A4 Article in conference proceedings
Ytterbium-doped fibers for high-power fiber lasers (2021)


Dutta, A. (2021). Ytterbium-doped fibers for high-power fiber lasers. In M.M. Sinha, & S.S. Verma (Eds.), AMRP-2020 : 5th National e-Conference on Advanced Materials and Radiation Physics (Article 020071). American Institute of Physics. AIP Conference Proceedings, 2352. https://doi.org/10.1063/5.0052378


JYU authors or editors


Publication details

All authors or editorsDutta, Arpan

Parent publicationAMRP-2020 : 5th National e-Conference on Advanced Materials and Radiation Physics

Parent publication editorsSinha, M. M.; Verma, S. S.

Conference:

  • National e-Conference on Advanced Materials and Radiation Physics

Place and date of conferenceLongowal, India9.-11.11.2020

eISBN978-0-7354-4105-7

Journal or seriesAIP Conference Proceedings

ISSN0094-243X

eISSN1935-0465

Publication year2021

Number in series2352

Article number020071

PublisherAmerican Institute of Physics

Publication countryUnited States

Publication languageEnglish

DOIhttps://doi.org/10.1063/5.0052378

Publication open accessNot open

Publication channel open access

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/78421


Abstract

Ytterbium (Yb) doped optical fibers are widely used in high-power applications and ultrafast lasing since they show adequate power-handling capability and provide desirable beam quality. Yb-doped fibers with large core area can support high power but often act as a multimode fiber and compromise the output beam quality. Hence, it is important to attain a proper balance between the power-handling capability and the beam quality. Yb-doped fibers as a gain medium in pulsed fiber laser systems are prone to nonlinear optical effects due to the presence of high peak power in the ultrashort pulses. Nonlinearity such as self phase modulation (SPM) affects the width and the shape of the pulse, both temporally and spectrally, by inducing chirp during its propagation along the fiber. In this work, finite element method was employed to compute linearly polarized transverse modes and the corresponding modal powers of Yb-fibers with different core areas to optimize the trade-off between the power-handling capability and the beam quality. The optimal fiber was implemented as a gain medium in a passively mode-locked fiber laser system to generate an ultrashort picosecond pulse. The spectral width of the picosecond pulse was studied as a function of pump power to spot the presence of SPM and chirp. To grow a better understanding on the chirped pulse propagation in the fiber, nonlinear Schrödinger equation was numerically simulated in the anomalous dispersion regime under the influence of initial chirp. The simulations reveal a strategy to compress a pulse temporally and utilize it in all-fiber chirped pulse amplification to mitigate nonlinearity in high power applications.


Keywordsfibre opticsoptical fibresdoping (semiconductor technology)laserslaser technology


Contributing organizations


Ministry reportingYes

Reporting Year2021

JUFO rating1


Last updated on 2024-22-04 at 19:00