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System for stabilisation of the intensity of single-mode He — Ne laser radiation

A system for stabilisation of the intensity of single-mode He—Ne laser radiation was developed and constructed. The system is based on the intracavity interaction of the fields (autodyne effect). The radiation parameters are controlled by returning some of the output radiation back to the laser cavity. A phase self-locking system makes it possible to eliminate the stochastising influence of the backscattered radiation and also to suppress by more than one order of magnitude the intrinsic low-frequency fluctuations of the laser radiation intensity.