Low-nonlinearity single-transverse-mode ytterbium-doped photonic crystal fiber amplifier.
We report on an air-clad large-core single-transverse-mode ytterbium-doped photonic crystal fiber with a mode-field-diameter of 35 microm, corresponding to a mode-field-area of ~1000 microm(2). In a first experiment this fiber is used to amplify 10-ps pulses to a peak power of 60 kW without significant spectral broadening due to self-phase modulation allowing for the frequency up-conversion of these pulses using narrow-bandwidth phase matched nonlinear crystals.
Limpert
J
J
Liem
A
A
Reich
M
M
Schreiber
T
T
Nolte
S
S
Zellmer
H
H
Tünnermann
A
A
Broeng
J
J
Petersson
A
A
Jakobsen
C
C