Nonlinear photothermal imaging
Abstract
A new technique is described whereby one can extract the nonlinear photothermal properties of a sample in photothermal microscopy. The basic scheme relies on chopping a pump heating beam at omega and detecting the temperature variation of the sample using a linear temperature sensor (in the considered case a mirage detector) tuned to 2 omega. Harmonic images of cracks and other samples show very high contrast when compared with the fundamental image.
- Publication:
-
Applied Physics Letters
- Pub Date:
- January 1986
- Bibcode:
- 1986ApPhL..48..218W
- Keywords:
-
- Fractography;
- Imaging Techniques;
- Microscopy;
- Thermal Mapping;
- Image Contrast;
- Laser Heating;
- Microcracks;
- Nondestructive Tests;
- Nonlinear Systems;
- Instrumentation and Photography