IPL devices output a broad range of wavelengths which can be used to treat hair, blood vessels and pigmentation. We know that blood absorbs yellow light very strongly – typically in the region 500 to 600 nm (or thereabouts!) I trained some ladies (in ‘Mona Permanent Cosmetics’), recently, to use their IPL for telangiectasias (thread… Continue reading Treating nasal thread veins with an IPL
I’m often asked ‘how many hair removal sessions will I need using laser or IPL?’ This is not an easy question to answer because it depends on a high number of variables including your equipment, your training and, of course, your patient/client. But, I have tried to answer this question using a computer model of… Continue reading How Many Laser/IPL Hair Removal Sessions do I need to get a Good Result?
The 1st DermaLase MasterClass wil be held in September this year in Birmingham. The detals of this event can be downloaded in a pdf format from here. Here is an outline of the topics which will be discussed – if you have a particular topic which you wish to be addressed, please let us know.… Continue reading MasterClass – Birmingham – Sept 2022 – Details
When we set a fluence on an IPL unit, it is based on ALL of the light energy coming from the handpiece. However, each filter will absorb some of that energy – it is supposed to! The filters are designed to ‘block’ certain wavelengths, so that only the desired wavelengths reach the skin surface. So,… Continue reading How much light energy actually emerges from IPL filters and reaches the skin surface?
We often hear, these days, about “pain free” hair removal, with various lasers, usually diodes. But, is it true? Well, let’s look at this more closely… The aim with laser, or IPL, treatment of hair is to induce enough heat in the stem cells that stimulate hair growth in the follicles. To do this, we… Continue reading “Pain free” hair removal. Is it real?
Back in 2016 (I think) I gave a talk to the American Society of Lasers Surgery and Medicine about the theory of Selective Photothermolysis. This is the theory which underpins all of today’s photothermal laser/IPL treatments. In this talk I discuss the idea behind thermal relaxation time and how it ‘fits’ with treatments. In fact,… Continue reading Selective Photothermolysis – an in-depth explanation
All hair follicles grow according to a cycle – ‘anagen, catagen, telogen’. The follicle germative cells promote anagen hair growth at consistently regular intervals resulting in periods of active growth, followed by inactivity. The duration of these periods depends on the which part of the body is being considered. I created a computer model to… Continue reading Laser/IPL Hair Removal – How many follicles do we kill each treatment?
I wrote a blog post back in September 2021 discussing my thoughts on the how to determine the optimum interval between laser/IPL hair sessions. It proved very popular amongst my readers. But, as soon as I posted it I began to doubt my own conclusions. Back then I suggested that we should wait for an… Continue reading ￼What is the ‘best’ interval between hair removal sessions (after treatment by lasers or IPLs)? Part 2.
WARNING – This post is a bit more scientific than my usual stuff. BUT, it is worth persevering because you will (hopefully) understand more about your laser/IPL treatments, if you do… When we fire light energy at the skin, to treat hair, blood vessel, pigmentation etc, we know that some of the energy is absorbed… Continue reading How strongly do blood and melanin absorb light energy and how does this affect laser/IPL treatments?
How thick is a hair? Well, according to some research by physicist, Brian Ley (they do all the best research!!!), it ranges between 17 and 181 microns in diameter (see his results here). That is between 0.017 and 0.18 mm. So, that means that their cross-sectional areas [A = pi x (radius)2] are between 0.0000023 and 0.00026 square… Continue reading Thick and thin hair – how much light energy do they actually absorb during photothermal treatments?