TY - GEN AU - Barbieri,S AU - Alton,J AU - Beere,H E AU - Linfield,E H AU - Ritchie,D A AU - Withington,S AU - Scalari,G AU - Ajili,L AU - Faist,J TI - Heterodyne mixing of two far-infrared quantum cascade lasers by use of a point-contact Schottky diode SN - 0146-9592 PY - 2004///0921 N1 - Publication Type: Journal Article UR - https://doi.org/10.1364/ol.29.001632 ER -