Thermooptical Sound Generation by Bessel Light Beams in Nonlinear Crystals

Abstract

The peculiarities of thermooptical excitation of elastic waves in nonlinear crystals, which appear due to modulated absorption of the energy from a Bessel light beam at the second harmonic, were theoretically examined. The amplitude-phase characteristics of the photoacoustic signal were found, and the conditions of the most effective thermooptical excitation of the sound were determined. The received results can be used in the design of new optoacoustic scanners for diagnostics of subsurface structures and new quantum electronics and integrated optics devices.

Photoacoustic transformation of Bessel light beams in magnetoactive superlattices

“…One efficient method is based on the laser excitation of sound in the media under study [10,11]. As was shown in [12][13][14][15], the use of different polarization modes of Bessel light beams (BLBs) as sound-exciting radiation [16] is promising for this method, because these beams have a number of unique properties (for example, they are not diffracted when they propagate in space [17][18][19]). An important specific feature of BLBs is the occurrence of a radial energy flux, which compensates for the change in the light-beam transversality when screened the beam central region [20].…”