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Related Experiment Video

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Twisted-mode VECSEL with intracavity second harmonic generation.

D Mitten, Y Kaneda

    Optics Express
    |November 22, 2024
    PubMed
    Summary

    The twisted mode technique effectively scales power in vertical external cavity surface emitting lasers (VECSELs) with intracavity second harmonic generation (SHG). This method achieves 1 W of blue light (458 nm) without hindering SHG performance.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Vertical External Cavity Surface Emitting Lasers (VECSELs) are crucial for high-power laser applications.
    • Intracavity Second Harmonic Generation (SHG) is a common method for frequency conversion.
    • Power scaling of VECSELs is essential for advanced applications.

    Purpose of the Study:

    • To investigate the use of the twisted mode technique for power scaling in VECSELs with intracavity SHG.
    • To analyze the impact of the twisted mode technique on the VECSEL's mode structure and spectrum.
    • To determine the feasibility of combining twisted mode operation with intracavity frequency doubling.

    Main Methods:

    • Experimental setup of a VECSEL incorporating intracavity SHG.

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  • Implementation of the twisted mode technique to alter the fundamental mode characteristics.
  • Analysis of the fundamental mode's spatial profile and spectral properties.
  • Measurement of the second harmonic generation (SHG) output power and wavelength.

    • Main Results:

    • The twisted mode technique was successfully applied to the VECSEL.
    • Examination of the mode structure and spectrum confirmed the effects of the twisted mode technique.
    • A maximum SHG output of 1 W was achieved at 458 nm.
    • The fundamental laser operated in the TEM00 mode during maximum SHG output.

    Conclusions:

    • The twisted mode technique is compatible with intracavity SHG in VECSELs.
    • This technique offers a viable pathway for power scaling of intracavity frequency-doubled VECSELs.
    • The results demonstrate a promising approach for generating higher power blue light from VECSELs.