Highly efficient all-glass double-clad ytterbium doped holey fiber laser

Summary from only given. We present a highly efficient single-mode all-glass double-clad ytterbium doped HF laser and show that HF technology allows versatile designs for cladding pumped fibers. A technique for achieving single-mode operation in HFs while incorporating with active dopants is also discussed. Under CW operation, the power conversion efficiency is measured to be more than 80%, which is comparable to the best conventional ytterbium doped fiber lasers. Furthermore, Q-switching and mode-locking operation of this fiber laser is demonstrated.