J. Limpert,
O. Schmidt,
J. Rothhardt,
F. Röser,
T. Schreiber,
A. Tünnermann,
S. Ermeneux,
P. Yvernault,
and F. Salin
Extended single-mode photonic crystal fiber lasers
Opt. Express, 14 :2715 (April 2006)
Extended single-mode photonic crystal fiber lasers
Opt. Express, 14 :2715 (April 2006)
Abstract:
We report on an ytterbium-doped photonic crystal fiber with a core diameter of 60 microm and mode-field-area of ~2000 µm^2 of the emitted fundamental mode. Together with the short absorption length of 0.5 m this fiber possesses a record low nonlinearity which makes this fiber predestinated for the amplification of short laser pulses to very high peak powers. In a first continuous-wave experiment a power of 320 W has been extracted corresponding to 550 W per meter. To our knowledge this represents the highest power per unit length ever reported for fiber lasers. Furthermore, the robust single-transverse-mode propagation in a passive 100 microm core fiber with a similar design reveals the potential of extended large-mode-area photonic crystal fibers.