Spectral characteristics of single-frequency mode of operation of diode lasers

The researches, which have been carried by authors, are concerned with study of single-frequency mode of operation of diode lasers generating at the wavelengths of 635 and 655 nm. In our experiments we have studied spectral characteristics of these lasers (presence of single-longitudinal-mode, inter-mode interval, range of temperature tuning of frequency of laser radiation, measurements of drift of average value of frequency in time).