Output spectrum of Yb-Ho pulsed fiber laser All fiber Yb-Ho pulsed laser

Abstract: For the first time we have suggested and realized passive Q-switched Yb-doped fiber laser with a saturable absorber based on Ho-doped fiber laser. The pulse duration was of 250 ns, the pulse energy -70 μJ, the peak power -300 W. The laser is perspective for technology processes. Possible ways of laser characteristics improving are discussed. At present CW Yb-doped fiber lasers [1] have found different applications. Q-switched fiber lasers due to high pulse energy allow one to increase a number of applications including medicine, material processing, range finding etc. Q-switched oscillation can be obtained using outer electro-or magnetomechanical devices Thus, Cr-doped fiber was used as absorber in Nddoped fibe

Q409VAS 65..68

Abstract. The properties of the cladding modes of an optical fibre, excited by photoinduced long-period fibre gratings, were investigated by the near-and far-field methods. It is shown that the cladding modes considered are of the HE 1m type. A satisfactory agreement between the experimental and calculated distributions of the electromagnetic field of the modes is demonstrated. It was found that the propagation length of a cladding mode in the unperturbed fibre reaches 1 m

OLCR characterization of long period grating induced cladding modes

The group index of well-defined cladding modes has been characterized for the first time to our knowledge by optical low-coherence reflectometry (OLCR) with a precision <10-4. Very good agreement between theoretical and experimental results has been obtaine

Single-mode Yb-free Er-doped all-fiber laser cladding-pumped at 976 nm with record efficiency of 40 % and output power of 75W

International audienc

Yb-free Er-doped all-fiber amplifier cladding-pumped at 976 nm with output power in excess of 100 W

In this paper we present results on power scaling of Er-doped fiber amplifier pumped by multimode diodes at 976 nm. Using an optimized active fiber design including a 34 μm single-mode core with proper Er3+ and co-dopant concentrations we obtained an output power of 103 W at 1585 nm for a pump conversion efficiency of 37 % in an amplifier scheme. To the best of our knowledge the output power is the highest power ever reported for Er-doped fiber lasers pumped at 976 n