Methods, devices and systems for linear polarization of a laser beam are provided. In one aspect, a polarization system includes: a first polarizer having a first polarizer surface for linear polarization of a laser beam propagating in a first direction and striking the first polarizer surface at a first angle, a phase shifter configured to rotate a polarization direction of the linearly polarized laser beam transmitted at the first polarizer surface by a predetermined rotation angle, and a second polarizer having a second polarizer surface, the linearly polarized laser beam striking the second polarizer surface at a second angle after having passed through the phase shifter and being transmitted by the second polarizer surface. An incidence plane of the laser beam striking the second polarizer surface is rotated by the predetermined rotation angle relative to an incidence plane of the laser beam striking the first polarizer surface.