Single-mode and single-frequency injection lasers (review)

The factors responsible for the multimode emission of injection lasers are considered and a review is given of experimental investigations of this subject. Various methods of spatial and spectral selection of the oscillation modes are described, including particularly the use of external and composite resonators. The applications of single-mode injection lasers are discussed. It is reported that such lasers are used very widely in high-resolution infrared spectroscopy.