Month: February 2025

Pulsewidths, thermal relaxation times and ‘cooking’ times in photothermal treatments

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After my previous post, several people asked me to explain more about pulsewidths and thermal relaxation times, and how they relate to each other. The truth is, they are all unrelated!! They are intertwined, but not directly related. I thought it might be best to describe them using a bunch of graphs. So, I made… Continue reading Pulsewidths, thermal relaxation times and ‘cooking’ times in photothermal treatments

Fluence, pulsewidths, temperatures and cellular denaturation

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This topic is very poorly understood. How does fluence and pulsewidth relate to cellular denaturation – or, ‘cooking’ of the cells. I’m going to portray this in a series of graphs – I hope this works… When we fire light energy into the skin, we can generate some heating, if there is something in there… Continue reading Fluence, pulsewidths, temperatures and cellular denaturation

Hair removal – how does fluence relate to depth?

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We all know that light energy can kill hair follicles. It has been around since about 1996. But, many people still don’t understand the relationship between fluence and depth in the skin. Let’s begin with fluence – what is it? Simply put, fluence is just the concentration of light energy on the skin surface. If… Continue reading Hair removal – how does fluence relate to depth?