Strong thermal self-focusing of an argon laser beam has been observed when the beam passes through lead glass. Focal lengths of less than 20 cm were obtained. The beams showed the effects of spherical aberration and at certain power levels beam trapping occurred. A simple theory is proposed to explain the observed trapping. Computer solutions have been obtained which reasonably agree with experimental determination of focal planes and spot radius.
Self-phase modulation of laser beams by media which possess a temperature-dependent refractive index gives rise to far-field aberrational rings. Steady-state aberration profiles were measured and quantitative agreement with theory was obtained. A simple qualitative explanation of the ring structure is given. A self-induced frequency modulation of 1.5-W argon laser pulses was also observed and chirping detected.
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