Experimental stability diagram of a diode laser subject to weak phase-conjugate feedback from a rubidium vapor cell

Citation
Ok. Andersen et al., Experimental stability diagram of a diode laser subject to weak phase-conjugate feedback from a rubidium vapor cell, IEEE J Q EL, 35(4), 1999, pp. 577-582
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Eletrical & Eletronics Engineeing
Journal title
IEEE JOURNAL OF QUANTUM ELECTRONICS
ISSN journal
0018-9197 → ACNP
Volume
35
Issue
4
Year of publication
1999
Pages
577 - 582
Database
ISI
SICI code
0018-9197(199904)35:4<577:ESDOAD>2.0.ZU;2-Q
Abstract
We report on a systematic experimental investigation of the dynamical behav ior of a diode laser subject to delayed feedback from a phase-conjugating m irror based on nearly-degenerate four-wave mixing in rubidium vapor. We pre sent the first experimental stability diagram for this system. In the weak feedback regime, with feedback levels up to -30 dB, we demonstrate locking to the pump frequency with a reduced linewidth smaller than 8 MHz. In contr ast to a laser with external injection, and contrary to predictions made fo r phase-conjugate feedback, the extent of this locking region is found to b e limited. For increased feedback rates, the laser leaves the locking regio n and enters an unstable region through a series of multiple sidebands spec tra, This is associated with self-excitation of the relaxation oscillation, and the observed scenario suggests a series of period-doublings after an i nitial Hopf bifurcation.