Journal
OPTICA
Volume 2, Issue 1, Pages 14-17Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.2.000014
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Funding
- Air Force Office of Scientific Research (AFOSR) [FA9550-14-1-0165]
- Defense Advanced Research Projects Agency (DARPA) [W911NF-12-1-0323, W911NF-13-1-0103]
- Office of Naval Research (ONR) [N00014-11-1-0098, N00014-11-1-0133]
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Nonlinear frequency mixing as a means to coherently convert light to new frequencies is widely used in many branches of optics. This process requires momentum conservation through phase matching (PM). In free-space optics, PM is achieved through angle tuning the medium with respect to the incoming light-here we explore an in-fiber analogue: PM using spatial modes of the fiber. We demonstrate over two octaves (400-1700 nm) of coherent spectral translation generated by intermodal four-wave mixing between subsets of 11 different Bessel-like fiber modes. These interactions are facilitated by the unique mode-coupling resistance of this subset of azimuthally symmetric, zero orbital angular momentum fiber modes. Their stability allows overcoming previous limitations of multimode nonlinear-optical systems imposed by mode coupling, hence enabling long interaction lengths, large effective mode areas, and a highly multimode basis set with which a new degree of freedom for versatile PM can be obtained. (C) 2015 Optical Society of America
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