CPC G01N 21/3577 (2013.01) [G01N 2201/06113 (2013.01)] | 44 Claims |
1. A system for widefield imaging of infrared absorption properties of a sample using a photothermal effect, the system comprising:
an infrared pump source configured to generate an infrared pump beam;
a probe source configured to generate a probe beam;
at least one pulse generator configured to initiate a series of synchronized pulses of the infrared pump beam and the probe beam;
an image sensor configured to collect:
a hot frame comprising a spatially-resolved image of probe light collected from the sample with the infrared pump beam intersecting the probe beam at the sample; and
a cold frame comprising a spatially-resolved image of probe light collected from the sample with a reduced intensity of the infrared pump beam intersecting the probe beam at the sample; and
a processor configured to measure a change between the hot frame and the cold frame to simultaneously generate a plurality of signals indicative of a level of infrared absorption at each of a corresponding plurality of spatially-resolved points on the sample.
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