Efficiency of nonstationary transformation of the spatial coherence of pulsed laser radiation in a multimode optical fibre upon self-phase modulation

Journal Article · Fri Aug 31 04:00:00 EDT 2007 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2007V037N08ABEH013506· OSTI ID:21466714

Kitsak, M A ^[1]; Kitsak, A I ^[2]

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1. Department of Physics, Boston University, Boston (United States)
2. B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk (Belarus)

The model scheme of the nonlinear mechanism of transformation (decreasing) of the spatial coherence of a pulsed laser field in an extended multimode optical fibre upon nonstationary interaction with the fibre core is theoretically analysed. The case is considered when the spatial statistics of input radiation is caused by phase fluctuations. The analytic expression is obtained which relates the number of spatially coherent radiation modes with the spatially energy parameters on the initial radiation and fibre parameters. The efficiency of decorrelation of radiation upon excitation of the thermal and electrostriction nonlinearities in the fibre is estimated. Experimental studies are performed which revealed the basic properties of the transformation of the spatial coherence of a laser beam in a multimode fibre. The experimental results are compared with the predictions of the model of radiation transfer proposed in the paper. It is found that the spatial decorrelation of a light beam in a silica multimode fibre is mainly restricted by stimulated Raman scattering. (fiber and integrated optics)

• OSTI ID: 21466714
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 8 Vol. 37; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAMS
COHERENT RADIATION
EFFICIENCY
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EXCITATION
FIBERS
FLUCTUATIONS
FREQUENCY MODULATION
LASER RADIATION
LASERS
MATHEMATICS
MINERALS
MODULATION
NONLINEAR PROBLEMS
OPTICAL FIBERS
OXIDE MINERALS
PHOTON BEAMS
RADIATIONS
RAMAN EFFECT
SILICA
STATISTICS
VARIATIONS
VISIBLE RADIATION