Affiliation: | 1. Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991, Russia 2. Optoelectronics Research Centre, Tampere University of Technology, P.O. Box 692, FIN-333101, Tampere, Finland 3. Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudnyi, Moscow Oblast, 141700, Russia
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