High energy femtosecond fiber chirped pulse amplification system with adaptive phase control.
We demonstrate increased peak power from an Yb fiber CPA system operating with strong self-phase modulation by shaping the spectral-phase of the input pulses. An adaptive control loop used feedback from the output autocorrelation. We investigated pre-compensation of both SPM phase distortion at high energies, and residual dispersion from mismatched stretcher/compressor technologies at low energies. Phase shaping resulted in improved pulse quality. When using a bulk grating stretcher, shaping increased the autocorrelation peak by a factor of 2.9, and with a fiber stretcher, shaping increased the autocorrelation peak by a factor of 3.4. High-quality 800 fs, 65 microJ recompressed pulses were produced. This technique could benefit a wide variety of fiber amplifier systems and is self-optimising for operation at both low and high pulse energies.
He
F
F
Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK.
Hung
H S S
HS
Price
J H V
JH
Daga
N K
NK
Naz
N
N
Prawiharjo
J
J
Hanna
D C
DC
Shepherd
D P
DP
Richardson
D J
DJ
Dawson
J W
JW
Siders
C W
CW
Barty
C P
CP
D000669:Amplifiers, Electronic; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D008962:Models, Theoretical; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*