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首页> 外文会议>Slow light, fast light, and opto-atomic precision metrology VIII >Strong Slow-Light Resonances in Apodized Deuterium-Loaded Femtosecond Fiber Bragg Gratings
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Strong Slow-Light Resonances in Apodized Deuterium-Loaded Femtosecond Fiber Bragg Gratings

机译：载有氘的飞秒飞秒光纤布拉格光栅中的强慢共振。

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摘要

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 (～2×10~(-3)) and ultra-low single-pass loss (～0.01-0.015 dB/cm).
机译：本文报道了在强切趾光纤布拉格光栅（FBG）中创纪录的低群速度，大群延迟和高光学限制的产生。使用806 nm飞秒激光和相位掩模在负载氘的光纤中制造光栅，以产生强切趾指数调制曲线和低内部损耗，然后进行退火以减少残留损耗。在这种类型的第一个FBG中，它的长度约为25 mm，并且具有非饱和折射率调制，我们测得的群延迟传输乘积为10.4 ns，是有史以来最高的。在更强，更短的FBG（长度为12.3 mm）中，观察到42 ns的群时延，相当于群速度仅为〜290 km / s，群指数为1020。在更短且因此损耗更低的设备中（〜5 mm），我们能够观察到基本模式，并推断出赛尔系数高达25.5。光栅的强折射率调制（〜2×10〜（-3））和超低单通损耗（〜0.01-0.015 dB / cm）使得这些特殊功能成为可能。

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