Two mode operation of 4-section semiconductor laser for terahertz generation by photomixing

conference 6194 "Millimeter-Wave and Terahertz Photonics", oral session 4 "Mm-wave and THz : Optical Sources, Detectors, and Filters" [6194-19], proceedings of SPIE (ISBN 9780819462503)International audienceThe stable two-mode operation of a 4-sections semiconductor laser emitting at 1.55 µm is demonstrated and analysed. The two-mode operation only depends on the current feed in the Bragg section. The characterization of the two-mode laser operation exhibits the possibility of terahertz wave generation by photomixing using this device. An interpretation of the two-mode regime involving a saturable absorber is discussed