Interaction of modes and self-stabilization of singlefrequency emission from injection lasers

Theoretical and experimental investigations are reported of the interaction of spectral modes in an injection laser, including the case of an external dispersive resonator. A theory is proposed of a nonlinear interaction between modes which does not disappear on reduction in the intraband relaxation time and it is shown that this interaction suppresses amplification at relatively small separations (~1/τ, where τ is the carrier lifetime) from the frequency of a strong mode. Experimental observations are reported of selective self-stabilization of single-frequency emission within a band of width 1/τ. This stabilization effect facilitates generation of highly coherent radiation in injection lasers.