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Nonlinear mirror modelocking of a bounce geometry laser.

G M Thomas1, A Bäuerle, D J Farrell

  • 1Photonics Group, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW, UK. gmt03@ic.ac.uk

Optics Express
|July 1, 2010
PubMed
Summary

We achieved the highest power using nonlinear mirror modelocking (NLM) in a bounce amplifier laser. This NLM technique, using KTP, reached 11.3W with 57ps pulses, rivaling SESAM modelocking.

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Area of Science:

  • Laser physics
  • Nonlinear optics
  • Materials science

Background:

  • Passive modelocking techniques are crucial for generating ultrashort laser pulses.
  • Nonlinear Mirror (NLM) modelocking offers an alternative to saturable absorber mirror (SESAM) modelocking.
  • Nd:GdVO(4) lasers are suitable for high-power applications.

Purpose of the Study:

  • Investigate nonlinear mirror modelocking (NLM) in a Nd:GdVO(4) bounce amplifier.
  • Achieve high-power, ultrashort pulse generation using NLM.
  • Compare performance using different nonlinear crystals.

Main Methods:

  • Utilized a Nd:GdVO(4) slab bounce amplifier.
  • Implemented nonlinear mirror (NLM) modelocking with a dichroic mirror and nonlinear crystals.

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  • Employed type-II phase-matched KTP and type-I phase-matched BiBO crystals.
  • Operated the laser at 1063nm.

    • Main Results:

    • Achieved 11.3W average power with 57ps pulse duration using type-II KTP.
    • Attained 7.1W average power with 5.7ps pulse duration using type-I BiBO.
    • Demonstrated NLM as a viable high-power modelocking technique.

    Conclusions:

    • Nonlinear mirror modelocking (NLM) is a powerful technique for high-power ultrashort pulse generation in bounce amplifier lasers.
    • The choice of nonlinear crystal (KTP vs. BiBO) influences pulse duration and output power.
    • NLM presents a competitive alternative to SESAM modelocking for demanding laser applications.