A polarization controller based on frequency up-conversion technology and its working method

Abstract

The invention discloses a polarization controller based on a frequency up-conversion technology and a work method thereof. A pumping unit is adopted for generating pumping lasers adjustable in power,the pumping lasers are adjusted into linear polarized light through a linear polarization unit, and signal light emitted by a signal source is adjusted into circular polarized light through a circularpolarization unit; then, the linear polarized light and the circular polarized light are emitted into a frequency up-conversion unit to generate up-conversion light, and by controlling the power of the pumping lasers, the power of the linear polarized light which is subjected to frequency up-conversion is controlled; finally, light beams emitted by the frequency up-conversion unit is subjected tophase compensation and filtered to obtain elliptical polarized signal light. The polarization controller has the advantages that by controlling the power of the pumping lasers, the incident circularpolarized light can be adjusted into the elliptical polarized light with arbitrary ellipse eccentricity, and the linear polarized light is output under the maximum conversion power. Moreover, in a polarization adjustment control process, incident signal light and output signal light are propagated colinearly, and the propagation direction cannot be changed.

Description

technical field [0001] The invention relates to the technical field of polarization control, in particular to a polarization controller based on frequency up-conversion technology and a working method thereof. Background technique [0002] In the process of wave propagation, the asymmetry between the vibration direction of the wave and the propagation direction is called polarization. It is the most obvious sign that the transverse wave is different from the longitudinal wave. Only transverse waves have polarization. Light wave is a kind of electromagnetic wave. The electric vibration vector E and magnetic vibration vector H in the light wave are both perpendicular to the propagation speed v, so the light wave is a transverse wave, which has polarization. [0003] In recent years, the research on the polarization of light has become more and more in-depth, and its application has also penetrated into many disciplines such as communication, biology, chemistry and astronomy, s...

AI Technical Summary

Problems solved by technology

The Brewster plate is a quartz plate installed at Brewster’s angle. It is commonly used in the resonant cavity of the laser. When the beam passes through the Brewster plate, the P-polarized component has no loss, while the S-polarized component will be partially reflected. When The circularly polarized signal becomes elliptically polarized light through the Brewster plate, but its eccentricity cannot be adjusted, and the propagation direction will be shifted to a certain extent, so the collinear transmission of the signal cannot be realized

Images