Title :
Gain studies of phonon-depopulation based terahertz quantum cascade lasers using terahertz time domain spectroscopy
Author :
Dhillon, S. ; Jukam, N. ; Oustinov, D. ; Madeo, J. ; Rungsawang, R. ; Colombelli, R. ; Dean, P. ; Salih, M. ; Khanna, S.P. ; Linfield, E.H. ; Davies, A.G. ; Tignon, J.
Author_Institution :
Lab. Pierre Aigrain, UPMC, Paris, France
Abstract :
Gain and losses in a LO-phonon THz QCL are studied using TDS. At threshold the gain clamps at 25cm-1 and the gain FWHM is 0.6THz. At low biases, absorption features are observed below and above the laser frequency. They are shown to originate from the population of a parasitic electronic channel.
Keywords :
microwave photonics; optical losses; phonons; quantum cascade lasers; terahertz wave spectra; absorption properties; gain clamps; laser frequency; longitudinal-optical phonon; parasitic electronic channel population; phonon-depopulation based terahertz quantum cascade lasers; terahertz time domain spectroscopy; Broadband antennas; Current density; Electric fields; Measurement by laser beam; Quantum cascade lasers;
Conference_Titel :
Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010 35th International Conference on
Conference_Location :
Rome
Print_ISBN :
978-1-4244-6655-9
DOI :
10.1109/ICIMW.2010.5612816
