Laser, RF & tissue interaction: the physics behind every device decision
The mechanistic foundation for every energy-based aesthetic device — how light, heat and radiofrequency interact with skin tissue, why selectivity depends on matching three parameters at once, and how the wound healing cascade determines the timeline of every result.
4 units
~8 min each
12 checkpoints
Level: All levels — tiered content
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Unit 1
Energy & Selective Photothermolysis
Why a laser can destroy one target and spare its neighbours — wavelength, pulse duration and thermal relaxation time as one governing logic.
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Unit 2
Chromophores & Laser Classification
Melanin, oxyhaemoglobin and water as the three targets available to any laser, and how the major device classes map onto them.
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Unit 3
Fractional Laser & Radiofrequency
How fractional delivery spares surrounding skin to heal faster, and how radiofrequency heats tissue without needing a chromophore at all.
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Unit 4
HIFU & Wound Healing
Focused ultrasound reaching the SMAS without heating the tissue above it, and the four-phase healing cascade behind every treatment result.
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Each unit follows the same rhythm: a short piece of clinical content, a checkpoint that asks you to commit to an answer, then the reasoning behind it. Checkpoints are not scored and cannot be retried — committing to a position before seeing the answer is the point of the exercise. Your progress is stored on this device only.