sentences:  The achievement of the first 300ºK continuous wave diode laser was reported in "Investigation of the influence of the AlGaAs-GaAs heterostructure parameters on the laser threshold current and the realization of the continuous emission at the room temperature" 
  
  Dmitri Garbuzov received his Ph.D. in 1968, and Doctor of Science degree in 1979.In the Russian system, the Doctor of Science is the second doctoral degree which is awarded to suitable candidates who can lead research.The 1970 demonstration of the first room-temperature diode laser crowned years of scientific and technological research developments involving optical semiconductors.