The Myth of Photon Recycling
Photon recycling is basically an attempt to improve the efficiency of poorly designed devices. The small amount of energy provided by recycled photons can be achieved by simply turning the fluence of the device up just a few per cent. Additionally, photon recycling results in unwanted heat at the surface and almost no increase in the effectiveness at the intended target. This results in added discomfort and no increase in clinical efficacy. A best design practice for lasers and flashlamps is to reduce or eliminate this unwanted recycled light. A better choice is to increase the fluence a small amount, and use the nearly collimated direct light.that is best for reaching targets in tissue without the unnecessary extra heat at the surface.
The following presentation illustrates the problems of photon recycling.
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