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Self-Q-switched Nd:YVO4 microchip lasers.

R S Conroy, T Lake, G J Friel

    Optics Letters
    |December 18, 2007
    PubMed
    Summary

    Giant pulses, hundreds of times the continuous-wave (CW) level, were observed in neodymium-doped yttrium orthovanadate (Nd:YVO4) microchip lasers. These short pulses, under 2 nanoseconds, are explained by including gain effects in stable cavity formation.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Monolithic microchip lasers, particularly those utilizing neodymium-doped yttrium orthovanadate (Nd:YVO4), are crucial components in various laser applications.
    • Conventional gain switching in lasers typically explains pulsed operation, but does not account for extreme pulse intensities observed under specific conditions.
    • Understanding pulse formation mechanisms is vital for optimizing laser performance and developing novel laser functionalities.

    Purpose of the Study:

    • To investigate the phenomenon of giant pulse generation in continuous-wave (CW) pumped, monolithic Nd:YVO4 microchip lasers.
    • To identify the underlying physical mechanisms responsible for the observed giant pulses, which exceed conventional gain switching explanations.
    • To propose a theoretical framework incorporating gain-related effects for stable cavity formation that explains these extreme pulses.

    Main Methods:

    • Experimental observation of giant pulses using a CW-pumped, monolithic Nd:YVO4 microchip laser.
    • Characterization of pulse properties, including intensity (several hundred times CW level) and duration (less than 2 nanoseconds).
    • Theoretical modeling incorporating gain-related effects within a stable cavity formation framework.

    Main Results:

    • Observation of giant optical pulses with intensities significantly higher than the CW output level.
    • Measurement of ultrashort pulse durations, less than 2 nanoseconds.
    • Identification of giant pulse occurrence coinciding with the onset of oscillation in the second longitudinal mode.
    • Successful explanation of giant pulses by including gain-related effects in stable cavity formation.

    Conclusions:

    • Giant pulses in Nd:YVO4 microchip lasers are a distinct phenomenon not explained by conventional gain switching.
    • The onset of the second longitudinal mode oscillation plays a critical role in giant pulse generation.
    • A theoretical model considering gain effects in stable cavity formation accurately describes these observed giant pulses.
    • This research provides new insights into nonlinear optical phenomena in microchip lasers, enabling potential advancements in laser design and applications.

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