Abstract

With a tapered double-clad all-glass ytterbium fiber as a gain medium, a maximum output power of over $200\mathrm{W}$ at $1079\mathrm{nm}$ and a slope efficiency of over 70% were demonstrated. The tapered double-clad fiber concept allows for using low-brightness diode bars and results in cost-effective and efficient high-power fiber lasers. The adiabatic conical fiber gain waveguide combines improved pump absorption owing to enhanced mode mixing in the pump cladding, low-noise single fundamental mode operation with $M^2⩽1.02$, and strong potential for significant power scaling.

© 2008 Optical Society of America

Double clad tapered fiber for high power applications

V. Filippov, Yu. Chamorovskii, J. Kerttula, K. Golant, M. Pessa, and O. G. Okhotnikov
Opt. Express 16(3) 1929-1944 (2008)

600 W power scalable single transverse mode tapered double-clad fiber laser

V. Filippov, Y. Chamorovskii, J. Kerttula, A. Kholodkov, and O. G. Okhotnikov
Opt. Express 17(3) 1203-1214 (2009)

Highly efficient 750 W tapered double-clad ytterbium fiber laser

Valery Filippov, Juho Kerttula, Yuri Chamorovskii, Konstantin Golant, and Oleg G. Okhotnikov
Opt. Express 18(12) 12499-12512 (2010)

Principles and performance of tapered fiber lasers: from uniform to flared geometry

Juho Kerttula, Valery Filippov, Yuri Chamorovskii, Vasily Ustimchik, Konstantin Golant, and Oleg G. Okhotnikov
Appl. Opt. 51(29) 7025-7038 (2012)

High-power photonic-bandgap fiber laser

Sébastien Février, Dmitry D. Gaponov, Philippe Roy, Mikhail E. Likhachev, Sergei L. Semjonov, Mikhail M. Bubnov, Evgeny M. Dianov, Mikhail Yu. Yashkov, Vladimir F. Khopin, Mikhail Yu. Salganskii, and Aleksei N. Guryanov
Opt. Lett. 33(9) 989-991 (2008)