Random lasing in an Anderson localizing optical fiber.

Random lasing in an Anderson localizing optical fiber.
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DOI:
10.1038/lsa.2017.41
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发表时间:
2017-08
期刊:
Light, science & applications
影响因子:
--
通讯作者:
Mafi A
Mafi A
中科院分区:
其他
文献类型:
--
作者:
Abaie B;Mobini E;Karbasi S;Hawkins T;Ballato J;Mafi A

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报道了一种在无序玻璃光纤中由横向安德森局域化介导的定向随机激光。由于随机激光器的多方向性和激光发射的混沌波动,以往的演示发现其应用有限。本文提出的随机激光器工作在安德森定位区。无序诱导的局域态形成孤立的局部通道,使输出激光束具有高度的方向性和稳定的光谱。强的横向无序性和纵向不变性导致了与周围环境相互作用可以忽略不计的孤立激光模式,在由空气-光纤界面形成的法布里-珀罗腔中来回传播。结果表明,在无序光纤输入面扫描局部输入泵浦时,输出的激光信号跟随泵浦的横向位置。此外,在无序光纤的输入面上均匀分布的泵浦产生具有非常低空间相干性的激光信号,这在许多光学平台中具有实际意义,包括光纤束的图像传输。
A directional random laser mediated by transverse Anderson localization in a disordered glass optical fiber is reported. Previous demonstrations of random lasers have found limited applications because of their multi-directionality and chaotic fluctuations in the laser emission. The random laser presented in this paper operates in the Anderson localization regime. The disorder induced localized states form isolated local channels that make the output laser beam highly directional and stabilize its spectrum. The strong transverse disorder and longitudinal invariance result in isolated lasing modes with negligible interaction with their surroundings, traveling back and forth in a Fabry–Perot cavity formed by the air–fiber interfaces. It is shown that if a localized input pump is scanned across the disordered fiber input facet, the output laser signal follows the transverse position of the pump. Moreover, a uniformly distributed pump across the input facet of the disordered fiber generates a laser signal with very low spatial coherence that can be of practical importance in many optical platforms including image transport with fiber bundles.
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