Résumé:
Single bubble sonoluminescence is characterized by a great concentration of energy during the collapse of a gas bubble, which leads to the generation of photons from a low frequency ultrasound. The narrow stability domain of sonoluminescence has limited previous attempts to reinforce this inertial confinement in order to generate photons of higher energy or ignite nuclear fusion reaction. We present a new experimental approach where an ultrasonic pulse of high frequency is adaptively focused on the bubble during the collapse. Using an array of 8 transmitters, a pressure pulse of 0.7 MPa doubles the flash intensity and this technique can easily be extended to higher pressure.

Mots-clés: Sonoluminescence, boosting, pulse, ultrasound, adaptive focusing