Injection laser with a ring resonator
Abstract
The generation of oppositely directed waves (ODWs) in a ring resonator with a nonreciprocal phase element (NPE) is investigated experimentally. The apparatus is similar to that described by Bogatov et al. (1982) and comprises a CW AlGaAs planar-heterostructure active element with its stripe contact at 13 deg from the normal to the output face, collimating lenses, mirrors and a diffraction grating to form the resonator, a Fabry-Perot etalon to narrow the spectrum, and a Faraday cell (with a flint-glass core, solenoid windings, and two quarter-wave plates) as the NPE. The optical arrangement, the ODW interference patterns, and the variation of wave intensity with pump current and magnetic-field strength are presented graphically and discussed. The interference pattern is found to be unaffected by switching on the NPE, regardless of the magnetic field and over the entire frequency-splitting range (0-25 MHz), indicating that the frequencies of the ODWs are equal and do not follow the frequency of the resonator. The intensities of the ODWs are anticorrelated at a given input power.
- Publication:
-
Technical Physics Letters
- Pub Date:
- April 1984
- Bibcode:
- 1984TePhL..10..166B