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Related Experiment Videos

Quasi-group-velocity matching using integrated-optic structures.

Jie Huang1, J R Kurz, Carsten Langrock

  • 1E L Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. jiehuang@stanford.edu

Optics Letters
|December 9, 2004
PubMed
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We developed a novel device to overcome group-velocity mismatch (GVM) in nonlinear frequency mixing. This innovation enhances the efficiency-bandwidth product of optical devices by using integrated delay lines to manage pulse timing.

Area of Science:

  • Photonics and Optics
  • Nonlinear Optics
  • Waveguide Devices

Background:

  • Group-velocity mismatch (GVM) limits the efficiency-bandwidth product in nonlinear frequency-mixing devices.
  • Existing methods struggle to simultaneously achieve high efficiency and broad bandwidth due to GVM.

Purpose of the Study:

  • To propose and demonstrate a novel device architecture for compensating GVM in nonlinear frequency mixing.
  • To enhance the efficiency-bandwidth product of optical frequency mixers.

Main Methods:

  • Integration of wavelength-dependent delay lines within a waveguide structure.
  • Periodic arrangement of quasi-phase-matching (QPM) gratings with precisely controlled time delays.
  • Experimental demonstration using a two-stage periodically poled lithium niobate (PPLN) waveguide.

Related Experiment Videos

Main Results:

  • Successful compensation of GVM using integrated delay lines.
  • Resynchronization of two ~150-fs pulses separated by 6 ps using a fixed delay line.
  • Fine control of relative pulse phase achieved via temperature tuning.

Conclusions:

  • The proposed technique enables optical frequency mixers with a superior efficiency-bandwidth product.
  • This method overcomes limitations of short gratings that are typically used to avoid GVM.
  • The device design is scalable to multiple stages for further performance improvements.