Diffraction of pulsed laser radiation from an acoustic wave with frequency- and phase-shift keying |
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Authors: | S N Antonov A V Vainer V V Proklov and Yu G Rezvov |
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Institution: | 1.Kotel’nikov Institute of Radio Engineering and Electronics,Russian Academy of Sciences,Fryazino, Moscow oblast,Russia;2.Novomoskovsk Institute at the Mendeleev Russian University of Chemical Technology,Novomoskovsk,Russia |
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Abstract: | Bragg acoustooptic diffraction of nanosecond pulsed laser radiation from a frequency- and/or phase-keyed acoustic wave is
studied experimentally and theoretically for exact synchronization of laser pulses and signal keying. It is shown that the
diffraction field for short pulses is practically stationary and is determined by the positions of acoustic signal keying
over signal aperture. The application of this type of signals for the formation of a multibeam diffraction pulsed radiation
field is considered. A method is proposed for transforming the angular spectrum of laser radiation intensity from the initial
Gaussian to a nearly rectangular spectrum. This may considerably increase the efficiency of high-power technological lasers
used in material processing (laser cutting, welding, engraving, etc.), in which the action of radiation is of the thresh-old
type in light intensity. The possibility of correcting the angular intensity distribution for a pulsed fiber laser, which
increases the thermal efficiency of radiation from such a laser, is established experimentally. |
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