CHARACTERISTICS OF PARAMETRIC FREQUENCY-CONVERSION MAKING USE OF BESSEL LIGHT-BEAMS

It is proposed that Bessel light beams be used to pump optical paramet ric oscillators. The advantages of such pumping are demonstrated by a comparison with Gaussian light beams. In particular, the maximum mode coupling coefficient is achieved in a parametric oscillator pumped by a Bessel beam, which enhances parametric amplification. A nonlinear co nversion regime that does not destroy the spatial structure of the int racavity fields is found. This opens up the possibility of increasing the efficiency of conversion of the energy of an input Bessel beam, co mpared with a Gaussian beam.