Affiliation:
1. Shandong University
2. Celox Photonics Inc. Kunshan
Abstract
A high-energy and high-average-power pulsed fiber laser has been
investigated in a master oscillator power amplifier (MOPA)
configuration seeding with a diode laser at a programmed pulse
duration of ∼250ns . The fiber amplifier successfully
demonstrates the pulse with 21.4 mJ at the repetition rate of 50 kHz
and a maximum average output power of 1535 W with a
slope efficiency of 81.6% at 250 kHz. To overcome fiber nonlinearities
such as stimulated Raman scattering (SRS) and self-phase modulation
(SPM), extra-large mode area ytterbium (Yb)-doped step-index dual
cladding fiber has been utilized as gain fiber in the MOPA laser
system. The gain saturation effect in the power amplifier was greatly
mitigated by the programmed seed signal. This pulse-shaped MOPA system
can provide practical applications in many fields such as laser
cleaning, paint stripping, and other applications requiring special
pulse shapes.
Funder
Shandong Province Major Science and
Technology Innovation Project
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering