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Intensity cross correlation in stimulated Raman scattering

Michael G. Raymer, Lynn A. Westling

Published Jun 9, 1986• 0 citations
OpenAlex

Abstract

We have observed the intensity cross correlation that occurs when broadband laser light is frequency shifted by stimulated Raman scattering.

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The cross-correlation function between the pump and Stokes intensities in stimulated Raman scattering has been measured. It has previously been conjectured 1 and theoretically shown2 that the Stokes light generated in the presence of a multimode or broadband pump is generated with mode amplitudes and phases in perfect correlation with those of the pump. We present here experimental evidence of such cross correlations for scattering in hydrogen gas. The measurement technique used is the same as that previously used for measuring the intensity autocorrelation function of a multimode dye laser.3 This technique is based on detecting the frequency doubled light from a nonlinear crystal as a function of time delay between the pump and Stokes beams. We have performed cross-correlation measurements using as a pump the light from a multimode dye laser which is operated in two different cavity configurations: one in which the mode spacing Δυ is large compared with the spontaneous linewidth of the Raman transition Γ, Δυ > Γ; and one in which the mode spacing is small, Δυ < Γ.

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Marek Trippenbach, Cao Long Van

The cross-correlation functions of a Stokes wave and the laser field of an arbitrary bandwidth in the process of stimulated Raman scattering were studied. The laser light was described as a stationary Gaussian stochastic process. A normalized second-order intensity cross-correlation function has been obtained both in transient and in steady-state limits. It exhibits an asymmetry with respect to zero, which is due to the buildup of Raman gain. We propose the functional method to be used in calculating the higher-order correlations.

Journal of the Optical Society of America B•Jun 1, 1986•7 citations
The cross-correlation function between the pump and Stokes intensities in stimulated Raman scattering has been measured. It has previously been conjectured 1 and theoretically shown2 that the Stokes light generated in the presence of a multimode or broadband pump is generated with mode amplitudes and phases in perfect correlation with those of the pump. We present here experimental evidence of such cross correlations for scattering in hydrogen gas. The measurement technique used is the same as that previously used for measuring the intensity autocorrelation function of a multimode dye laser.3 This technique is based on detecting the frequency doubled light from a nonlinear crystal as a function of time delay between the pump and Stokes beams. We have performed cross-correlation measurements using as a pump the light from a multimode dye laser which is operated in two different cavity configurations: one in which the mode spacing Δυ is large compared with the spontaneous linewidth of the Raman transition Γ, Δυ > Γ; and one in which the mode spacing is small, Δυ < Γ.
When a high-intensity laser beam passes through a transparent and homogeneous optical medium, the induced light scattering may manifest the properties of stimulated radiation characterized by threshold requirement, high directionality, and high brightness. This is the stimulated scattering of intense coherent light. Discoveries and studies of various types of stimulated scattering effects have provided a much deeper and more comprehensive understanding of interactions between the intense coherent light and matter. On the other hand, devices based on stimulated Raman scattering, stimulated Brillouin scattering, and stimulated spin-flip Raman scattering can be employed as highly efficient tunable frequency shifters of coherent light. Stimulated Kerr scattering can be used to generate a super-broadband coherent light and to investigate the molecular anisotropy of liquids. In addition, the recently developed stimulated Rayleigh–Bragg scattering and stimulated Mie scattering can significantly reduce the threshold requirement, and provide a highly efficient no-frequency-shift optical phase conjugation wave.
The cross-correlation functions of a Stokes wave and the laser field of an arbitrary bandwidth in the process of stimulated Raman scattering were studied. The laser light was described as a stationary Gaussian stochastic process. A normalized second-order intensity cross-correlation function has been obtained both in transient and in steady-state limits. It exhibits an asymmetry with respect to zero, which is due to the buildup of Raman gain. We propose the functional method to be used in calculating the higher-order correlations.