THIRD HARMONIC GENERATION AT REFLECTION FROM CRYSTAL OF HIGH-INTENSITY FEMTOSECOND RADIATION

2010 , VOLUME 10, NUMBER 4 ( JULY-AUGUST )

ISSN 2226-1494 (print), ISSN 2500-0373 (online)

Publications

Editor-in-Chief

Nikiforov
Vladimir O.
D.Sc., Prof.

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Abstract

Experimental results of the reflection of femtosecond radiation with a power density of 4 TWt/cm² and duration

of ~ 40 fs from nonlinear crystal of LiF at light falling to medium boundary close to normal were presented. The

generation of triple frequency radiation was observed at the reflection from the front face of the crystal. Spatial

distributions of triple frequency beam and fundamental beam were recorded. Energy of triple frequency radiation

was 10^-4 of the energy of the incident radiation. Half-width of light beam spatial distribution on the triple

frequency radiation happens to be three times narrower than fundamental beam half-width.

Keywords: extremely short light pulses, reflection of extremely short light pulses, nonlinear crystal LiF, generation of the third harmonic