser applications.

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Area of Science:

  • Laser Physics
  • Solid-State Lasers
  • Materials Science

Background:

  • Thulium-doped materials are crucial for generating laser light in specific wavelength ranges.
  • Lithium lutetium fluoride (LiLuF4) is an emerging host crystal for rare-earth doping.
  • Efficient diode-pumping is key for developing compact and high-power laser systems.

Purpose of the Study:

  • To demonstrate diode-end-pumped continuous-wave (CW) and acousto-optics Q-switched Tm:LiLuF4 slab lasers.
  • To evaluate the performance of a-cut Tm:LiLuF4 crystals at room temperature.
  • To characterize output power, pulse energy, and other key laser parameters.

Main Methods:

  • Utilized a-cut Tm:LiLuF4 slab with 2 at.% doping concentration.
  • Employed fast-axis collimated laser diodes for pumping at room temperature.

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  • Configured both continuous-wave and acousto-optics Q-switched laser cavities with a 30 mm length.

    • Main Results:

    • Achieved a maximum continuous-wave output power of 10.4 W with 31.6 W absorbed pump power.
    • Obtained a maximum Q-switched pulse energy of 8 mJ.
    • Recorded a Q-switched pulse width of 315.2 ns at a 1 kHz pulse repetition frequency.

    Conclusions:

    • Diode-end-pumped Tm:LiLuF4 slab lasers are effective for both CW and Q-switched operation.
    • The demonstrated performance highlights Tm:LiLuF4 as a viable material for high-power and pulsed laser generation.
    • Further research can explore optimization for specific laser applications.