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Efficient broadband second-harmonic generation by dispersive achromatic nonlinear conversion using only prisms.

B A Richman, S E Bisson, R Trebino

    Optics Letters
    |December 18, 2007
    PubMed
    Summary
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    Researchers efficiently doubled tunable fundamental light using a beta-barium borate crystal and a prism apparatus. This method achieved efficient second-harmonic generation over an 80 nm range without crystal angle tuning.

    Area of Science:

    • Nonlinear optics
    • Laser physics
    • Materials science

    Background:

    • Efficiently generating tunable laser light is crucial for various spectroscopic applications.
    • Second-harmonic generation (SHG) is a key nonlinear optical process for frequency conversion.
    • Beta-barium borate (BBO) crystals are widely used for SHG due to their favorable properties.

    Purpose of the Study:

    • To develop and demonstrate an efficient method for broadband second-harmonic generation.
    • To achieve efficient frequency doubling of tunable fundamental light without requiring crystal angle tuning.
    • To optimize a dispersive apparatus for collinear propagation of generated second-harmonic frequencies.

    Main Methods:

    • Utilized a lossless dispersive apparatus with six prisms to manage spectral dispersion.

    Related Experiment Videos

  • Employed a 4-mm-long type I beta-barium borate (BBO) crystal for second-harmonic generation.
  • Implemented a second set of six prisms to realign the second-harmonic frequencies for collinear propagation.

    • Main Results:

    • Achieved efficient doubling of tunable fundamental light near 660 nm over an 80 nm bandwidth.
    • Demonstrated broadband SHG without tuning the BBO crystal angle.
    • Obtained a conversion efficiency of 10% for a 40-mJ, 5-ns fundamental pulse.
    • Successfully realigned second-harmonic frequencies to be collinear within 1/4 spot diameter and 200 microrad.

    Conclusions:

    • The developed prism-based dispersive apparatus enables efficient broadband second-harmonic generation.
    • This technique offers a method for tunable frequency conversion without the need for crystal angle adjustments.
    • The results highlight the potential for improved laser system designs utilizing nonlinear optical processes.