Doubly active Q switching and mode locking of an all-fiber laser.
Simultaneous and independent active Q switching and active mode locking of an erbium-doped fiber laser is demonstrated using all-fiber modulation techniques. A magnetostrictive rod attached to the output fiber Bragg grating modulates the Q factor of the Fabry-Perot cavity, whereas active mode locking is achieved by amplitude modulation with a Bragg-grating-based acousto-optic device. Fully modulated Q-switched mode-locked trains of optical pulses were obtained for a wide range of pump powers and repetition rates. For a Q-switched repetition rate of 500 Hz and a pump power of 100 mW, the laser generates trains of 12-14 mode-locked pulses of about 1 ns each, within an envelope of 550 ns, an overall energy of 0.65 microJ, and a peak power higher than 250 W for the central pulses of the train.
Cuadrado-Laborde
Christian
C
Departamento de Física Aplicada y Electromagnetismo, Institut Universitari de Cièncìa dels Materials,Universidad de Valencia, C/ Dr. Moliner 50, Burjassot 46100, Valencia, Spain. Christian.Cuadrado@uv.es
Díez
Antonio
A
Cruz
Jose L
JL
Andrés
Miguel V
MV