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Extended single-mode photonic crystal fiber lasers

: Limpert, J.; Schmidt, O.; Rothhardt, J.; Röser, F.; Schreiber, T.; Tünnermann, A.; Ermeneux, S.; Yvernault, P.; Salin, F.

Postprint (715 KByte; PDF; )

Optics Express 14 (2006), No.7, pp.2715-2720
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

We report on an ytterbium-doped photonic crystal fiber with a core diameter of 60 µm and mode-field-area of about 2000 µm2 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 µm core fiber with a similar design reveals the potential of extended large-mode-area photonic crystal fibers.