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Influence of no-core fiber on the focusing performance of an ultra-small gradient-index fiber probe
Shanghai Univ, Peoples R China; Sci and Technol Near Surface Detect Lab, Peoples R China.
Shanghai Univ, Peoples R China; Sci and Technol Near Surface Detect Lab, Peoples R China.
Sci and Technol Near Surface Detect Lab, Peoples R China.
Sci and Technol Near Surface Detect Lab, Peoples R China.
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2018 (English)In: Optics and lasers in engineering, ISSN 0143-8166, E-ISSN 1873-0302, Vol. 107, p. 46-53Article in journal (Refereed) Published
Abstract [en]

The light-beam expansion effect of a no-core fiber on the focusing performance of an ultra-small gradient-index fiber probe is investigated with a view to optimizing the optical performance of such probes. By taking the variable relationship between the focusing performance (including the working distance and the focusing spot size) of the probe and the length of the no-core fiber as the criterion, the effective beam expansion length of the no-core fiber in the ultra-small gradient-index fiber probe is calculated based on the basic properties of the Gaussian beam. Verification and analysis are done by numerical calculations and experimental measurements, respectively. The obtained results show that the working distance of an ultra-small gradient-index fiber probe can be increased effectively by adding a no-core fiber; however, this will lead to increasing the focusing spot size. For the parameters of the fiber probe studied here, the effective beam expansion length of the no-core fiber spacer is less than 0.357 mm. (C) 2018 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2018. Vol. 107, p. 46-53
Keywords [en]
Optical probe; Ultra-small gradient-index probe design; No-core fiber; Beam expansion effect
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-149839DOI: 10.1016/j.optlaseng.2018.03.008ISI: 000437360800006OAI: oai:DiVA.org:liu-149839DiVA, id: diva2:1236458
Note

Funding Agencies|National Natural Science Foundation of China [61773249]; Natural Science Foundation of Shanghai [16ZR1411700]; Science and Technology on Near-Surface Detection Laboratory [6142414090117, TCGZ2017A006]

Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-02

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Valyukh, Sergiy
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Thin Film PhysicsFaculty of Science & Engineering
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