Hollow core waveguide as mid-infrared laser modal beam filter

A novel method for mid-IR laser beam mode cleaning employing hollow core waveguide as a modal filter element is reported. The influence of the input laser beam quality on fiber optical losses and output beam profile using a hollow core waveguide with 200 μm-bore size was investigated. Our results de...

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Bibliographic Details
Published in:Journal of applied physics 2015-09, Vol.118 (11)
Main Authors: Patimisco, P., Sampaolo, A., Giglio, M., Kriesel, J. M., Tittel, F. K., Spagnolo, V.
Format: Article
Language:English
Subjects:
Applied physics
BEAMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Core loss
Fiber lasers
Fiber optics
FIBERS
FILTERS
Filtration
Infrared filters
Infrared lasers
Laser beams
Laser modes
LASERS
LENGTH
LOSSES
Optical fibers
Radius of curvature
TRANSMISSION
WAVEGUIDES
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Summary:A novel method for mid-IR laser beam mode cleaning employing hollow core waveguide as a modal filter element is reported. The influence of the input laser beam quality on fiber optical losses and output beam profile using a hollow core waveguide with 200 μm-bore size was investigated. Our results demonstrate that even when using a laser with a poor spatial profile, there will exist a minimum fiber length that allows transmission of only the Gaussian-like fundamental waveguide mode from the fiber, filtering out all the higher order modes. This essentially single mode output is preserved also when the waveguide is bent to a radius of curvature of 7.5 cm, which demonstrates that laser mode filtering can be realized even if a curved light path is required.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4930893