Strong slow-light resonances in apodized deuterium-loaded femtosecond FBGs

George Skolianos; Arushi Arora; Martin Bernier; Michel J. F. Digonnet

doi:10.1117/12.2081508

10 March 2015 Strong slow-light resonances in apodized deuterium-loaded femtosecond FBGs

George Skolianos, Arushi Arora, Martin Bernier, Michel J. F. Digonnet

Proceedings Volume 9378, Slow Light, Fast Light, and Opto-Atomic Precision Metrology VIII; 93780E (2015) https://doi.org/10.1117/12.2081508
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

This paper reports the generation of record low group velocities, large group delays, and high optical confinements in strong apodized fiber Bragg gratings (FBGs). The gratings were fabricated in deuterium-loaded fiber using an 806-nm femtosecond laser and a phase mask to produce strong apodized index-modulation profiles and low internal loss, followed by annealing to reduce residual losses. In a first FBG of this type with a length of ~25 mm and a non-saturated index modulation we measured a group delay–transmission product of 10.4 ns, the highest ever reported. In a stronger, shorter FBG (12.3 mm in length), a group delay of 42 ns was observed, corresponding to a group velocity of only ~290 km/s and a group index of 1020. In a still shorter and therefore lower loss device (~5 mm) we were able to observe the fundamental mode, and infer a Purcell factor as high as 25.5. These exceptional features are made possible in part by the gratings’ strong index modulation (~2x10^-3) and ultra-low single-pass loss (~0.01–0.015 dB/cm).

Citation Download Citation

George Skolianos, Arushi Arora, Martin Bernier, and Michel J. F. Digonnet "Strong slow-light resonances in apodized deuterium-loaded femtosecond FBGs", Proc. SPIE 9378, Slow Light, Fast Light, and Opto-Atomic Precision Metrology VIII, 93780E (10 March 2015); https://doi.org/10.1117/12.2081508

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