S.P. Craig

The absorption and fluorescence spectra of rare earth ions in silica-based monomode fiber

Rare-earth ions have been systematically incorporated into the cores of silica-based optical fibers, and the absorption and fluorescence spectra have been measured. The results provide basic data for a wide range of possible future fiber-based devices. For specific telecommunications applications, ions that could be useful for sources in the 1.3- mu m and 1.5- mu m low-loss windows are identified. It is suggested that Er/sup 3+/, Nd/sup 3+/, and Tm/sup 3+/ are the most promising ions for semiconductor pumping with GaAs-based laser diodes. >

The fabrication, assessment and optical properties of high-concentration Nd3+- and Er3+-doped silica-based fibres

Abstract A method has been developed to fabricate and quantify silica-based fibres doped with high concentrations of Nd3+ and Er3+. These fibres are based on an Al2O3-P2O5-SiO2 core glass and are free from cluster centres, indicating their potential as components in short length devices.

A Nd 3+ -doped cw fiber laser using all-fiber reflectors

We demonstrate a novel all-fiber resonant optical cavity which uses two-fiber reflectors, each formed by a single loop of fiber between the output ports of a fiber directional coupler. The reflectivities of the fiber mirrors are each determined by the coupling ratio and the insertion loss of the fused couplers. When the cavity is formed in this way using a continuous length of Nd(3+)-doped fiber and pumped using a GaAs laser diode, lasing occurs at a wavelength of 1064 nm. Both theoretical and practical descriptions of the device are given.

The fabrication and optical properties of Nd3+ in silica-based optical fibres

Abstract We discuss the fabrication and optical properties of Nd3+-doped silica-based optical fibres as a function of core glass composition. The absorption and fluorescence spectra are shown to be very dependent on P2O5 concentration. This has resulted in multi-component host glass type optical behaviour from silica-based fibres.

Optical and structural analysis of neodymium-doped silica-based optical fibre

Abstract Silica-based optical fibres have been doped with up to 15 wt% Nd 3+ . Time-resolved fluorescence spectra and structural analysis show that phase separation results only when Nd 3+ concentrations exceed 7 wt%.

New all-fiber laser

We describe a Nd3+-doped fiber laser which uses all-fiber reflectors to form the resonant cavity. The mirrors, each made using a loop of doped single-mode fiber between the output ports of a fused tapered coupler1 (Fig. 1), are used in series with a length of doped fiber to form a structure which resembles an all-fiber Fabry-Perot laser (Fig. 2). A continuous length of doped fiber may be used to make the device.