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Thulium-doped fiber performance optimization via fiber bending and twisting and inner-cladding shape design

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985882%3A_____%2F21%3A00555636" target="_blank" >RIV/67985882:_____/21:00555636 - isvavai.cz</a>

  • Result on the web

    <a href="https://doi.org/10.1117/12.2592309" target="_blank" >https://doi.org/10.1117/12.2592309</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1117/12.2592309" target="_blank" >10.1117/12.2592309</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Thulium-doped fiber performance optimization via fiber bending and twisting and inner-cladding shape design

  • Original language description

    Thulium-doped fiber lasers have been extensively investigated as the most promising source of efficient laser emission at wavelengths around 2 μm, i. e., in the eye-safer spectral region and in the atmospheric window as well. It allows for wide range of applications including medicine, defense, distance measurement or materials processing. To enhance pump absorption efficiency along the active double-clad fiber, good overlap of the pump light and doped fiber core should be achieved along the fiber length. The overlap can be increased by breaking the circular symmetry of the inner cladding by shaping its cross-section. Further mode-mixing and better pump absorption can be achieved by coiling and twisting of double-clad fibers. In this work we present experimental measurement of 792 nm pump cladding absorption of a series of double-clad thulium-doped fibers with respect to their bend radius, the inner cladding cross-sectional shape and twist rate. With these fibers, we assembled a set of fiber lasers with different resonator setups and tested their performance. Twisting was introduced to fiber during drawing from an octagonal, CO2 laser-shaped or mechanically grinded preform so that the twist remained frozen in the drawn fiber. We have shown that the fiber twist significantly improves the pump absorption even in the case of straight or coiled fibers with large coil radii. We provide a preliminary comparison of two fiber laser resonators

  • Czech name

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

  • OECD FORD branch

    10306 - Optics (including laser optics and quantum optics)

Result continuities

  • Project

    <a href="/en/project/GA19-03141S" target="_blank" >GA19-03141S: Research of novel geometries and layouts of double-clad rare-earth-doped fibers for high power fiber lasers</a><br>

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2021

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Article name in the collection

    Proceedings of SPIE

  • ISBN

    978-1-5106-4381-9

  • ISSN

    0277-786X

  • e-ISSN

    1996-756X

  • Number of pages

    6

  • Pages from-to

    117731A

  • Publisher name

    SPIE

  • Place of publication

    BELLINGHAM

  • Event location

    Virtual, Online

  • Event date

    Apr 19, 2021

  • Type of event by nationality

    WRD - Celosvětová akce

  • UT code for WoS article

    000696183900029