Using laser diodes features for registration absorption lines of iodine

The problems arising from the using of red FP (Fabry-Perot) laser diodes for registration of Doppler broadened absorption lines of iodine (127I2) are considered in the paper. They represent the features of single-frequency mode regime of generation of these lasers. The influence of temperature and injection current on single-frequency operation range is one of them. Another problem is associated with a considerable slope of the dependence of the generation frequency versus temperature and current. The boundaries of single longitudinal mode regime range were defined by registration of spectrum and intensity of modes by means of scanning interferometer. To make the registration of Iodine absorption lines easier we used frequency tuning with simultaneous frequency scanning by modulation of laser current and discrete temperature tuning. Obtained results can be used for registration of another gas absorption lines and stabilization of frequency of laser diodes radiation.