Patent ID: 6034804
Filing Date: 2000-03-07
Classification: G02B

Abstract:
An optical scanning system for developing high-resolution, near-surface images from a desired surface topology of a sample, said optical scanning means comprising:a light source for producing a collimated light beam;a first optical system for directing the collimated beam to a first position on a first optical axis;a first scanner device having a fist center portion for scanning the collimated light beam from said light source through said first optical system to said first position on said first optical axis with a constant path length in a first dimension;said first scanner device is comprised of a scanner and a mirror having said first center portion and being attached to said scanner;said first optical system comprises:first and second focusing lenses;said mirror and said first and second focusing lenses forming a 4-f lens system, said first focusing lens being disposed one focal length away from said first center portion, said first and second focusing lenses being disposed two focal lengths away from each other, and said second focusing lens being disposed one focal length away from said first portion on said first optical axis;a second scanner device having a second center portion for scanning the scanned collimated light beam from said first portion on said first optical axis along a second optical axis orthogonal to said first optical axis, wherein said second scanner device is comprised of a scanner and a mirror having a second center portion and being attached to said scanner; anda second optical system for focusing the collimated light beam onto the desired surface topology in a second dimension, wherein said second optical system comprises a third focusing lens disposed one focal length away from said second scanner device and one focal length away from said sample;said first and second scanner devices cooperatively operating to cause the collimated light beam to scan the desired surface topology of the sample with a focused constant optical path length in both of said first and second dimensions of said sample.