Почему после лазера волосы растут снова? Дело в импульсе! — Transcript

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1. 0:00All laser hair removal devices operate
2. 0:03in pulse mode. This means they don't
3. 0:06shine in a constant stream, but fire in
4. 0:09bursts of light. Each such burst is
5. 0:13called a light pulse. This light pulse
6. 0:16has four characteristics that determine
7. 0:19the quality and safety of the
8. 0:21procedures. These are wavelength,
9. 0:24energy density, pulse duration, and
10. 0:27frequency. Regarding wavelengths, the
11. 0:31melanin absorption effect, as well as
12. 0:33setting energy density or fluence. We
13. 0:36spoke about these in previous videos.
14. 0:38There is a link to all four lessons
15. 0:39there. And I recommend starting with
16. 0:43those so it is clear what we will be
17. 0:45talking about here. And we will be
18. 0:48talking about pulse duration and its
19. 0:51effect on the quality and safety of the
20. 0:53procedure. As usual, the most important
21. 0:56part is at the end of the video. Watch
22. 0:59until the end. Before we start talking
23. 1:05about setting the pulse duration,
24. 1:07let’s recall some obvious facts about
25. 1:09laser hair removal. First, the hair
26. 1:13follicle is destroyed through heating.
27. 1:16Second. The follicle doesn't just need
28. 1:20to be heated, but heated to a
29. 1:22temperature that leads to its total
30. 1:24destruction, which is approximately
31. 1:2670-80 ° Celsius. Most practitioners
32. 1:33don't bring the follicle to these
33. 1:35temperatures, so the clients 'hair
34. 1:37falls out at first, but then grows back
35. 1:40. And pulse duration plays an important
36. 1:45role in this heating process. Let’s
37. 1:48recall from previous lessons. This is
38. 1:51our follicle, this is energy. And we
39. 1:55already know that there must be enough
40. 1:57energy to destroy the follicle. If
41. 2:00it’s not enough, we won’t heat it
42. 2:03enough, we won't destroy it, and the
43. 2:05hair will grow again. It seems simple,
44. 2:08but it’s not. The physics of heating
45. 2:12is not that simple. Take a frying pan,
46. 2:14put it on the fire, and place your hand
47. 2:17on top. For a while, the pan will be
48. 2:20cold, but then we will start to feel
49. 2:23the heat. Why? First, the pan heated up
50. 2:29itself to a certain temperature and
51. 2:32then started to transfer that heat to
52. 2:34our hand. The same process happens with
53. 2:38a hair follicle. At first, it heats up
54. 2:42itself, but after a while, it starts to
55. 2:44transfer part of its heat to the skin.
56. 2:48And this heat no longer goes into
57. 2:50heating the follicle itself and
58. 2:52destroying it, but instead heats the
59. 2:54surrounding skin. And the time during
60. 2:59which the follicle has already given
61. 3:01away just over half of its heat is
62. 3:03called thermal relaxation time. This is
63. 3:07a very important indicator that affects
64. 3:09the quality of the procedure. Here is
65. 3:12how this process looks. As we can see,
66. 3:16we had a sufficient amount of energy to
67. 3:19heat the entire follicle, but we
68. 3:22couldn't do it because some time after
69. 3:26heating began, the follicle started
70. 3:29losing heat, transferring it to the
71. 3:32skin. How to solve this problem? And
72. 3:35still achieve the necessary heating.
73. 3:38This is where the time during which we
74. 3:40deliver the energy will come to our aid
75. 3:43. And that is exactly what is called
76. 3:46pulse duration. If we deliver all the
77. 3:50energy so quickly that the hair doesn't
78. 3:52have time to start losing it, we will
79. 3:55succeed. And conversely, the slower we
80. 4:00do it, the more energy is lost to the
81. 4:03skin. Conclusion: to destroy the
82. 4:08follicle, you must not only deliver the
83. 4:11required amount of energy, but ensure
84. 4:13it hits the target within a specific
85. 4:16timeframe. You can apply this knowledge
86. 4:21in practice by knowing the specific
87. 4:23thermal relaxation times for both the
88. 4:26follicle and the skin. I cover this in
89. 4:30more detail during my individual
90. 4:32training sessions. Expert. You can find
91. 4:37out more about the training by filling
92. 4:39out the online form, linked in the
93. 4:41description below, or by messaging me
94. 4:42on WhatsApp. The number is on the
95. 4:46screen. Still here? Good. Now for the
96. 4:53most interesting part. Not all lasers
97. 4:56have adjustable pulse duration settings
98. 4:58. In such cases, it’s not easy to
99. 5:01determine how long the laser takes to
100. 5:04deliver energy into the skin during a
101. 5:07pulse. Furthermore, many lasers that do
102. 5:11have a pulse duration setting have
103. 5:13their primary control labels confused.
104. 5:17But this can be sorted out to make the
105. 5:20procedure manageable. Reach out, and
106. 5:22I’ll help. Invest in knowledge. It
107. 5:26always pays off. Hey