Investigation of dynamics of radiation spectrum of injection lasers by infrared impulse Fourier spectroscopy

An infrared pulsed Fourier spectroscopy method is developed for investigating non-steady state processes in radiation which occur during pulsed pumping of injection lasers. The method can be employed for wavelengths exceeding 1.3 micrometers, where electrooptical chronography is impossible because of the uavailability of photocathodes with the appropriate red boundary. Spectral dynamics are investigated experimentally by obtaining the autocorrelation function of the field using a Michaelson interferometer, employing a high speed photodiode with high sensitivity at the emitted wavelengths, and employing a strobing device to investigate the temporal behavior of the process occurring in the spectrum. A diagram of the experimental set up is presented. The proposed method is more sensitive than the standard approach employing a monochromator and strobed photodetector.