METHOD OF FOCUSING OPTICAL RADIATION ON OBJECT Russian patent published in 2019 - IPC G02B23/06 

FIELD: instrument engineering.

SUBSTANCE: invention relates to optical instrument engineering, in particular to methods of optical guidance and aiming, and can be used to solve a wide range of technical tasks, such as creation of plasma, acceleration of particles, generation of ultrashort X-ray pulses. Method for focusing optical radiation on an object involves forming a collimated beam of laser radiation to be focused on an irradiation object, adjustment of a video monitoring device (VMD) to a laser beam, formation of an image of an object in the VMD observation plane, on which focusing is performed, forming a reference, installation of an object, at which its sharp image is realized in the VMD, determining the position of the object taking into account the reference characteristics and concentration of the beam on the surface of the object with a focusing lens. At that, in advance on the surface of the object a marking is applied in the form of a straight line with length l and width d_l, whose length l is selected from the condition l>t/(cos(α)), where t is length of focal volume (mcm); α is the angle of inclination of the surface of the irradiated object to the optical axis of the focusing lens (deg); width d_l line is selected from the condition d_l≤(1/3÷1/5) d, where d is the diameter of the focal spot of the focusing lens (mcm), on the reference image, a center of symmetry is determined by points with centrally symmetric distribution of illumination, the irradiated object is installed such that the applied to the surface direct line is located in the plane of incidence of the beam, and the irradiated object is moved to align the center of symmetry with the image of the focus of the focusing lens.

EFFECT: possibility of focusing radiation on an inclined object.

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