MULTIPASS PULSED LASER DEVICE Russian patent published in 2014 - IPC H01S3/81 

FIELD: physics.

SUBSTANCE: multipass pulsed laser device includes a pulsed driving generator, a focusing lens, a spatial filter consisting of two lenses and, in between, a diaphragm assembly with multiple openings, one of which is a first opening and intended to guide a beam from the driving generator, and the other openings are intended to guide reflected beams, a guiding mirror placed in front of the first opening of the diaphragm assembly, a laser beam reflector in the form of a first totally reflecting end mirror, which is mounted in the focal plane of the lens of the spatial filter on the side of the guiding mirror. The optical axis of the totally reflecting end mirror and the lens is shifted from the centre of symmetry of the diaphragm assembly in a direction perpendicular to the direction of shift of the optical axis of a beam exit and return system by a distance equal to half the distance between adjacent openings of the diaphragm assembly. The device also includes a beam exit and return system consisting of a exit and return mirror placed in front of some of the openings intended to guide reflected beams, a lens and a second totally reflecting end mirror, the optical axis of which is shifted by a distance equal to half the distance between adjacent openings of the diaphragm assembly. An additional laser beam reflector in the form of a partially transparent mirror is placed at the output of the device, said mirror being placed in the focal plane of the other lens of the spatial filter, the optical axis of which passes through the centre of symmetry of the diaphragm assembly.

EFFECT: obtaining a series of pulses with a variable direction of propagation at the output of the device.

3 cl, 3 dwg