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Bidirectional, synchronously pumped, ring optical parametric oscillator.

X Meng, J C Diels, D Kuehlke

    Optics Letters
    |November 28, 2007
    PubMed
    Summary
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    We demonstrate a bidirectional femtosecond ring optical parametric oscillator using lithium niobate. This device shows a gyro response without dead band, proving its sensitivity to phase changes.

    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Laser Physics

    Background:

    • Ring optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
    • Bidirectional operation in OPOs can enable novel sensing applications.
    • Periodically poled lithium niobate (PPLN) is a key material for nonlinear optical frequency conversion.

    Purpose of the Study:

    • To report the operation of a bidirectional femtosecond pulsed ring OPO.
    • To demonstrate a gyro response without dead band using this device.
    • To measure the nonlinear index of lithium niobate.

    Main Methods:

    • Utilized a periodically poled lithium niobate (PPLN) crystal.
    • Pumped the OPO alternately with nonsimultaneous femtosecond pulses from a Ti:sapphire laser.

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  • Observed a beat note between counterpropagating beams to confirm gyro response.

    • Main Results:

    • Successfully operated a bidirectional femtosecond pulsed ring OPO.
    • Confirmed a gyro response without dead band.
    • Demonstrated sensitivity to differential phase changes via nonlinear index measurement.

    Conclusions:

    • The bidirectional femtosecond ring OPO based on PPLN operates effectively.
    • The device exhibits a robust gyro response suitable for sensing.
    • This work validates the use of PPLN in advanced OPO designs and sensing.