Optogalvanic Laser Frequency Stabilization

The CO2 laser radiation field intensity is large enough and when is varied it introduces significant changes in the laser plasma microscopic parameters such as discharge sidelight intensity, plasma impedance and gas temperature. From among these parameters, a distinct interest is given to plasma impedance, because it is possible to establish a direct correspondence between laser radiation field intensity changes and some electrical characteristics (current, voltage), which can be detected and used in electronic feedback systems, so avoiding special transducers such as optical, acoustooptical or pressure transducers.