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23 results on '"Upadhyaya, B.N."'

13. Self-pulsing Dynamics in Yb-doped Fiber Lasers

Author

Upadhyaya, B.N.

Subjects
Technology & Engineering / Lasers & Photonics
Abstract

There is worldwide considerable interest in the study and development of high-power Yb-doped continuous wave (CW) and pulsed fiber lasers for various material processing applications. Although it appears to be trivial to generate high-power CW output from Yb-doped CW fiber lasers by pumping with high-power CW laser diodes; however, it is not so easy to generate truly CW output without amplitude modulations due to self-pulsing phenomenon. The observation of random self-pulses overriding CW output has been reported by several authors. These random self-pulses may have very high peak power to cause catastrophic damage of fiber laser components and thereby inhibit generation of high-power CW output. This chapter describes self-pulsing dynamics and its elimination in different Yb-doped CW fiber laser configurations.

Published
2016

22. Study of the fabrication parameters of large core Yb2O3 doped optical fibre through solution doping technique

Author

Paul, M.C., Upadhyaya, B.N., Das, S., Dhar, A., Pal, M., Kher, S., Dasgupta, K., Bhadra, S.K., and Sen, R.

Subjects
*MICROFABRICATION, *OXIDES, *OPTICAL fiber communication, *SEMICONDUCTOR doping, *POROUS materials, *SOLUTION (Chemistry), *MIXTURES, *STRENGTH of materials, *TEMPERATURE effect
Abstract

Abstract: Double clad large core Yb2O3 doped fibres with core diameter up to 20μm have been fabricated by the solution doping technique through deposition of multiple porous core layers. The process parameters have been optimized with respect to the uniform doping of Al2O3 and Yb2O3 within the large core preform through soaking of the deposited multiple porous layers of fixed SiO2–P2O5 composition with an alcoholic solution of a mixture of suitable strength of AlCl3·6H2O and YbCl3·6H2O to get the desired low NA around 0.09–0.11. The most critical parameters associated in this process are the deposition temperature with respect to uniform deposition of un-sintered layers of equal thickness with suitable porosity, viscosity of the soaking solution, pre-sintering temperature, proper mixing of the inlet gas mixture as well as proper drying of the thick porous layer after solution soaking process. This investigation will be very useful for development of large core Yb2O3 doped laser fibre technology. [Copyright &y& Elsevier]

Published
2010
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