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LA-201

Laser and Light Based Hair Removal Physics

QuestionAnswer
What are the three characteristics of LASER light? 1.) Monochromatic 2.) Collimated 3.) Coherent
is LASER light considered to be polychromatic? No
Light that has one wavelength or one color is called what kind of light? Monochromatic
Light waves that are all in phase and unison with each other and traveling in the same directions is called what kind of light? Coherent
Light waves that all run parallel to each other is called what kind of light? Collimated
Light that has multiple wavelengths or colors that create a broad spectrum of light is called what kind of light? Polychromatic
What type of melanin is responsible for brown/black pigment? Eumelanin
What type of melanin is responsible for blonde/red-pink pigment? Pheomelanin
What are the two types of melanin? 1.) Eumelanin 2.) Pheomelanin
What do you call the use of laser energy to selectively destroy a target beneath the skin? Photo-thermolysis
Between spot sizes 5 mm and 18 mm, which one will have the deepest penetration? 18 mm
Larger spot sizes have _____ penetration compared to smaller spot sizes. Deeper/more
What is the target chromophore for laser hair removal? Melanin
What are the three stages, in correct order, that an electron will go through to produce a photon? 1.) Ground 2.) Singlet 3.) Metastable
When an electron releases one or more photons, it is in which stage of lasing? Metastable
In which stage are you lasing? Metastable
When an atom releases energy in the form a photon it is called ______ ______. Spontaneous emission
What phenomenon must occur before a laser can fire? Spontaneous emission
When electrons are in an excited state, what stage of lasing are they in? Singlet
When electrons are in a resting state, what stage of lasing are they in? Ground/stable
What kind of radiation causes changes in DNA and can lead to cellular mutation or death? Ionizing radiation
What kind of radiation does not cause changes in DNA? Non-ionizing radiation
What kind of radiation is LASER? Non-ionizing radiation
What is the wavelength for the Nd:Yag? 1064 nm
What do you call the distance measure between two peaks or high points of a wave? Wavelength
What is the acronym for LASER? Light Amplification by Stimulated Emission of Radiation
What is the most important variable to take into consideration in regards to the thermal relaxation time of the skin? Pulse duration
Are IPL machines considered to be true lasers? No
What are the three characteristics of IPL light? 1.) Polychromatic (broad spectrum of light) 2.) Non-collimated 3.) Non-coherent
What do you call the bending of light? refraction
After the chromophore has absorbed the laser light and turned it into heat, where does the heat transfer to? Adjacent tissue
Longer wavelengths will have _____ penetration into the skin compared to shorter wavelengths. Deeper/more
What does IPL stand for? Intense Pulsed Light
What is the wavelength for the Alexandrite laser? 755 nm
What do you call the measurement of energy density which is expressed in joules per cm 2? Fluence
What do you call the material or substance that is used inside the laser to emit a specific wavelength of light? Medium
What do you call the object that absorbs the light in laser treatments? Chromophore
What is the wavelength for the Ruby laser? 694.3 nm
Which electrology modality is laser hair removal most often compared to? Flash thermolysis
What is the average spot size range for laser hair removal? 3-18 mm
Which two types of measurements are used to measure the pulse width of a laser machine? 1.) ms (milliseconds) 2.) ns (nanoseconds)
What is the wavelength range for IPL machines? 400 nm- 1400 nm
Light will be transmitted, reflected or scattered if it is not _____ by an object. Absorbed
The pulse width should be _____ or equal to the TRT of the target chromophore. Shorter
The pulse width should be _____ than the TRT of the skin. Longer
Why should the pulse width be shorter or equal to the TRT of the target chromophore? So that the total amount of heat is applied to the chromophore before it has a change to cool down. (overwhelming the chromophore)
Why should the pulse width be longer that the TRT of the skin? To give time to the skin to cool down. By the time the total amount of heat is applied to the skin, the skin has already started to cool down and won't be overwhelmed
What is the wavelength for the Diode laser? 810 nm
What is the range of light for the visible light spectrum 400 nm-700 nm
What is the most common type of laser used? Pulsed laser
What is a pulsed laser? A laser that delivers the light in pulses instead of one long continuous light wave.
In laser, what determines which chromophore you will be targeting? Wavelength
What do you call the device that is used to compensate for the polychromatic light that is produced by IPL machines? Filter
What do you call the amount of time it takers for a structure to cool to half of the temperature that it was heated to? Thermal Relaxation Time (TRT)
Between short and long wavelengths, which one will have a stronger affinity for melanin? Shorter wavelengths
Between short and long wavelengths, which one will have more dermal scatter? Shorter wavelengths
Shorter wavelengths will have _____ penetration in the skin compared to longer wavelengths Less
What measurement is used to measure wavelengths? Nanometers (nm)
When light bounces off an object it is called ______. Reflection
According to the Grotthus-Draper law, if there is no absorption of light, then there is ____________________. No effect on tissue
The amount of time that light energy is applied to a target chromophore is called ______ ______ Pulse width/duration
Between spot sizes 5 mm and 18 mm, which one will have the least amount of dermal scatter? 18 mm
What do you call tiny particles of light? Photons
Created by: ElectricEsti