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Extreme midinfrared nonlinear optics in semiconductors.

A H Chin1, O G Calderón, J Kono

  • 1W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA.

Physical Review Letters
|May 1, 2001
PubMed
Summary

Intense mid-infrared pulses create extreme nonlinear optical effects in semiconductors, including multiple harmonics and sidebands. Cross-phase modulation is key to generating these novel phenomena.

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Area of Science:

  • Nonlinear Optics
  • Solid-State Physics
  • Quantum Optics

Background:

  • Semiconductors exhibit unique optical properties when interacting with intense light.
  • Mid-infrared (MIR) light offers novel pathways for exploring nonlinear optical phenomena.

Purpose of the Study:

  • To investigate extreme nonlinear optical phenomena generated by intense MIR pulses in semiconductors.
  • To characterize the nature and extent of these phenomena, including optical sidebands and harmonics.
  • To identify the underlying physical mechanisms driving these extreme nonlinear effects.

Main Methods:

  • Irradiation of semiconductor samples with intense mid-infrared (MIR) laser pulses.
  • Spectroscopic analysis to detect and quantify optical sidebands and harmonics.
  • Theoretical modeling to understand the role of cross-phase modulation.

Main Results:

  • Observed multiple off-resonance optical sidebands (up to +/-3 MIR photons interacting with a near-infrared photon).
  • Generated multiple MIR harmonics, up to the seventh harmonic.
  • Measured significant broadening and modification of MIR harmonic spectra.
  • Identified cross-phase modulation as the primary mechanism responsible for these phenomena.

Conclusions:

  • Intense MIR pulses can drive extreme nonlinear optical responses in semiconductors.
  • Cross-phase modulation is a crucial factor in generating multiple MIR harmonics and sidebands.
  • These findings open new avenues for light generation and manipulation in the mid-infrared spectrum.

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