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Passively Q-switched diode-pumped Er:YAG solid-state laser.

Adrien Aubourg1, Julien Didierjean, Nicolas Aubry

  • 1Laboratoire Charles Fabry, Institut d'Optique, CNRS, Univ Paris-Sud, Palaiseau, France. adrien.aubourg@institutoptique.fr

Optics Letters
|March 19, 2013
PubMed
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This study presents the first passively Q-switched diode-pumped Erbium-doped Yttrium Aluminum Garnet (Er:YAG) laser. The laser operates at 1645 nm or 1617 nm, achieving significant pulse energy and short pulse durations.

Area of Science:

  • Solid-state laser physics
  • Quantum electronics
  • Materials science

Background:

  • Erbium-doped Yttrium Aluminum Garnet (Er:YAG) lasers are crucial for various applications, including medical and industrial uses.
  • Passively Q-switching offers a compact and efficient method for generating high-energy laser pulses.
  • Diode-pumping provides an efficient and scalable approach for exciting solid-state laser materials.

Purpose of the Study:

  • To demonstrate the first passively Q-switched diode-pumped Er:YAG laser.
  • To investigate the laser's performance at different wavelengths (1645 nm and 1617 nm).
  • To explore the influence of Cr:ZnSe saturable absorber transmission on laser output characteristics.

Main Methods:

  • Utilized a diode-pumped Er:YAG solid-state laser system.

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  • Employed a Chromium-doped Zinc Selenide (Cr:ZnSe) saturable absorber with varying initial transmissions (85% and 80%).
  • Operated the laser in both continuous-wave (CW) and passively Q-switched modes, analyzing parameters like pulse energy, duration, and repetition rate.

    • Main Results:

    • Achieved up to 10 W CW output at 1645 nm and 8 W at 1617 nm with 65 W pump power.
    • In Q-switched mode (40 W pump), 85% transmission Cr:ZnSe yielded 330 μJ pulses at 1645 nm (61 ns duration, 1460 Hz).
    • 80% transmission Cr:ZnSe resulted in 510 μJ pulses at 1617 nm (41 ns duration, 820 Hz), demonstrating wavelength tunability.

    Conclusions:

    • Successfully demonstrated the first passively Q-switched diode-pumped Er:YAG laser operating on the (4)I(13/2)→(4)I(15/2) transition.
    • The Cr:ZnSe saturable absorber enables efficient Q-switching and wavelength selection in the 1.6 µm region.
    • This development opens avenues for compact, high-performance Er:YAG lasers for diverse applications.