Observation of speckle pattern and interference fringe forks in stimulated Raman scattering beam profile

Raphael Kh. Drampyan

doi:10.1117/12.428273

30 May 2001 Observation of speckle pattern and interference fringe forks in stimulated Raman scattering beam profile

Raphael Kh. Drampyan

Author Affiliations +

Proceedings Volume 4403, Second International Conference on Singular Optics (Optical Vortices): Fundamentals and Applications; (2001) https://doi.org/10.1117/12.428273
Event: Singular Optics 2000: Fundamentals and Applications of Optical Vortices, 2000, Crimea, Ukraine

Abstract

The circularly distributed speckle pattern, as well as interference fringe structure in profile of the beam of stimulated Raman scattering (SRS) I Stokes component, pumped by multimode radiation with nearly four-fold azimuthal symmetry, have been observed. The SRS was excited near the threshold of generation by nanosecond pulses of laser radiation at wavelength 530 nm. The profile of output pump beam had a uniform intensity distribution, whereas the SRS beam profile showed kaleidoscopic change from shot to shot, while the energies of input pulses were kept stable. The interference fringes showed a number of points where the fringes originated or vanished. Such behavior, which is the vortex signature, allows to suppose that SRS waves, generated from quantum noise, carry screw dislocations.

Citation Download Citation

Raphael Kh. Drampyan "Observation of speckle pattern and interference fringe forks in stimulated Raman scattering beam profile", Proc. SPIE 4403, Second International Conference on Singular Optics (Optical Vortices): Fundamentals and Applications, (30 May 2001); https://doi.org/10.1117/12.428273

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