Thermal Relaxation Time – what is wrong with it?

  The theory which has underpinned many skin-laser treatments since 1981 is called ‘Selective Photothermolysis’. It is based on matching the laser wavelength to the absorbing chromophore. It also matches the pulse duration of the laser to the thermal relaxation times of those targets. However, there is a problem with this approach. The thermal relaxation… Continue reading Thermal Relaxation Time – what is wrong with it?

“No Pain, No Gain” – hair removal using light energy!

OK! PDF version This is really quite simple! Human thermal/pain receptors (nociceptors) are triggered at around 45 C. Below that temperature you feel heat – above it, and you feel pain. NASA has proved this beyond doubt! So, to achieve permanent, or even ‘semi-permanent’ hair removal you need to apply sufficient heat energy, for a… Continue reading “No Pain, No Gain” – hair removal using light energy!

Pain relief during laser tattoo removal – a new technique

Article Back in 2012 I carried out a wee experiment to try to speed up the tattoo removal process. I figured that if I compressed the skin, using a glass slide, then everything in the dermis would be a bit closer to the skin surface. Hence, perhaps the whole process might be accelerated a wee… Continue reading Pain relief during laser tattoo removal – a new technique

Q-switched laser removal of tattoos: a clinical and spectroscopic investigation of the mechanism, 1996

via Q-switched laser removal of tattoos: a clinical and spectroscopic investigation of the mechanism | DeepDyve A lot of patients kept asking me why green ink was so difficult to remove with the ruby laser. At the time we didn’t know. So I gathered a bunch of tattoo inks from Terry’s Tattoos in Glasgow and… Continue reading Q-switched laser removal of tattoos: a clinical and spectroscopic investigation of the mechanism, 1996

Variable pulsewidth vascular system for dermatology | (1994) | Gustafsson | Publications | SPIE

via Variable pulsewidth vascular system for dermatology | (1994) | Gustafsson | Publications | Spie    This report describes the world’s first IPL system, developed by Morgan Gustafsson in the early 1990s. Back then we didn’t call it IPL – that name came later. Morgan approached me at an ASLMS conference after I gave a… Continue reading Variable pulsewidth vascular system for dermatology | (1994) | Gustafsson | Publications | SPIE