We demonstrated the amplification of a radially polarized beam by using an Yb-doped double-clad fiber. The output power of the amplified beam reached 21 W at pump power of 30 W. The generation of amplified spontaneous emission was suppressed by applying a seed beam with sufficient power. Although the intensity distribution of the seed beam was well maintained after the amplification, partial transformation of radial polarization to azimuthal polarization was observed.
© 2014 Optical Society of America
Original Manuscript: March 6, 2014
Revised Manuscript: April 13, 2014
Manuscript Accepted: April 14, 2014
Published: May 6, 2014
Shinya Kanazawa, Yuichi Kozawa, and Shunichi Sato, "High-power and highly efficient amplification of a radially polarized beam using an Yb-doped double-clad fiber," Opt. Lett. 39, 2857-2859 (2014)