Patent ID: 8253937

Claim:
An optical evaluation method, comprising: using one of stimulated fluorescence, stimulated Raman gain and stimulated Raman loss for generating a first optical signal and a second optical signal; directing first laser pulses of a first type and second laser pulses of a second type that differs from the first type onto a sample to be examined; hitting the sample with first incident light from the two laser pulses in at least one manner of simultaneously, within a very short time lag between the two laser pulses, and a time-correlated manner of the two laser pulses, thereby generating a first optical signal; hitting the sample with second incident light from the two laser pulses in at least one manner of non-simultaneously, not within a very short time lag between the two laser pulses, and a non-time-correlated manner of the two laser pulses, thereby generating a second optical signal; detecting the generated first and second optical signals with at least one detector; and generating an electronic difference between the first and second optical signals.