Abstract
Bessel beams are diffraction-free solutions of the wave equation, which can be produced experimentally with circular phase grating.1 We investigated stimulated scattering processes with Bessel pump beams, which had a radial field distribution proportional to the Bessel function /0(ar), a determines the diameter d0 ≈ 4.81/α of the central lobe of the beam and the cone angle γP = αλP/2π ≈ 0.77λP/d0 of the plane waves constituting the Bessel beam. Measurements of stimulated Raman scattering have shown that, for small cone angles γP of the Bessel beam on the order of a few mrad, the first Stokes light is emitted mainly along the surface of a cone,2 while for large values of γP on the order of a few hundred mrad, a nearly diffraction-limited Stokes beam was observed along the cone axis.3
© 1998 Optical Society of America
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