Abstract: The exciton absorption and emission bands in the presence of Bose-Einstein condensation (BEC) of excitons, induced by the coherent laser radiation is considered. The laser radiation creates the coherent macroscopic polarization of the crystal, which is described as a virtual BEC of excitons. The energy spectrum of the elementary excitations as well as the probabilities of the quantum transitions depend essentially on the frequency detuning $Delta$+$MIN$/. The nonequilibrium occupation numbers of out-of-condensate excitons n$+ex$/$-q$/ arising in the presence of virtual BEC influence on the forms of absorption and emission bands.!13
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机译：摘要：考虑了相干激光辐射在激子的玻色-爱因斯坦凝聚（BEC）存在下的激子吸收和发射带。激光辐射产生晶体的相干宏观极化，这被描述为激子的虚拟BEC。基本激发的能谱以及量子跃迁的概率基本上取决于使Delta $ + $ MIN $ /失谐的频率。在存在虚拟BEC的情况下产生的凝结外激子n $ + ex $ / $-q $ /的非平衡职业数会影响吸收带和发射带的形式！13
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