- 1.- Amplifiers and lasers based on rare-earth doped
The objective of this line is to research on the design,
construction and characterization of amplifiers and lasers based on
rare-earth doped optical fibers (with applications to optical
communications, materials processing, and sensors). The work is carried out
in collaboration with the "Fiber Optics Laboratory" of the University of
In recent years we have focused our attention on photonic
crystal fibers (PCF), which have special properties that provide greater
flexibility and efficiency to amplifiers and lasers. On the other hand,
availability of a manufacturing facility of the PCF necessary at the
University of Valencia allows us to use the most appropriate fiber in each
device designed. We have worked with low concentration erbium-doped PCF (to
build amplifiers and lasers) and with high concentration ones (to build
sensors). In order to make realistic designs we have developed new
techniques for characterization and simulation of the manufactured fibers.
With a view to applications requiring higher power laser emission, we are
working on lasers based on ytterbium-doped, double clad fibers.
Another objective of this line of work is the study of the
behavior in chaotic regime of some of the lasers manufactured, for
applications to secure information transmission.
- 2.- Amplifiers and lasers based on erbium and
ytterbium-doped integrated optical waveguides.
This line focuses on the study and application of lasers
based on erbium- and ytterbium-doped integrated waveguides, written with
ultrashort laser pulses, in collaboration with the "Laser Processing Group "
from CSIC in Madrid (Spain). Our goal is the application of such lasers in
integrated circuits with a three-dimensional distribution of components in
order to increase integration density.
In recent years, we have used our experimental and
calculation techniques (in interaction with the Madrid group, which is the
waveguide manufacturer) to improve the quality of the guides to reach levels
competitive with those manufactured in different countries with the same
With the best guides, we have achieved lasing regime with the
use of cavities external to the waveguide. Ring and linear cavities with
Bragg gratings have been constructed, trying to optimize them in order to
minimize losses. In the immediate future, we will seek fully integrated and
optimize lasers with Bragg gratings written on the waveguides, instead of
using external cavities as we have done so far. Later on, we will study
using these lasers with other integrated components in three-dimensional