DESIGN OF GRATING-BASED FIBER LASERS - POWER AND SPECTRAL BEHAVIORS

The spectral and power characteristics of Nd3+ doped silica-based fibe r lasers utilizing two intracore Bragg grating reflectors have been in vestigated. The operation of low-threshold, high efficiency Nd3+ doped fiber lasers are reported. The frequency of these lasers can be tuned to resonance with several absorption lines of atomic or molecular spe cies. Coupled cavity effects have been used to reduce the linewidth of the laser emission and to carry out a single mode Nd3+ fiber laser. T he influence of the medium birefringence on the laser emission in a lo w and in a Hi-Bi fiber is presented. Recently, a new photorefractive e ffect occurring in cerium doped fluorozirconate fibers has been demons trated in our laboratories. To demonstrate the potentiality of Bragg g ratings to fluorozirconate fiber laser technology, a fiber laser using a Bragg reflector written in a Ce-Er codoped ZBLALi fiber is reported .