21 February 2011 Fiber-optic Cherenkov radiation excited by few-cycle pulses
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Fiber-optic Cherenkov radiation has emerged as a wavelength conversion technique to achieve isolated spectrum in the visible wavelength range. Most published results have reinforced the impression that CR forms a narrowband spectrum with poor efficiency. We both theoretically and experimentally investigate fiber-optic Cherenkov radiation excited by few-cycle pulses. We introduce the coherence length to quantify the Cherenkov-radiation bandwidth and its dependence on propagation distance. Detailed numerical simulations verified by experimental results reveal three unique features that are absent when pumped with often-used, long pulses; that is, continuum generation (may span one octave in connection with the pump spectrum), high conversion efficiency (up to 40%), and broad bandwidth (70 nm experimentally obtained) for the isolated Cherenkov radiation spectrum. These merits allow achieving broadband visible-wavelength spectra from low-energy ultrafast sources which opens up new applications.
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Guoqing Chang, Guoqing Chang, Li-Jin Chen, Li-Jin Chen, Franz X. Kärtner, Franz X. Kärtner, } "Fiber-optic Cherenkov radiation excited by few-cycle pulses", Proc. SPIE 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV, 79371M (21 February 2011); doi: 10.1117/12.877068; https://doi.org/10.1117/12.877068

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