Small-stokes-shift frequency conversion in single-mode birefringent fibers

We report experimental observation of nondegenerate four-photon mixing (FPM) via a new phase-matched process in birefringent fibers. This phase-matching process is characterized by relatively long coherence lengths, and by small pump-to-Stokes frequency shifts (of the order of 100 cm -1 in high bire...

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Bibliographic Details
Published in:Optics communications 1984-08, Vol.51 (2), p.121-126
Main Authors: Stenersen, K., Jain, R.K.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nonlinear optics
Optics
Physics
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Summary:We report experimental observation of nondegenerate four-photon mixing (FPM) via a new phase-matched process in birefringent fibers. This phase-matching process is characterized by relatively long coherence lengths, and by small pump-to-Stokes frequency shifts (of the order of 100 cm -1 in high birefringence fibers) that are directly proportional to the fiber birefringence. Pump-to-Stokes energy conversion efficiencies of over 40 percent have been obtained with moderate pump powers (≈1 kW) from a visible cw mode-locked dye laser coupled into single-mode polarization-preserving high-birefringence fibers of a few meters length. In addition, we report the first observation of a totally non-degenerate phase-matched four-photon process in a fiber; this invokes mixing of the original FPM Stokes component with the pump and stimulated Raman radiation.
ISSN:0030-4018
1873-0310
DOI:10.1016/0030-4018(84)90164-0