Stimulated emission kinetics of an N2 laser under pulseperiodic conditions. II. Experiment

Results are presented of an experimental investigation of the mechanism of the drop in the stimulated emission pulse power of an N₂ laser with increasing pump pulse repetition frequency. Measurements were made of the dependences of the vibrational temperature on the pulse repetition frequency and the vibrational inversion coefficients were determined for different excitation conditions of a longitudinally excited N₂ laser. The data obtained were used to plot the theoretical characteristics of a pulse-periodic laser which showed good agreement with the experiments. Investigations were made of the heterogeneous vibrational deactivation of the nitrogen molecules by different surfaces and the influence of deactivating coatings on the characteristics of a pulse-periodic N₂ laser was studied. In a sealed laser with a deactivating coating of cupric oxide, an average output power of 0.3 W was obtained at a pump pulse repetition frequency of 2 kHz.