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 lm-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.

Hollow core waveguide as mid-infrared laser modal beam filter / Patimisco, P.; Sampaolo, A.; Giglio, M.; Kriesel, J. M.; Tittel, F. K.; Spagnolo, Vincenzo Luigi. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 1089-7550. - 118:11(2015). [10.1063/1.4930893]

Hollow core waveguide as mid-infrared laser modal beam filter

Patimisco, P.;Giglio, M.;SPAGNOLO, Vincenzo Luigi
2015-01-01

Abstract

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 lm-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.
2015
Hollow core waveguide as mid-infrared laser modal beam filter / Patimisco, P.; Sampaolo, A.; Giglio, M.; Kriesel, J. M.; Tittel, F. K.; Spagnolo, Vincenzo Luigi. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 1089-7550. - 118:11(2015). [10.1063/1.4930893]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/5507
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