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Related Experiment Videos

Simultaneously phase-matched enhanced second and third harmonic generation.

M Centini1, G D'Aguanno, M Scalora

  • 1INFM at Dipartimento di Energetica, Università di Roma "La Sapienza," Via Scarpa 16 00161 Roma, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 3, 2001
PubMed
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High harmonic generation in photonic band gap structures achieves efficient frequency conversion. This study demonstrates unique phase-matching conditions in finite layered structures, overcoming limitations of bulk materials.

Area of Science:

  • Nonlinear Optics
  • Photonics
  • Materials Science

Background:

  • Second and third harmonic generation are key nonlinear optical processes.
  • Photonic band gap (PBG) structures offer unique light manipulation properties.
  • Achieving high conversion efficiency in nonlinear processes often requires precise phase-matching.

Purpose of the Study:

  • To investigate second and third harmonic generation in a one-dimensional photonic band gap structure.
  • To explore the simultaneous achievement of enhanced and exact phase-matching conditions.
  • To demonstrate high conversion efficiencies under unusual tuning and phase-mismatch conditions.

Main Methods:

  • Utilizing a chi((2)) three-wave mixing process.
  • Designing a one-dimensional photonic band gap structure.

Related Experiment Videos

  • Balancing material dispersion and geometrical dispersion in finite layered structures.

    • Main Results:

    • High conversion efficiency for second and third harmonic generation was achieved.
    • Simultaneous enhancement and exact phase-matching for second harmonic and sum frequency generation (omega + 2 omega --> 3 omega) were demonstrated.
    • Remarkably high conversion efficiencies were maintained under phase-mismatch conditions.

    Conclusions:

    • One-dimensional photonic band gap structures enable efficient nonlinear frequency conversion.
    • Finite layered structures can achieve unusual phase-matching conditions not possible in bulk materials.
    • The interplay between material and geometrical dispersion is crucial for controlling nonlinear optical processes.