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Pump-induced lensing in Nd:YVO4 using transient wavefront measurements.

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    This summary is machine-generated.

    This study quantifies thermal and population lensing in diode-pumped neodymium-doped yttrium vanadate (Nd:YVO4) lasers. Direct measurements using a wavefront sensor distinguish these effects, crucial for high-power laser development.

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    Area of Science:

    • Laser physics
    • Solid-state laser technology
    • Optical engineering

    Background:

    • Pump-induced lensing is critical for scaling solid-state laser power while maintaining beam quality.
    • The relative contributions of thermal lensing and excited-state population lensing are not fully understood.
    • Accurate characterization of these lensing effects is essential for advanced laser amplifier design.

    Purpose of the Study:

    • To directly measure and differentiate transient thermal and population lensing in diode-pumped Nd:YVO4 amplifiers.
    • To quantitatively assess the contributions of thermal and population lensing under lasing and non-lasing conditions.
    • To determine the difference in polarizability between excited and ground states of Nd:YVO4.

    Main Methods:

    • Utilized a time-gated wavefront sensor for direct measurement of transient dioptric lensing.
    • Employed pulsed pump-probe measurements to analyze the time signatures of lensing mechanisms.
    • Compared experimental results with analytical theory for quantitative analysis.

    Main Results:

    • Successfully distinguished thermal and population lensing based on their distinct temporal responses.
    • Provided quantitative data on the absolute and relative contributions of thermal and population lensing.
    • Observed increased thermal lensing in higher-doped Nd:YVO4 samples due to energy transfer upconversion (ETU).

    Conclusions:

    • Established a method to directly measure and differentiate transient lensing mechanisms in laser gain media.
    • Quantified the difference in polarizability of the excited and ground states in Nd:YVO4 as approximately 7.7 x 10^-32 m^3.
    • The findings offer crucial insights for optimizing solid-state laser amplifiers for high power and beam quality.