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Optimization and characterization of the doped optical fibers for radiation balanced fiber laser and amplifier

Wednesday January 20, 2021
10:15 am

 Presenter:  Mostafa Peysokhan
 Series:  Thesis and Dissertation Defenses
 Abstract:  Due to the reliability, compactness, low maintenance costs, superior performance, and
versatility of fiber lasers and amplifiers, they are commonly employed in scientific and directed energy
applications. Among all kinds of fiber lasers and amplifiers, high-power, Yb-dopped fiber lasers, and
amplifiers have been extensively researched to achieve higher output powers. One of the major
hindrances to achieving higher powers with adequate stability and efficiency in high power performance is
heat generated in the fiber lasers and amplifiers' core.

The Radiation Balanced Laser (RBL) is a viable technique for heat mitigation has been proposed by S.
Bowman in 1995. RBL technique is based on solid-state laser cooling as a self-cooling mechanism to
mitigate the generated heat in lasers and amplifiers. Here in this study, we will investigate three critical
issues for building a radiation-balanced fiber laser or amplifier: (i) the accountability of ZBLAN glass as a
platform for executing the idea of RBL, (ii) the possibility of laser cooling of silica, which is a necessary
condition for RBL, and (iii) investigation of an analytical solution for radiation balanced fiber laser.
A necessary condition for a radiation-balanced laser or amplifier is that the gain medium should be
amenable to laser cooling. We introduce a new technique for extracting laser cooling related parameters
of doped optical fibers. Furthermore, we implement our technique to characterize Yb-doped ZBLAN fiber,
and also we investigate the feasibility of radiation balancing in Yb-doped ZBLAN fibers. We also
characterized Yb-doped silica, which is the most common fiber leaser material. In this study, we
accomplished, to the best of our knowledge, the lowest achieved laser-cooled temperature in silica glass,
which is more than 6 K temperature drop. In this research, we introduce an analytical solution for a
radiation balanced fiber laser.
 Host:  Arash Mafi
 File/Video Recording:  http://physics.unm.edu/pandaweb/events/flyers/peysokhan_210120.pdf
 Location:  Zoom

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