In this paper, we propose an optimized design of the picosecond MOPA fiber laser by using hybrid-doped Yb fibers. The
detailed implementation is that high-doped gain fiber with relatively small fiber core is adopted in the low-power
pre-amplifiers, thus the shortest fiber could be ensured and the thermal load is not so heavy. In the power amplifier stage,
the normal-doped large mode area gain fiber is utilized, then the thermal effects can be minimized and the output beam
quality could be ensured. The design simultaneously takes into consider the output beam quality, thermal load, nonlinear
phase shift, pulse peak power of the picosecond fiber laser. With using the existed Yb-doped fibers, we demonstrate a
high-power picosecond MOPA fiber laser with the proposed method. The average output power is up to 110 W, the total
optical conversion efficiency is 63.2%. No stimulated Raman scattering, amplified spontaneous emission and residual
pump light are observed in the output spectrum. The - 6 dB bandwidth of the output spectrum at the full output power is
~ 4 nm.
Multiwavelength seed laser can suppress stimulated Brillouin scattering (SBS) and improve the ultimate output power of
the fiber laser amplifier. Coherent combining of multiwavelength lasers/amplifiers is a promising way to get much
higher total output power than coherent combining of the single frequency lasers/amplifiers. Coherent beam combining
of stimulated Brillouin scattering based multiwavelength fiber lasers is proposed and demonstrated. Multiwavelength
laser is generated using stimulated Brillouin scattering effect by seeded a 10 kilometer single mode fiber laser with a
single frequency laser and phase locking is achieved using stochastic parallel gradient descent (SPGD) algorithm.
Experiment results shows that more than 15 wavelengths are generated for the laser. With active phase control, mean
power of the main-lobe in close-loop is 1.37 times of that value in open-loop and the visibility of the long exposure
interference pattern is 0.37. Scale up this architecture to higher power involves introduction of power amplifiers,
increasing channel number of amplifiers and power of each individual amplifier.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.