The Myth of Photon Recycling

nophotrecPhoton 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,… Continue reading

Beam profiles: Top hat vs. gaussian

The short video illustrates the differences between gaussian beam profiles and top-hat beam profiles showing the typical energy distribution. The useful energy and the diameter or a top-hat profile are shown to be well defined, whereas a gaussian profile leaves lots of room for marketing interpretations of the beam specifications. When discussing gaussian beam parameters it is important to be precise with regard to terminology. Continue reading

Anatomy of an IPL hand piece

This video gives a simplified view of the components common to almost all IPL handpieces, and demonstrates their primary functions. Flashlamps are typically standard components that can be supplied from several vendors, though their performance and lifetime are highly influenced by how the lamps are energized. All IPLs have a reflector to concentrate optical energy, a light guide to direct light to the surface of skin, and a filter to select the spectral energy delivered. Continue reading
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