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Range00:59

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Efficient Raman converter in the yellow range with high spatial and spectral brightness.

Minh Châu Phan Huy, Philippe Delaye, Gilles Pauliat

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    A novel Raman converter using propan-2-ol achieves 67% efficiency at 583 nm. This sub-nanosecond system offers high spectral brightness, outperforming supercontinuum sources for laser applications.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Laser Technology

    Background:

    • Efficient generation of visible light is crucial for various applications.
    • Raman conversion offers a pathway to spectral tailoring of laser sources.
    • Sub-nanosecond pulsed lasers enable high peak power applications.

    Purpose of the Study:

    • To demonstrate a Raman converter emitting at 583 nm.
    • To achieve high conversion efficiency and spectral brightness in the visible range.
    • To characterize the performance of a sub-nanosecond Raman converter.

    Main Methods:

    • Utilized propan-2-ol as the Raman medium.
    • Employed a 532 nm sub-nanosecond microlaser as the pump source.
    • Adapted a photonic bandgap fiber using a liquid mixture for optimal transmission.

    Main Results:

    • Achieved 67% internal conversion efficiency in photon numbers at 583 nm (second Stokes order).
    • Generated an output power of 1.06 mW with a maximum peak power of 338 W.
    • Delivered a beam with Gaussian spatial structure and high spectral brightness, exceeding supercontinuum sources by over five times.

    Conclusions:

    • The developed Raman converter provides an efficient method for generating visible light at 583 nm.
    • The system's high spectral brightness makes it suitable for applications requiring high-quality visible laser sources.
    • This work demonstrates the potential of liquid-filled photonic bandgap fibers for efficient nonlinear frequency conversion.