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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
Published on: February 25, 2017
Multimode anharmonic third-order harmonic generation in a photonic-crystal fiber
A A Ivanov1, D Lorenc, I Bugar
1International Laser Center, M. V. Lomonosov Moscow State University, Vorob'evy gory, 119992 Moscow, Russia.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 21, 2006
Summary
Frequency tripling of ultrashort laser pulses generates spectral peaks shifted from the expected frequency. This phenomenon in photonic-crystal fibers allows for engineering the third-harmonic signal
Area of Science:
- Nonlinear Optics
- Quantum Optics
- Laser Physics
Background:
- Third-harmonic generation (THG) from monochromatic light occurs at precisely three times the fundamental frequency (3ω0).
- Broadband ultrashort pulses undergoing frequency tripling in nonlinear media often produce spectral peaks shifted from 3ω0.
Purpose of the Study:
- To investigate the nonlinear spectral transformations during third-harmonic generation of broadband ultrashort pulses.
- To demonstrate and analyze the spectral shifting phenomenon in extended nonlinear media, specifically photonic-crystal fibers.
Main Methods:
- Utilized femtosecond Cr:forsterite laser pulses as the broadband pump source.
- Employed multimode photonic-crystal fibers as the extended nonlinear medium for third-harmonic generation.
- Studied the spectral characteristics of the generated third-harmonic signal.
Main Results:
- Observed that THG of broadband pulses resulted in isolated spectral peaks substantially shifted from 3ω0.
- Demonstrated that adjacent guided modes at the third harmonic frequency were mapped onto a manifold of spectral peaks.
- Showcased spectral shifts and peak widths controlled by phase/group-velocity mismatch, interaction length, and pump spectral broadening.
Conclusions:
- Third-harmonic generation in multimode photonic-crystal fibers with broadband ultrashort pulses leads to significant spectral shifts.
- The spectral content of the third-harmonic signal can be engineered by controlling fiber dispersion and other experimental parameters.
