INTRACAVITY SPECTROSCOPY WITH AL2O3-TI3+ LASERS PUMPED BY SHORT PULSES

An effective and simple intracavity laser spectroscopy method is propo sed and investigated. This method is based on the feasibility of a con siderable increase in the duration of lasing and of control of this du ration within wide limits in systems with a longitudinal relaxation ti me considerably longer than the duration of pumping. The results of an experimental investigation show that the use of a Al2O3:Ti3+ laser ca n enhance additionally (by a factor of 10(2), which may be increased t o similar to 10(3)) the sensitivity of this method, compared with noni ntracavity absorption spectroscopy. The sensitivity control interval w as 10(-4)-10(-5) cm(-1). A distinguishing feature of the method is the use of a special algorithm for the processing of signals in order to eliminate the influence of strong fluctuations of the laser radiation energy (duration).