Pulsed laser oscillator in single longitudinal mode stabilised in frequency and relative operative method

摘要

The following invention refers to a pulsed laser oscillator provided with a resonant cavity (1) comprising an active material (6) located on an optical axis between at least two mirrors (3,4) so that a laser radiation oscillates between said mirrors through the active material (6), and means (8,10) suitable for energizing said active material (6) to excite it to emit a laser radiation, possible optical interrupting means (7) located along the optical axis between said material active (6) and one (4) of said mirrors (3,4) suitable for generating a pulsed laser radiation formed by succession of laser pulses (Out) in output from the resonant cavity through another (3) of said mirrors (3,4). The laser oscillator comprises means (20) outside the resonant cavity (1) suitable for illuminating said active material (6) with a continuous laser beam to make the laser oscillator function in a single longitudinal mode. The continuous laser beam is always present inside the resonant cavity (1) and the laser oscillator comprises means (2) suitable for controlling the length of said resonant cavity (1) by means of information deriving from the continuous beam in the period of time (T) between the generation of a pulse of said succession of pulses and that of the next pulse.