In the hall of the exhibition “Development of physics and technology of lasers in the Academy of Sciences of the BSSR and their practical application”, dedicated to the 20th anniversary of the research conducted by Belarusian scientists in the field of creating new optical quantum generators in the exhibition hall of the Presidium of the Academy of Sciences of the BSSR on December 3, 1981, Minsk Photohronika BelTA, V.Semenov