Influence of an external mirror on the characteristics of semiconductor laser radiation

An investigation was made of the characteristics of the radiation emitted by injection lasers with an external mirror and different levels of the optical coupling. Variation of the optical length of a laser or of the external resonator modulated the emission wavelength and radiation power and such modulation differed in the case of weak and strong coupling with the external mirror. In general, power modulation had two components (fast and slow) and a tilt of the external mirror gave rise to an additional component.