Patent ID: 7962966

Claim:
A scanning probe microscope comprising: a probe mount adapted to receive a probe having a tip that moves in response to an interaction between said tip and a local characteristic of a sample, said probe tip being mounted on a first end of a cantilever arm, a second end of said cantilever arm being coupled to said probe mount; a probe position signal generator that generates a position signal indicative of a position of said probe relative to said second end of said cantilever arm, said probe position signal generator comprising a first light source that directs a light beam at a first reflector positioned on said cantilever arm and a detector that detects a position of said light beam after said light beam has been reflected from said first reflector; and a second reflector that reflects said light beam after said light beam is reflected from said first reflector and before said light beam enters said detector, said second reflector passing light from a second light source that illuminates said sample.