Abstract

A spectral shift in the first Stokes generation band has been observed at stimulated Raman scattering in a Bessel light beam. Under nanosecond pulse excitation in barium nitrate crystal, the Stokes emission propagating along the Bessel beam axis has been found to be frequency shifted toward the blue side by $3.7\mathrm{GHz}$ with respect to the Stokes emission propagating along the surface of a cone. Numerical data have shown that the observed frequency shift is directly related to the contribution of the real part of the Raman susceptibility to the refractive index. This contribution causes an increase in the Stokes gain out of exact Raman resonance owing to induced focusing, which inhibits diffraction spread of generated light and thus provides its better spatial overlap with the pump beam.

© 2008 Optical Society of America

Tunable stimulated Raman scattering by pumping with Bessel beams

S. Klewitz, P. Leiderer, S. Herminghaus, and S. Sogomonian
Opt. Lett. 21(4) 248-250 (1996)

Efficient conical emission of stimulated Raman Stokes light generated by a Bessel pump beam

L. Niggl and Max Maier
Opt. Lett. 22(12) 910-912 (1997)

Generation and amplification of pulsed Bessel beams by seeding an optical parametric amplifier

M. Clerici, O. Jedrkiewicz, E. Rubino, D. Faccio, L. Tartara, V. Degiorgio, and P. Di Trapani
Opt. Lett. 33(20) 2296-2298 (2008)

Bessel beam spectral-domain high-resolution optical coherence tomography with micro-optic axicon providing extended focusing range

Kye-Sung Lee and Jannick P. Rolland
Opt. Lett. 33(15) 1696-1698 (2008)

Direct generation of bessel beams

Peter Muys and Eefje Vandamme
Appl. Opt. 41(30) 6375-6379 (2002)