Stimulated Doppler effect on the surface of a gas bubble thermocapillary trapped by a laser in an absorbing liquid

摘要

A possibility to control the gas bubble size in an absorbing liquid through the laser thermo-capillary trapping has been demonstrated. The coarse structure of the observed interference patterns in reflected and transmitted lights are explained qualitatively within the framework of a two-ray approach. The movement of interference fringes can be treated as a manifestation of the Doppler effect because of the moving bubble walls. A method to measure a relative refractive index value for moving contiguous media by means of the Doppler shifts ratio measurement has been proposed. There is a two times discrepancy between Doppler shifts ratio value predicted theoretically and measured in the experiment. It is following from a special stimulated character of the Doppler effect at experimentally realized non-equilibrium thermodynamic conditions, that are imposed by the laser light field.