Anthracene, laser light

There are many variations on these basic systems of autocorrelation and up-conversion. In the former the SHG crystal can be replaced by a solution of molecules which can be excited only by light of frequency 2v anthracene for example cannot be excited directly by a laser light of 532 nm, but will fluoresce when excited by two photons. 

The phase-separated structures of the DPB/PB mixtures were observed by LSCM with an incident laser beam wavelength A of 364 nm. A band pass filter (395-440 nm) installed in front of the detector (photomultiplier) was used to detect only fluorescence from the anthracene molecules that were labeled only to the PB. The PB phase was recognized as a bright phase under the fluorescent LSCM (see Fig. 10). The intensity of fluorescence from a particular point in a focal plane (x-y or lateral plane) at a given depth z, I x,y,z), was recorded by the detector behind a pinhole ( confocal pinhole ) which efficiently excludes out-of-focus light, thus achieving an excellent depth resolution. Here, the z -axis denotes the optical axis of the micro-... 

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