Page 12 - Chapter 3 - An Introduction to Laser/IPL Hair Removal

Table of Contents
Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
Section 3.1 – Overview of Hair Removal Using Light Energy 16
Hair Removal using Light Energy – in a nutshell 17
The basic parameters (settings) on lasers and IPLs 20
The Epidermis and Skin Colour 25
Melanin and its effects on hair removal (Absorption Coefficients) 26 Skin Colour and melanin concentration 27 Hair colour & skin colour – contrast – why this is so important 31 Skin Colour 6 – ‘Black’ skin 32
Epidermal temperature rise due to skin colour 32
Tans – Sun or sunbeds 36 Hirsutism and Hypertrichosis 36 Melanin Absorption, Skin Colour and Pain 37
Laser / IPL Treatment of Hair – the Fundamentals in more detail 38
The Fundamental Principles of Light-based Hair Removal Treatments 39 Management of Safe and Efficient Light-based Skin Treatments 40 Light Absorption in Epidermal Melanin 41 Optimal Skin Cooling in Laser Hair Removal 42 Thermal Pain Sensors 46
Laser Hair Removal – A Thermo-Chemical Process 48
Thick and thin hair – how much light energy do they absorb? 51 What does this mean for light-based hair removal treatments? 52 Skin Cooling 53 “Over-cooling” the treatment area is virtually impossible!! 56 Depth of the germ cell bulges in hair follicles 57 How the anatomy of target and absorbing tissue determines the pulse duration 58 Hair depth and fluence 59 Melanin absorption – how they compare across devices? 61 Dormant Follicles 62 Epidermal Complications 62 Dermal Complications 63 Skin diseases and disorders 63 What cannot be treated? 64 Proper language when talking to clients/patients 64
Treatment Timings 64
What are the optimum hair removal intervals? 64 How much hair is lost following treatments? 72 Hair treatment intervals – what is the ‘best’ time to leave between sessions? 74
Section 3.2 – Science / Biology 78
The Important Science and Biology Involved with Hair Removal 79
Basic Terms You Really Should Understand 79 Selective heating - The impact of object colour vs the colour of light 80 Fundamental optical properties of the skin 82 Penetration Depth 83 Fluence and penetration depth 85 Fluence and Skin Cooling 88
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© The Laser-IPL Guys, 2022
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