A lot of problems in spectroscopy and remote sensing of the atmosphere demand the use of two-channel systems, which generate pulses with different wavelengths and minimum mismatch DT between pulses. To attain to this end, it is suggested to control the Q-factors of laser cavities using smooth positive cross feedback. According to the results of computer simulation, this feedback provides DT about a fraction of nanosecond. The degree of influence of laser system parameters on DT is determined.