Abstract: A method of focusing includes irradiating an object by directing radiation output by a radiating source through an objective lens, measuring a first intensity of reflected radiation that is reflected from the object, adjusting a distance between the objective lens and the object, measuring a second intensity of reflected radiation, and analyzing the first intensity of reflected radiation and the second intensity of reflected radiation to determine a focal distance between the objective lens and the object. The distance between the objective lens and the object is adjusted to the focal distance and the irradiating intensity is increased to mark the object. In another example, measuring the first intensity of reflected radiation is performed by directing reflected radiation from the object through the objective lens, a beam splitter, a focusing lens, and a pinhole and onto a sensor that outputs a signal indicative of sensed radiation intensity.

Abstract: An inspection system may include an optical component configured to deliver inspection light to a subject and a detector configured to obtain an image of the subject based on the inspection light delivered to the subject. The inspection system may also include a processor in communication with the optical component and the detector. The processor may be configured to: measure an aberration of the optical component based on the image of the subject obtained by the detector; and adjust the optical component to compensate for a change in the aberration.

Abstract: A method of focusing includes irradiating an object by directing radiation output by a radiating source through an objective lens, measuring a first intensity of reflected radiation that is reflected from the object, adjusting a distance between the objective lens and the object, measuring a second intensity of reflected radiation, and analyzing the first intensity of reflected radiation and the second intensity of reflected radiation to determine a focal distance between the objective lens and the object. The distance between the objective lens and the object is adjusted to the focal distance and the irradiating intensity is increased to mark the object. In another example, measuring the first intensity of reflected radiation is performed by directing reflected radiation from the object through the objective lens, a beam splitter, a focusing lens, and a pinhole and onto a sensor that outputs a signal indicative of sensed radiation intensity.

Abstract: Inspection systems and methods for adjusting/optimizing imaging performances of the inspection systems are disclosed. An inspection system may include an optical component configured to deliver inspection light to a subject and a detector configured to obtain an image of the subject at least partially based on the inspection light delivered to the subject. The inspection system may also include a processor in communication with the optical component and the detector. The processor may be configured to: measure an aberration of the optical component based on the image of the subject obtained by the detector; and adjust the optical component to compensate for a change in the aberration.