Importance

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Abstract

The invention features methods and systems for selectively delivering or coupling laser radiation into a first material or substrate, e.g., a first biological tissue, having a first index of refraction and not into a second material or substrate, e.g., a second biological tissue, having a second index of refraction. The system determines whether a target area corresponds to the first material or the second material by monitoring the reflection of a probe beam incident on the target area through an optical coupler at a non-normal incident angle. The monitored reflection of the probe beam is a control signal for a feedback controller that causes a treatment beam to be delivered to the target area based on the monitored reflection.

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First Claim