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High-bandwidth laser-pulse generator using continuous-wave lasers.

M P Dierking, W S McCormick

    Applied Optics
    |October 12, 2010
    PubMed
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    A novel laser pulse generator enables precise radiometric calibration of high-speed photodetectors. This device creates constant amplitude, shaped pulses from 15 ns to continuous wave, covering visible to far-infrared spectra.

    Area of Science:

    • Optical Engineering
    • Metrology
    • Laser Physics

    Background:

    • Accurate calibration of high-speed photodetectors is crucial for various scientific and industrial applications.
    • Existing methods for radiometric calibration often lack the flexibility to accommodate a wide range of pulse durations and spectral regions.

    Purpose of the Study:

    • To develop and characterize a versatile laser-pulse generator for transferring continuous-wave (cw) absolute radiometric calibrations to high-speed pulse photodetectors.
    • To enable calibration across a broad spectral range, from visible to far-infrared.

    Main Methods:

    • Utilizing a spinning polygon mirror within a ring cavity to modulate continuous-wave (cw) input lasers.
    • Implementing an all-reflective optical design for broad spectral operation.

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  • Generating laser pulses with constant amplitude and shape, variable from cw to 15-ns full-width at half-maximum (FWHM) Gaussian pulses.

    • Main Results:

    • Demonstrated generation of high-speed, constant-amplitude, constant-shape laser pulses.
    • Achieved temporal output flexibility ranging from cw to 15-ns FWHM Gaussian pulses.
    • Verified operational capability across visible to far-infrared spectral regions through design and performance estimates, supported by experimental verification.

    Conclusions:

    • The developed laser-pulse generator offers a robust solution for the radiometric calibration of high-speed photodetectors.
    • The device's versatility in pulse shaping and spectral coverage makes it suitable for diverse applications in optical metrology.