The method allows different focal spot diameters and different ablated or cured line widths to be rapidly selected and ensures that the beam shape in the focal spot remains constant and the depth of focus is always maximized.
The purpose of the present invention is to provide a rod lens array, which has a deep depth of focus and a small depth of focus spot.
The focal length has a greater tolerance and the depth of focus is substantially enhanced.
An ophthalmic lens for providing enhanced or extended depth of focus includes an optic having an aperture disposed about an optical axis.
The disclosure is directed to providing high resolution stereoscopy with extended depth of focus.
The system may be used to form precise vias within integrated circuits even in the presence of misfocus or misalignment.
A focus depth is specified either by a user or from within the system for each image frame.
In response, an image that includes an apparent focus plane corresponding to the level of accommodation of the viewer (32) is provided on the large DOF display (54).
Metrology tools are used to analyze the detected or recorded image in the volume of space through the depth of focus in a single step or exposure to determine the imaging characteristics of an optical system.
The light modulator (23) is provided within a depth of focus of the laser beam which has its focal point intermediate between the light modulator (23) and an image-forming lens (24).
The spatial slopes are integrated, in a processor (38), to generate a topographical map representative of surface portion of the specimen that are within the depth of focus of the objective.
A high-bandwidth SPM tip scanner includes an objective (34) that is vertically movable within the scan head to increase the depth of focus for the sensing light beam.