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    Researchers developed a high-efficiency optically pumped laser emitting 20 W of yellow light. This versatile laser offers tunable output and pulsed operation, crucial for scientific and medical fields.

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    Area of Science:

    • Optics and Photonics
    • Solid-State Lasers
    • Nonlinear Optics

    Background:

    • Optically pumped semiconductor disk lasers, also known as VECSELs (vertical-external-cavity surface-emitting lasers), are promising sources for high-power visible and infrared emission.
    • Efficient generation of yellow light (around 588 nm) from semiconductor lasers is challenging due to material limitations and optical conversion losses.

    Purpose of the Study:

    • To demonstrate a high-efficiency, optically pumped VECSEL emitting watt-level yellow light.
    • To achieve tunable output and pulsed operation for potential applications in astrophysics and medicine.

    Main Methods:

    • Utilized a semiconductor gain chip emitting in the near-infrared (1170-1180 nm) within a V-shaped external cavity.
    • Employed intra-cavity frequency doubling using a lithium triborate (LBO) crystal to convert near-infrared light to yellow light (588 nm).
    • Investigated both continuous wave (CW) and directly modulated pump laser operation for pulsed output.

    Main Results:

    • Achieved a maximum output power of 20 W at 588 nm.
    • Demonstrated a maximum conversion efficiency of 28% (pump to yellow output) in CW operation.
    • Tuned the yellow output over a bandwidth of approximately 26 nm.
    • Generated optical pulses with durations down to 570 ns by modulating the pump laser.

    Conclusions:

    • The developed VECSEL is a highly efficient source of high-power, tunable yellow light.
    • The capability for high-power pulsed operation, combined with watt-level output, makes this laser suitable for demanding applications.
    • Direct modulation of the pump laser offers a straightforward method for generating optical pulses with improved efficiency compared to CW operation.