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Tunable continuous-wave deep-ultraviolet laser based on Ce:LiCAF.

Barbara Wellmann, David J Spence, David W Coutts

    Optics Letters
    |April 3, 2014
    PubMed
    Summary
    This summary is machine-generated.

    We achieved deep-ultraviolet (UV) lasing at 290 nm using a chopped continuous-wave (CW) Ce:LiCAF laser. This method minimizes thermal effects, enabling efficient deep-UV light generation.

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    Area of Science:

    • Laser physics
    • Solid-state lasers
    • Deep-ultraviolet (UV) generation

    Background:

    • Continuous-wave (CW) lasers are crucial for various applications.
    • Cerium-doped lithium calcium aluminum fluoride (Ce:LiCAF) crystals offer broad tunability in the deep-UV range.
    • Thermal effects in laser materials can limit performance and efficiency.

    Purpose of the Study:

    • To demonstrate chopped-CW lasing in a Ce:LiCAF oscillator for direct deep-UV light generation.
    • To investigate a method for minimizing thermal effects in the laser system.
    • To achieve efficient and tunable deep-UV output.

    Main Methods:

    • Utilized asynchronous pumping of a Ce:LiCAF oscillator with a mode-locked, frequency-quadrupled Nd:YVO4 laser (266 nm, 23 ps pulses, 80 MHz repetition rate).
    • Employed a chopped pump laser with an 8.3% duty cycle to mitigate thermal issues.
    • Characterized the laser output power, slope efficiency, and tunability.

    Main Results:

    • Achieved chopped-CW lasing, directly generating deep-UV light around 290 nm.
    • Obtained a maximum output power of 384 mW with a slope efficiency of 33% at 3.3 W of pump power.
    • Demonstrated tunability from 286 to 295 nm, with potential for broader tuning (280–315 nm).

    Conclusions:

    • The chopped-CW pumping technique effectively minimizes thermal effects in Ce:LiCAF lasers.
    • Direct deep-UV generation around 290 nm is feasible with high efficiency.
    • The Ce:LiCAF laser system shows promise for applications requiring tunable deep-UV light sources.