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Efficient second-harmonic generation with broadband laser pulses.

H S Kwok, P H Chiu

    Optics Letters
    |September 3, 2009
    PubMed
    Summary
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    Highly efficient second-harmonic generation (~10%) was achieved in potassium dihydrogen phosphate (KDP) crystals using a broadband dye laser. This unexpected efficiency is attributed to a frequency-mixing effect, enabling efficient generation of narrow-band tunable ultraviolet laser pulses.

    Area of Science:

    • Nonlinear optics
    • Laser physics
    • Materials science

    Background:

    • Second-harmonic generation (SHG) is a key nonlinear optical process for frequency conversion.
    • Potassium dihydrogen phosphate (KDP) is a widely used nonlinear optical crystal.
    • Broadband laser sources present challenges for efficient SHG due to spectral dispersion.

    Purpose of the Study:

    • To investigate the efficiency of SHG in KDP using a broadband dye laser.
    • To understand the underlying physical mechanisms responsible for the observed SHG efficiency.
    • To explore the potential for generating narrow-band tunable ultraviolet (UV) laser pulses.

    Main Methods:

    • Experimental setup utilizing a broadband dye laser source with a 1.4-nm bandwidth.
    • Second-harmonic generation experiments performed with KDP crystals.

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  • Spectral analysis of the generated second-harmonic output to determine bandwidth.

    • Main Results:

    • Observed unexpectedly high SHG efficiency of approximately 10% in KDP.
    • Measured a narrow second-harmonic output bandwidth of 0.21 nm.
    • Explained the high efficiency by a combination of simple frequency doubling and a frequency-mixing effect.

    Conclusions:

    • Broadband laser sources can achieve high SHG efficiency in KDP through frequency mixing.
    • The process allows for the generation of narrow-band tunable UV laser pulses.
    • This research opens possibilities for efficient UV light generation for various applications.