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Highly efficient white light generation from barium fluoride.

A Dharmadhikari, F Rajgara, N C Reddy

    Optics Express
    |May 29, 2009
    PubMed
    Summary
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    Highly efficient white light generation was achieved using barium fluoride crystals and focused laser pulses. This method produced a broad spectrum of light with high efficiency and demonstrated coherent properties.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Broadband light generation is crucial for various scientific applications.
    • Nonlinear optical phenomena in crystalline materials offer pathways for light generation.

    Purpose of the Study:

    • To demonstrate highly efficient white light generation using barium fluoride (BaF2) crystals.
    • To investigate the spectral characteristics and coherence of the generated white light.

    Main Methods:

    • Focusing femtosecond (fs) laser pulses (800 nm, 1 mJ) onto a 10 cm barium fluoride crystal.
    • Utilizing line focusing geometry to study coherence properties.

    Main Results:

    • Achieved white light generation across the 400-1000 nm wavelength band.

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  • Obtained a conversion efficiency greater than 40% for white light generation.
  • Observed multiphoton absorption induced fluorescence and coherent white light fringes.

    • Conclusions:

    • Barium fluoride is an effective material for efficient, broadband white light generation via nonlinear optical processes.
    • The generated white light exhibits coherent properties, as evidenced by fringe formation.