Linewidth narrowing of a DFB semiconductor laser at by optical injection of an Er:ZBLAN microspherical laser
Laboratoire d'Optronique (CNRS UMR6082) ENSSAT 6 rue de Kerampont,
22305 Lannion Cedex, France
Accepted: 5 June 2001
An Er:ZBLAN microspherical laser has several laser lines around 1.55 μm with narrow bandwidths (~ 50-100 kHz). Such a laser is used as a master laser to optically inject a slave DFB semiconductor laser. We show that the slave can be easily locked by one microsphere mode only, enabling a spectral narrowing of the laser line (from 30 MHz to 67 kHz). We stress the selective process of light amplification and filtering effect by the DFB slave.
PACS: 42.55.Sa – Microcavity and microdisk lasers / 42.60.Da – Resonators, cavities, amplifiers, arrays, and rings / 42.60.Fc – Modulation, tuning, and mode locking
© EDP Sciences, 2001