LASER BASICS
What does laser stand for?
Light Amplification by Stimulated Emission of Radiation
Which interaction gives results?
Absorption
What does monochromatic mean?
One wavelength / one color
Which setting controls the color of the laser?
Wavelength
What does TRT stand for?
Thermal Relaxation Time
What does nm measure?
Wavelength
What happens when light bounces off the skin?
Reflection
What does coherence mean?
Waves move together
Which setting controls the energy level?
Fluence
Which cools faster, skin or hair?
Skin
What is the main target in laser hair removal?
Melanin
What happens when light passes through with no effect?
Transmission
What does collimated mean?
Straight, focused beam
Which setting controls depth of penetration?
Spot size
Why do we use cooling?
Protect the skin
What does laser energy turn into in the skin?
Heat
What happens when light spreads out and loses energy?
Scatter
Which type of light has many wavelengths?
Polychromatic
Which setting controls time of heat delivery?
Pulse duration
What happens if skin absorbs too much energy?
Burns
What is the goal of laser hair removal?
Destroy the hair follicle without damaging skin
What law says light must be absorbed to have an effect?
Grothus Draper Law
Why is laser more precise than normal light?
It is monochromatic, coherent, and collimated
What is the rule for pulse duration?
Longer than skin TRT, shorter than hair TRT
What do we use for darker skin types?
Longer wavelength and longer pulse duration