Lateral and longitudinal coupled waveguides in semiconductor lasers.
A semiconductor laser including two laterally coupled waveguides, in which one of the waveguides includes a partially reflecting surface (an internal mirror) between its facets, is analyzed. The internal mirror inserts longitudinal coupling into the system. The spectrum of the Fabry-Perot modes exhibits modulation in the gain required for lasing threshold, with a periodicity that depends on the longitudinal position of the internal mirror. The combined coupled-cavity effect may explain the observed gain spectrum in GaN lasers.
Department of Electrical Engineering, Microelectronics Center and Solid State Institute, Technion, Haifa 32000, Israel. orsk@tx.technion.ac.il
Orit
O
Skorka
Joseph
J
Salzman