Reflectivity of Superimposed Bragg Gratings Induced by Longitudinal Mode Instabilities in Fiber Lasers

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985882%3A_____%2F18%3A00499863" target="_blank" >RIV/67985882:_____/18:00499863 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1109/JSTQE.2018.2806084" target="_blank" >http://dx.doi.org/10.1109/JSTQE.2018.2806084</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1109/JSTQE.2018.2806084" target="_blank" >10.1109/JSTQE.2018.2806084</a>

Result language
angličtina
Original language name
Reflectivity of Superimposed Bragg Gratings Induced by Longitudinal Mode Instabilities in Fiber Lasers
Original language description
We report on reflectivity of transient Bragg gratings created in the active medium of a fiber laser with longitudinalmode instability. Despite the long history of laser physics, reflectivities of such gratings were theoretically studied and experimentally measured only recently. Based on the coupled-mode theory, we derived a theoretical model of superimposed Bragg gratings for a special case of mode instability known as spontaneous laser line sweeping (SLLS). SLLS fiber lasers exhibit a periodic wavelength drift over an interval of several nanometers, followed by a quick bounce backward, narrowband, and mostly single-frequency operation as well as pulsed output with pulse lengths on the order of microseconds. The refractive index modulation inside the active fiber is given by the Kramers-Kronig relations. For ytterbium, the refractive index change in the 1060-nm band is directly proportional to the metastable level population with a factor of 2.1 x 10-31 m(3). Taking into account realistic values of temporal damping of the gratings, significant reflectivity on the order of units to tens of percent is estimated. The reflectivity can be controlled by setting the SLLS laser parameters. Effect of the resonator length is shown as an example
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
<a href="/en/project/GA16-13306S" target="_blank" >GA16-13306S: Self-sweeping of laser wavelength and associated instabilities of fiber lasers</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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