Fiber-optic Cherenkov radiation excited by few-cycle pulses

Guoqing Chang; Li-Jin Chen; Franz X. Kärtner

doi:10.1117/12.877068

21 February 2011 Fiber-optic Cherenkov radiation excited by few-cycle pulses

Guoqing Chang, Li-Jin Chen, Franz X. Kärtner

Proceedings Volume 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV; 79371M (2011) https://doi.org/10.1117/12.877068
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

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.

Citation Download Citation

Guoqing Chang, Li-Jin Chen, and 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); https://doi.org/10.1117/12.877068

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