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We present a theoretical investigation of optical self-focusing effects inlight scattering with condensates. Using long (>200 \mu s), red-detuned pulseswe show numerically that a non-negligible self-focusing effect is present thatcauses rapid optical beam width reduction as the scattered field propagatesthrough a medium with an inhomogeneous density distribution. The rapid growthof the scattered field intensity and significant local density feedbackpositively to further enhance the wave generation process and condensatecompression, leading to highly efficient collective atomic recoil motion.

Strong optical self-focusing effect in coherent light scattering with condensates