CHARACTERISTICS OF A SEMICONDUCTOR-LASER WITH EXTERNAL FEEDBACK

The theoretical analysis of the compound cavity of a semiconductor las er with external optical feedback is conducted. For large optical feed back, the output power from the laser and its oscillation frequency di ffer from those for small optical feedback. From the rate equations of the compound cavity, the conditions of the laser oscillation are deri ved in the presence of large optical feedback. The dependencies of the output power and the laser oscillation frequency on the external-cavi ty length are investigated. Some new results involving laser oscillati on depending on the external-cavity length are presented. The experime ntal results are compared with theoretical predictions. The dependence of the laser oscillation on the external-cavity length is qualitative ly explained in the present model.