The effect of collector doping on the high-frequency generation in strongly coupled semiconductor superlatticeV. A. Maksimenko, V. V. Makarov, A. A. Koronovskii, K. N. Alekseev, A. G. Balanov and A. E. HramovEPL, 109 4 (2015) 47007DOI: https://doi.org/10.1209/0295-5075/109/47007