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Non-critical phase matching KTiOAsO4 optical parametric oscillator with a RISTRA cavity at 300  Hz.

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    Applied Optics
    |March 17, 2026
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    Summary

    A novel rotated image singly-resonant twisted rectangular (RISTRA) resonator in a KTA optical parametric oscillator (OPO) significantly improves beam quality. This RISTRA cavity enhances mode discrimination, leading to superior beam quality in non-critical phase-matching configurations.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Optical Engineering

    Background:

    • Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
    • Spatial walk-off in critically phase-matched OPOs degrades beam quality.
    • Non-critical phase-matching (NCPM) configurations minimize walk-off but require effective mode control.

    Purpose of the Study:

    • To investigate the effectiveness of a rotated image singly-resonant twisted rectangular (RISTRA) resonator in a NCPM KTA OPO.
    • To assess the impact of the RISTRA cavity on beam quality and mode discrimination.
    • To compare RISTRA cavity performance against traditional planar ring cavities.

    Main Methods:

    • Implementation of a RISTRA resonator in a potassium titanyl arsenate (KTA) OPO operating in NCPM.
    • Characterization of output energy and beam quality (M² factor) for both RISTRA and planar ring cavities.
    • Analysis of mode discrimination properties influenced by the 90° image rotation per round trip.

    Main Results:

    • The RISTRA cavity achieved comparable signal (50.3 mJ) and idler (15.5 mJ) energies to a planar ring cavity (54.0 mJ signal, 18.2 mJ idler).
    • Significant improvement in beam quality was observed: signal M² improved from 4.7×4.4 to 2.9×2.8, and idler M² improved from 4.7×6.4 to 2.5×2.5.
    • The RISTRA cavity effectively suppressed higher-order transverse modes, enhancing mode discrimination.

    Conclusions:

    • The RISTRA resonator is effective for enhancing beam quality in NCPM OPOs, even with negligible spatial walk-off.
    • The 90° image rotation per round trip is key to improved mode discrimination and reduced higher-order modes.
    • RISTRA cavities offer a viable alternative for achieving high-quality output in KTA OPOs.