Open AccessNanosecond vortex laser pulses with millijoule pulse energies from a Yb-doped double-clad fiber power amplifier
Author(s) -
Mio Koyama,
Tetsuya Hirose,
Masahito Okida,
Katsuhiko Miyamoto,
Takashige Omatsu
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.014420
Subject(s) - optics , nanosecond , materials science , fiber laser , optical vortex , laser , optoelectronics , physics , beam (structure)
Nanosecond vortex pulses were generated using a stressed, large-mode-area, Yb-doped, fiber amplifier with an off-axis coupling technique for the first time. A pulse energy of 0.83 mJ (corresponding to a peak power of 59 kW) was achieved at a pump power of 25.7 W. The optical-optical efficiency was measured to be 31%. The millijoule nanosecond vortex pulses will be potentially applied to novel material processing, such as metal microneedle fabrication.