In today's episode, Mike and Lisa dive into the fundamental concepts of laser physics through a fun "Explain Like I'm Five" format. They explore key terms such as fluence, pulse width, and wavelength, breaking down complex ideas into simple analogies. Mike explains how fluence, measured in joules per square centimeter, is crucial for achieving effective results in laser treatments, while pulse width is likened to the duration of a bus journey delivering energy to the skin.

KEY TAKEAWAYS

• Fluence refers to the concentration of energy delivered to the skin during laser treatments, measured in joules per square centimeter. It is crucial for achieving effective results in procedures targeting hair follicles, blood vessels, and pigmentation.

• There is a minimum threshold fluence that must be exceeded for a treatment to be effective, as well as a maximum threshold to avoid causing damage to surrounding skin tissues. Finding the right range of fluence is essential for successful outcomes.

• Pulse width (or pulse duration) is the length of time that energy is delivered to the skin. It can vary significantly depending on the type of laser used, and it does not directly correlate with the reaction time of the tissues being treated.

• Wavelength determines the color of the light used in treatments and is measured in nanometers. Different wavelengths penetrate the skin to varying depths, which affects their effectiveness in targeting specific structures like hair follicles or blood vessels.

• The concept of useful penetration depth combines both wavelength and fluence. It is important for ensuring that the energy delivered can effectively reach and treat the intended target within the skin, especially for deeper structures.

BEST MOMENTS

"Fluence is basically how concentrated the energy is on the skin surface, in a spot."

"To me, fluence is king. That's the main driver of pretty much all these reactions."

"So fluence is basically your make or break for any of these treatments that we are doing?"

"Pulse width is just a technical thing designed into the laser, but it doesn't actually translate into the cooking or the denaturation process within the tissues."

"There's no point the bus of photons reaching the target if they're all tired and they can't do anything."

ABOUT THE HOSTS

Mike began his career in medical lasers in 1986 with a physics degree and a post-grad in bioengineering. He helped develop the scar-free removal of tattoos using a Q-Switched Ruby Laser in Glasgow, and the world's first IPL system. Known well in the industry for his hard truths, no BS attitude and logical answers. As the author of three books, articles for medical journals, a well read blog, a Laser Protection Advisor and contributor to the BMLA, Mike is the Laser Guru.

Lisa's claim to laser fame is being Mike's daughter. Growing up with lasers and never avoiding a physics lesson from her Dad, it was natural to enter the industry. Leaving a corporate career with a baby to jump into self employed life came with challenges. Despite that Lisa has been well recognised for her teaching style, practical tips, bringing the compassion to the science, and laser mentoring.

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https://mikemurphyblog.com

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