Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18
The re-emission microscope uses a pulsed or modulated light source for excitation. The light is focused onto the sample with an achromatic optical component, such as a suitable lens, a curved mirror or a Fresnel prism. Reemitted light, in the case of the photothermal effect in the form of infrared graybody radiation, is collected by the same optical element and is imaged back towards the light source. A dichroic element is used to separate excitation and reemission. The reemitted light is thus focused on a suitable detector. The achromatic imaging component and the dichroic beamsplitter can be combined in one element. Two different imaging elements can be used for excitation and detection, and one of them can be used as a beamsplitter.