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Directly phase-modulation-mode-locked doubly-resonant optical parametric oscillator.

Kavita Devi, S Chaitanya Kumar, M Ebrahim-Zadeh

    Optics Express
    |October 10, 2013
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    Summary

    Direct mode-locking of a doubly-resonant optical parametric oscillator (DRO) was achieved using a single electro-optic phase modulator. This method generates stable, ultrashort optical pulses for various applications.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Quantum Optics

    Background:

    • Doubly-resonant optical parametric oscillators (DROs) are crucial for generating tunable coherent light.
    • Achieving stable mode-locking in DROs is essential for applications requiring high peak power and short pulse durations.
    • Traditional mode-locking techniques can be complex and may require multiple components.

    Purpose of the Study:

    • To demonstrate direct mode-locking of a DRO using a single electro-optic phase modulator.
    • To investigate the generation of ultrashort optical pulses from the mode-locked DRO.
    • To analyze the influence of various parameters on the mode-locking performance and pulse characteristics.

    Main Methods:

    • Direct mode-locking of a MgO:sPPLT based DRO using an 80 MHz electro-optic phase modulator.
    • Pulsed output generation using a 532 nm continuous-wave (cw) laser pump source.
    • Systematic study of parameters including modulation frequency, modulation depth, pump power, crystal temperature, and modulator position.

    Main Results:

    • Stable mode-locked pulses with durations of 533 ps at 80 MHz and 471 ps at 160 MHz were generated.
    • Optimal mode-locking achieved at a modulation depth of 1.83 radians with precise frequency tuning and cavity length adjustment.
    • Signal-idler spectrum exhibited a bandwidth of ~31 nm at degeneracy, with spectral characteristics dependent on phase-matching temperature.
    • A 4-fold enhancement in green power was observed via second-harmonic generation, confirming mode-locked operation.

    Conclusions:

    • Direct mode-locking of a DRO is feasible and effective using a single electro-optic phase modulator.
    • The developed technique provides a stable and efficient method for generating ultrashort optical pulses.
    • The study offers valuable insights into optimizing DRO performance for various laser applications.