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Optics Communications

Transmission of a dark hollow beam by hollow-core anti-resonant fiber

Xiaobin Xu, Zhao Di, Fuyu Gao, Yitong Song, Jixun Liu

Published Jan 20, 2020• 2 citations
Publisher
DOI
10.1016/j.optcom.2020.125239

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Summary form only given. One of the more promising proposals for guiding and focusing neutral atoms involves dark hollow laser beams. When detuned blue of resonance, the dipole force the atoms feel in the light confines them to the dark core of the beam where they can be transported with minimal interaction with the light. Dark hollow beams show promise for long distance transport of large numbers of ultra cold atoms, making them a strong competitor with hollow-core fiber atom guides. In this presentation we describe a simple way to construct an all-light atom tunnel with a series of axicons and a moderately powered diode laser beam.
We report all-optical mid-infrared phase and intensity modulators based on the photo-thermal effect in an acetylene-filled anti-resonant hollow-core fiber. Optical absorption of the control beam promotes the gas molecules to a higher energy level, which induces localized heating through non-radiative relaxation and modulates the refractive index of the gas material and hence the accumulated phase of the signal beam propagating through the hollow-core fiber. By modulating the intensity of the control beam, the phase of the signal beam is modulated accordingly. By use of a 1.53 μm near-infrared control beam, all-optical phase modulation up to 2.2π rad is experimentally demonstrated at the signal wavelength of 3.35 μm. With the phase modulator placed in one arm of a Mach-Zehnder interferometer, intensity modulation with on-off ratio of 25 dB is achieved. The gas-filled hollow-core-fiber modulators could operate over an ultra-broad wavelength band from near-to mid-infrared and have promising application in mid-infrared photonic systems.