Optimizing Yb concentration of fiber amplifiers in the presence of transverse modal instabilities and photodarkening | Zendy

Jesper Lægsgaard | Zendy

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Optimizing Yb concentration of fiber amplifiers in the presence of transverse modal instabilities and photodarkening

Author(s) -

Jesper Lægsgaard

Publication year - 2016

Publication title -

applied optics

Language(s) - English

Resource type - Journals

ISSN - 0003-6935

DOI - 10.1364/ao.55.001966

Subject(s) - photodarkening , optics , materials science , cladding (metalworking) , transverse plane , amplifier , fiber amplifier , optical fiber , modal , attenuation coefficient , absorption (acoustics) , fiber laser , optoelectronics , physics , composite material , structural engineering , cmos , engineering

The Yb concentration of double-clad optical fiber amplifiers is numerically optimized with respect to maximizing the transverse modal instability threshold in the presence of absorption arising from photodarkening. The pump cladding area is scaled with the Yb concentration to approximately maintain the pump absorption in operation. It is found that approximate analytical expressions can predict the optimized concentration levels found in numerical simulations with sufficient accuracy to be useful in fiber design.

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