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.
| Original language | English |
|---|---|
| Pages (from-to) | 50-53 |
| Number of pages | 4 |
| Journal | Journal of Physics D: Applied Physics |
| Volume | 39 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2006 Jan 7 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films
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Juodkazis, S., Gaižauskas, E., Jarutis, V., Reif, J., Matsuo, S., & Misawa, H. (2006). Optical third harmonic generation during femtosecond pulse diffraction in a Bragg grating. Journal of Physics D: Applied Physics, 39(1), 50-53. https://doi.org/10.1088/0022-3727/39/1/009