Abstract
It is shown that the size of the focal spot has a substantial influence on the dynamics of Mandel’shtam-Brillouin induced scattering (MBIS) for the laser beam power near critical for striction self-focusing. For small focal spots MBIS suppresses self-focusing. An increase in the size of the focal spot leads to growth of the MBIS pulsations and the steady-state setup time. For large enough focal spots MBIS arises in the form of regular intense spikes. Physical processes shaping the dynamics of MBIS are discussed.
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