Four-photon-mixing-mediated stimulated Raman scattering in a multimode optical fiber.
Stimulated Raman scattering with 532-nm pulsed laser light is investigated in a 7.9-microm-core step-index multimode fiber. While low-intensity pump or single-mode LP(01) excitation produces the usual stimulated Raman scattering light, mixed-mode (LP(01) + LP(02)) excitation with pump intensities of ~5 kW uniformly shifts the multiorder Stokes Raman spectrum by an amount determined by fiber parameters, thus making stimulated Raman scattering tunable. This is due to the mediating influence of the four-photon mixing in the fiber.
Sharma
A
A
Dokhanian
M
M
Wu
Z
Z
Williams
A
A
Venkateswarlu
P
P