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Multiorder nonlinear diffraction in frequency doubling processes.

Solomon M Saltiel1, Dragomir N Neshev, Wieslaw Krolikowski

  • 1Nonlinear Physics Centre, CUDOS, Research School of Physics and Engineering, The Australian National University, Canberra ACT, Australia. saltiel@phys.uni-sofia.bg

Optics Letters
|March 14, 2009
PubMed
Summary
This summary is machine-generated.

We experimentally observed two distinct second-harmonic frequency-scattering processes in chi(2) nonlinear gratings. One process follows Raman-Nath diffraction, dependent on transverse phase matching, while the other relies solely on longitudinal phase matching.

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Area of Science:

  • Nonlinear optics
  • Condensed matter physics
  • Photonics

Background:

  • Chi(2) nonlinear gratings are crucial for frequency conversion.
  • Understanding light scattering mechanisms in these gratings is essential for device optimization.
  • Second-harmonic generation (SHG) is a key nonlinear optical phenomenon.

Purpose of the Study:

  • To experimentally investigate and differentiate the light scattering processes in chi(2) nonlinear gratings.
  • To analyze the underlying phase-matching conditions governing these scattering phenomena.
  • To characterize the angular dependence of nonlinear diffraction in these gratings.

Main Methods:

  • Experimental analysis of light scattering.
  • Observation and characterization of second-harmonic frequency-scattering.
  • Application of transverse and longitudinal phase-matching conditions for analysis.

Main Results:

  • Two distinct types of second-harmonic frequency-scattering processes were observed.
  • The first process identified as Raman-Nath type nonlinear diffraction, explained by transverse phase-matching.
  • The second process, insensitive to grating period, explained by longitudinal phase-matching only.

Conclusions:

  • The study successfully differentiated two nonlinear scattering mechanisms in chi(2) gratings.
  • Transverse phase-matching governs Raman-Nath diffraction, dependent on wavelength-to-grating period ratio.
  • Longitudinal phase-matching governs a separate scattering process, independent of the grating period.