Laser surface profiler
Optics Letters, Vol. 24, Issue 7, pp. 457-459 (1999)
http://dx.doi.org/10.1364/OL.24.000457
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Abstract
By accurate measurement of the angle of reflection of a laser beam that is incident upon a reflective surface with a position-sensitive detector, changes in the surface-normal direction (the slope or the derivative of the surface) can be determined directly. An instrument has been built that makes repeated measurements over the surface and uses the collected data to produce a gray-scale image of the slope. The resolution of this system for detecting changes in the surface-normal direction is found to be better than 0.01°. By focusing of the laser beam to achieve a lateral resolution of 5 μm , the resolvable surface-height change owing to a variation in slope is estimated to be <1 nm .
© 1999 Optical Society of America
OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.4630) Instrumentation, measurement, and metrology : Optical inspection
(120.5700) Instrumentation, measurement, and metrology : Reflection
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
Citation
An-Shyang Chu and M. A. Butler, "Laser surface profiler," Opt. Lett. 24, 457-459 (1999)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-24-7-457
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