Technique for the controlled variation of the difference frequency between the two optical radiation sources, laser.

摘要

Technique for the controlled variation of the difference frequency between the two optical radiation sources, laser.Refers to the present report a new technique for the controlled variation of the difference frequency between the two optical radiation sources, laser, which uses the non-linear optical effect known as Brillouin scattering in optical fiber stimulated occurring through the intera In the parametric of the light emitted by the two laser sources.The proposed technique explores the phenomena of Brillouin amplification and or attenuation, which strongly depend on the difference of optical frequency between the two camps interagentes, to implement a control system that allows the variation of the difference frequency across The variation of the stabilized value for the amplification or attenuation Brillouin.Or through the variation of temperature or mechanical deformation subjected to the optical fiber where the Brillouin effect occurs.Four techniques are claimed, the first uses the spectrum of Brillouin amplification occurring in only one optical fiber, the second uses the spectrum of amplification brilouin occurring in only one optical fiber, the third uses the linear combination of the spectrum amplification Or attenuation Brillouin occurring independently in two or more optical fibres.The fourth and last technique uses the overlap between the spectra of Brillouin amplification or attenuation occurring in different parts of a single contiguous optical fibre.The techniques propstas find their main application as a subsystem is vital to the implementation of sensors distributed Brillouin scattering using the stimulated optical fibre and represents an alternative economically more viable when compared to the techniques conventionaI S used for the same purpose.The proposed techniques were tested and validated both experimentally and numerically, showing effective alternatives for the difference of frequency controlled variation between the two sources of laser radiation.