2019/07/11 by Azzurra Bigioli, Bigioli, A., Djamal Gacemi +24
Chemistry · Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Applied Physics (physics.app-ph) #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Semiconductor Lasers and Optical Devices #Semiconductor Quantum Structures and Devices #Spectroscopy and Laser Applications
paper · pdf · doi:10.48550/arxiv.1907.05355
openalex publication_date 2019/07/11 · openalex created_date 2019/09/05 · openalex updated_date 2026/08/01
A room-temperature mid-infrared (9 um) heterodyne system based on\nhigh-performance unipolar optoelectronic devices is presented. The local\noscillator (LO) is a quantum cascade laser, while the receiver is an antenna\ncoupled quantum well infrared photodetector optimized to operate in a\nmicrocavity configuration. Measurements of the saturation intensity show that\nthese receivers have a linear response up to very high optical power, an\nessential feature for heterodyne detection. By an accurate passive\nstabilization of the local oscillator and minimizing the optical feed-back the\nsystem reaches, at room temperature, a record value of noise equivalent power\nof 30 pW at 9um. Finally, it is demonstrated that the injection of microwave\nsignal into our receivers shifts the heterodyne beating over the bandwidth of\nthe devices. This mixing property is a unique valuable function of these\ndevices for signal treatment.\n