Optical third harmonic generation during femtosecond pulse diffraction in a Bragg grating

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/155907

Title: Optical third harmonic generation during femtosecond pulse diffraction in a Bragg grating
Author(s): Juodkazis, Saulius; Gaizauskas, Eugenijus; Jarutis, Vygandas; Reif, Jurgen; Matsuo, Shigeki; Misawa, Hiroaki
Abstract: We report on a novel phenomenon occurring when ultrashort laser pulses are diffracted in a Bragg grating recorded in a photo-thermo-refractive glass: two intense beams at the third harmonic of the incident laser frequency appear between the direct and the diffracted laser beams. A high conversion efficiency of about 0.04% at an incident intensity of 5 × 1011 W cm−2 in a 1 mm thick grating is attributed to self-phase matching for the third harmonic generation via Cherenkov radiation from the interfering third order polarization of the incident and diffracted beams. It is assumed that this is a general phenomenon for diffraction in a volume grating.
Publication type: Journal article
Source: Journal of Physics D: Applied Physics, Vol. 39, no. 1 (Jan 2006), pp. 50-53
Publication year: 2006
FOR Code(s): 02 Physical Sciences; 09 Engineering
Keyword(s): Femtosecond pulse diffraction; Fiber Bragg gratings; Glass; Harmonic generation; Intense beams; Laser beams; Laser optics; Light polarization; Natural frequencies; Refractive index; Volume grating
Publisher: Institute of Physics Publishing
ISSN: 0022-3727
Publisher URL: http://dx.doi.org/10.1088/0022-3727/39/1/009
Peer reviewed