Abstract
Cutting tissue with laser radiation is widely used and has promising future applications. High precision in all three dimensions (lateral and depth) is essential for the applicability of laser systems in neurosurgery.1 The depth of cuts produced in tissue by laser light depends strongly on its intensity on the surface of the target.2 For the laser to become a truly reliable instrument in a surgeon's hand, it is, therefore, imperative that the distance from the focus of the incident radiation to the surface of the target be maintained precisely at a given value.
© 1990 Optical Society of America
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