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Related Experiment Videos

Direct quasi-phase-matched fourth-harmonic generation.

Xianfeng Chen1, Yuping Chen, Yuxing Xia

  • 1Institute of Optics and Photonics, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China. xfchen@sjtu.edu.cn

Applied Optics
|March 9, 2005
PubMed
Summary
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Researchers theoretically demonstrated direct fourth-harmonic generation (FHG) in periodically poled lithium niobate. This method achieves a wide 115 nm bandwidth for efficient light conversion, comparable to two-step processes.

Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Materials science

Background:

  • Quasi-phase-matching (QPM) is crucial for efficient nonlinear optical processes.
  • Periodically poled lithium niobate (PPLN) is a versatile material for QPM applications.
  • Fourth-harmonic generation (FHG) is a key process for generating shorter wavelengths from lasers.

Purpose of the Study:

  • To theoretically demonstrate direct fourth-harmonic generation (FHG) using a QPM configuration.
  • To investigate the wavelength dependence of QPM gratings for FHG.
  • To analyze the bandwidths of fundamental wavelength, temperature, and incident angle for the proposed FHG process.

Main Methods:

  • Theoretical demonstration of direct FHG.
  • Calculation of QPM grating period dependence on wavelength.

Related Experiment Videos

  • Numerical analysis of bandwidths (fundamental wavelength, temperature, incident angle).

    • Main Results:

    • A wide fundamental wavelength bandwidth of 115 nm was achieved near 3797 nm.
    • The required QPM period for this bandwidth is 9.73 micrometers.
    • Numerical calculations showed comparable conversion efficiency for direct QPM FHG and cascading QPM via two-step second-harmonic generation.

    Conclusions:

    • Direct FHG in PPLN is a viable and efficient method for generating short wavelengths.
    • The demonstrated wide bandwidth offers flexibility in laser source selection.
    • The efficiency is comparable to established two-step methods, simplifying optical setups.