Experimentally investigated the characteristics of laser diodes (LD) operating at the wavelength of 530 nm. It is established that the contrast of the radiation power of the LD is small (less than 0.85) and very sensitive to changes in heterostructures. Contrast and radiation divergence (about one degree) are compared with the spectral characteristics of the LD.
$^1$ Department ofPhysics, Institute of Radio Engineering and Electronics, National Research University«MPEI». Moscow 111250, Russia. Krasnokazarmennayast., 17.
$^2$Faculty of Physics, Lomonosov Moscow State University.Moscow 119991, Russia.Leninskie Gory,1, b.2.