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Mode-locked deep ultraviolet Ce:LiCAF laser.

Eduardo Granados1, David W Coutts, David J Spence

  • 1MQ Photonics Research Centre, Department of Physics, Macquarie University, New South Wales 2109, Australia. granados@ics.mq.edu.au

Optics Letters
|June 3, 2009
PubMed
Summary
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We achieved mode-locked operation of a cerium-doped lithium calcium aluminum fluoride (Ce:LiCAF) oscillator, producing deep ultraviolet laser pulses at 291 nm. This demonstrates potential for new ultrafast lasers at these wavelengths.

Area of Science:

  • Laser physics
  • Ultrafast optics
  • Solid-state lasers

Background:

  • Synchronously pumped lasers are crucial for generating ultrashort pulses.
  • Deep ultraviolet (UV) light sources are valuable for various scientific applications.
  • Cerium-doped LiCAF (Ce:LiCAF) crystals offer broad gain bandwidths for tunable and ultrafast laser operation.

Purpose of the Study:

  • To investigate the mode-locked operation of a synchronously pumped Ce:LiCAF laser oscillator.
  • To characterize the output parameters of the generated deep UV laser pulses.
  • To assess the potential of Ce:LiCAF for ultrafast laser generation in the deep UV spectrum.

Main Methods:

  • Utilizing a synchronously pumped Ce:LiCAF oscillator configuration.
  • Operating the laser in the deep UV region.

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  • Measuring output power, pulse duration, and slope efficiency.

    • Main Results:

    • Achieved mode-locked operation centered at 291 nm.
    • Generated laser pulses with a duration of 6 picoseconds (ps).
    • Obtained a maximum output power of 52 mW with a 13% slope efficiency.

    Conclusions:

    • The Ce:LiCAF oscillator successfully operated in mode-locked regime in the deep UV.
    • The results highlight the capability of Ce:LiCAF to support ultrafast pulse generation.
    • This work paves the way for a new class of ultrafast lasers operating directly at deep UV wavelengths.