System of multifrequency terahertz laser´s cavity tuning

Frequency tuning of the terahertz laser´s cavity technique is presented. The method allows setting of needed frequency shift (relative to a laser active medium central line lasing) value, without using of the frequency measurement equipment. Compound terahertz cavity scheme is proposed, which makes possible instantaneous choosing of several fixed frequencies within laser active material lasing line. Frequency stabilizing of the operating channels tuning provided by a control channel in the compound cavity.