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Acousto-optic tunable second harmonic generation in periodically poled LiNbO3.

Zi-yan Yu1, Fei Xu, Fei Leng

  • 1Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, PR China

Optics Express
|July 8, 2009
PubMed
Summary

Acousto-optic tunable second harmonic generation in periodically poled lithium niobate allows for instant control over second harmonic waves. This method couples quasi-phase-matching with acousto-optic polarization rotation for tunable nonlinear optical effects.

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Area of Science:

  • Nonlinear Optics
  • Acousto-Optics
  • Materials Science

Background:

  • Second harmonic generation (SHG) is a key nonlinear optical process.
  • Controlling SHG efficiently remains a challenge.
  • Periodically poled lithium niobate (PPLN) is a suitable material for nonlinear optics.

Purpose of the Study:

  • To propose and investigate acousto-optic tunable SHG in PPLN.
  • To explore the coupling between quasi-phase-matching (QPM) and acousto-optic (AO) effects.
  • To demonstrate real-time manipulation of SHG properties.

Main Methods:

  • Utilizing PPLN for SHG with QPM.
  • Inducing acoustic waves via external transducers or self-generation.
  • Investigating the interaction between acoustic waves (phonons) and photons.

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  • Analyzing the influence of AO polarization rotation on QPM SHG.

    • Main Results:

    • Demonstrated coupled QPM SHG and AO polarization rotation.
    • Showcased the ability to tune SHG properties through AO interaction.
    • Confirmed that acoustic waves can scatter photons and alter polarization states.
    • Achieved instant manipulation of second harmonic wave intensity, polarization, and phase.

    Conclusions:

    • Acousto-optic tunable SHG in PPLN offers a novel method for controlling nonlinear optical processes.
    • The integrated AO and QPM effects provide dynamic tunability of SHG.
    • This technique enables real-time modulation of generated second harmonic light properties.