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Lasers in Skin

Lasers in Skin

Auteur(s): Lisa McMahon & Mike Murphy
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 Lasers in Skin Podcast, hosted by "Laser Guru" Mike Murphy, and his daughter Lisa McMahon, dives into the science of lasers in aesthetics. Mike and Lisa delve into the fundamental physics all laser technicians must understand to get the best results, while squashing the myths, the "marketing baloney" and calling out poor training in the industry. Along with unmissable interviews and 'ask us anything' episodes, the Lasers in Skin Podcast is the ultimate podcast for laser geeks! Art Hygiène et mode de vie sain Science
Épisodes
  • ELI5 - How Are Spot Size, Fluence & Penetration Depth Related?

    ELI5 - How Are Spot Size, Fluence & Penetration Depth Related?
    Nov 13 2025
    In today's episode, Lisa and Mike turn up the energy - literally! They dive into the fascinating world of lasers and IPL treatments, unpacking the science behind spot size, fluence, depth of penetration, and wavelengths. When Emma, a curious Level 4 student, asks about how energy delivery changes with different spot sizes, Lisa and Mike fire back with laughs, analogies, and plenty of light-based wisdom. Along the way, they break down why fluence matters, how scattering shapes results, and why pre-cooling can be the secret to a pain-free zap. KEY TAKEAWAYS Fluence, defined as energy per area (joules per square centimetre), remains constant across different spot sizes. However, the total energy delivered varies significantly based on the spot size, with larger spots delivering more total energy. When light enters the skin, it scatters, which affects the fluence at different depths. The scattering can lead to an increase in fluence just below the skin surface due to backscattering, which can exceed the incident fluence. Different wavelengths penetrate the skin differently, with red light penetrating deeper than blue or green light. However, the presence of scattering in the skin can alter the effectiveness of these wavelengths. Increasing fluence at the skin surface raises the temperature in the epidermis, which can trigger pain receptors. Pre-cooling the skin before treatment can help mitigate pain by lowering the baseline temperature. Understanding fluence is crucial for effective laser treatments, as it directly influences the temperature rise in the target tissue, which is essential for achieving desired treatment outcomes. BEST MOMENTS "When you set up your laser or IPL to deliver a particular fluence, then at every point in that spot the fluence is the same, or it should be the same." "So then how does the small spot work so well? Because it's the fluence that's important, not the total energy." "The fluence is what drives the process. Fluence is directly responsible for the temperature increase in whatever the target is." "Isn't it cool though what happens in your skin when you shoot a laser in there? Or a light, not just lasers." "If you pre-cool the skin before you fire in your light energy, there's a smaller chance of triggering the pain receptors." 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. Instagram: @dermalase_lasertraining https://mikemurphyblog.com https://www.dermalasetraining.com This Podcast has been brought to you by Disruptive Media. https://disruptivemedia.co.uk/
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    37 min
  • Ask the Physicist Fun Questions!

    Ask the Physicist Fun Questions!
    Nov 6 2025
    In a fascinating deviation from their usual topic, Lisa and Mike delve deep into the world of experimental physics and astrophysics in this episode. Mike tackles a range of mind-bending questions sourced by Lisa from ChatGPT, covering everything from the common misconceptions of relativity and time dilation near the speed of light and black holes, to the immense size of the universe. They also touches on space exploration (Mars colonisation), the mysteries of gravity (gravitational waves), and some truly silly, thought-provoking physics questions about cats, superheroes, and woodchucks. KEY TAKEAWAYS Time does not actually "slow down" for an object approaching the speed of light; it appears to slow down to an external observer due to relative motion and frames of reference. To an external observer, an object (like a spaceship) approaching a black hole would appear to slow down and freeze permanently at the event horizon, never crossing it. However, the person inside the spaceship would simply pass through without noticing the horizon. The universe is "unfathomable" in size, beyond human comprehension. The current estimate for its total lifespan is potentially less than 50 billion years, which is considered a relatively short time in cosmic terms. Gravitational waves, tiny ripples in spacetime caused by massive collisions (like black holes), were eventually measured using extremely precise laser interferometry technology. String theory, the idea that everything is made of vibrating strings of energy, is currently unprovable because we lack the technology to observe or measure these incredibly small units. BEST MOMENTS "This is a common misconception out there. Relativity, it's all about relative motion from one person to another person or whatever." “To me, I can just seal straight on through the black hole's event horizon. I don't see anything, I don't notice that. I'm not even aware that the event horizon is there." “The way I think about time in general is like a river. To quote the great Doctor Who, it's a ‘wibbly-wobbly thing'." "We're small creatures living on a small rock in a small part of this smallish galaxy, and it feels so big." "Gravity is always attractive. Gravity pulls things towards each other. There's no such thing as a negative gravity or repelling." 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. Instagram: @dermalase_lasertraining https://mikemurphyblog.com https://www.dermalasetraining.com This Podcast has been brought to you by Disruptive Media. https://disruptivemedia.co.uk/
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    41 min
  • Are Laser Techs 'Robbing Everyone'?

    Are Laser Techs 'Robbing Everyone'?
    Oct 30 2025
    In this episode, Lisa and Mike dive into a recent controversy sparked by an influencer's comments about laser hair removal and pregnancy. Lisa shares her frustration over misinformation that has caused panic among clients considering laser treatments while planning for pregnancy. They explore the science behind hair growth cycles, the effects of hormonal changes during pregnancy, and the importance of understanding how laser treatments work. Mike provides insights into the physiological aspects of hair follicles and the potential for dormant follicles to reactivate, emphasising that reputable clinics are not "robbing" clients. KEY TAKEAWAYS An influencer's comments about laser hair removal and pregnancy have caused panic among clients, leading to misconceptions about the effectiveness of treatments. Hair growth can appear synchronized after laser treatments, making it seem like hair is regrowing when, in fact, dormant follicles may be activated due to hormonal changes or other factors. Once a hair follicle is effectively destroyed through proper laser treatment, it cannot regenerate. However, if a follicle is only stunned, it may regrow. Pregnancy can lead to hormonal shifts that may stimulate dormant hair follicles, resulting in increased hair growth in some areas, regardless of previous laser treatments. It's essential for laser clinics to communicate effectively with clients about the realities of hair removal and the potential for hormonal influences, ensuring that misinformation does not lead to unnecessary concerns. BEST MOMENTS "I wanted to put my two cents out there and explain as a laser trainer, laser tech, and a pregnant lady. I’m pretty qualified to talk about this." "When you kill a hair follicle, it's deed. You cannot grow new follicles. That's impossible." "It's not new follicles. Laser clinics are not robbing you. This can happen to anybody at any time." "You could end up seeing potentially more hair or what appears to be more hair than you had previously." "What Sophie has been saying has been miscommunication. It’s misinformed." 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. Instagram: @dermalase_lasertraining https://mikemurphyblog.com https://www.dermalasetraining.com This Podcast has been brought to you by Disruptive Media. https://disruptivemedia.co.uk/
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    21 min
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