Coherence of supercontinua generated by ultrashort pulses compressed in optical fibers |
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Authors: | Nicholson J W Yablon A D Yan M F Wisk P Bise R Trevor D J Alonzo J Stockert T Fleming J Monberg E Dimarcello F Fini J |
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Institution: | OFS Laboratories, 19 Schoolhouse Road, Somerset, NJ 08873, USA. jwn@ofsoptics.com |
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Abstract: | Femtosecond fiber lasers together with nonlinear fibers are compact, reliable, all-fiber supercontinuum sources. Maintaining an all-fiber configuration, however, necessitates pulse compression in an optical fiber, which can lead to nonlinearities for subhundred femtosecond, nanojoule pulses. In this work we show that using large-mode-area fibers for pulse compression mitigates the nonlinearity, resulting in compressed pulses with significantly reduced satellite pulses. Consequently, supercontinua generated with these pulses are shown to have as much as a 10 dB increase in coherence fringe contrast. By using a hybrid highly nonlinear fiber-photonic crystal fiber, the continuum can be extended to visible wavelengths while still maintaining high coherence. |
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