Abstract: A device is provided for stabilizing the frequency of an RF excitation laser, comprising a means for matching the impedance of the cavity of the laser with that at the output of the excitation generator. The matching means are connected through a line to a circulator which is connected to the generator and to an RF diode. A synchronous detector is connected to the outputs of the diode and of an oscillator. The output of the detector is connected through an integrator to a piezoelectric ceramic supporting one of the mirrors of the cavity of the laser, modulated by the oscillator. The phase shift between the signal reflected by the cavity and the signal of the oscillator and the amplitude of the former allow the cavity to be stabilized in frequency.

Abstract: A switching laser comprising, in a cavity, a cell of an amplification gas and a cell of an absorption gas, means for exciting said amplification gas and means for exciting said absorption gas. Said means for exciting the absorption cell comprise a radio frequency AC voltage source pulsed at a certain rate. The laser is namely used for infrared detection.