Answers
Laser stands for what? - -Light What type of wave is used in laser hair removal? - -
Amplification by Pulsed wave
Stimulated
Emission of
Radiation A chromophore is also know at what? - -Target
What is the distance measured in nanometers between The chromophore absorbs what? - -Energy
two peaks or two troughs known as? - -Wavelength
Goggles worn by the patient and practitioner must be
Light of only one color & one specific wavelength is known approved by which group? - -ANSI (American
as? - -Monochromatic National Standard Institute) for Class 3B and Class 4
Lasers
Refraction is also known as what? - -Transmission
Each laser wavelength is what to its machine? - -
Specific
The process where by a newly created photon of light
(generated through amplification) acquires energy equal
to the photons that created it is known as? - - What are the parameters when doing laser hair removal? -
Stimulated Emission -Wavelength
Spot Size
Fluence
The states of equilibrium or middle state of light - - Pulse Width
Metastable State
Pulsed lasers allow for selective heating of specific
Who theorized stimulated emission? - -Albert targets, this is also known as? - -Selective
Einstein Photothermolysis
The part of the laser that contains the active medium is The rate/amount of energy delivered within a given area is
called? - -Resinator cavity known as? - -Fluence
What are the states of light in stimulated emission? - An increase in fluence equals an increase in what? -
-Ground State -Heat. Resulting in more damage
Excited State
Singlet State
Metastable State The length of time the light/energy is in contact with the
target that is measured in milliseconds (ms): - -
Pulse width/Pulse duration
Alexandrite laer is in the visible light spectrum at what
wavelength? - -755 nm
If the time of pulse duration is changed from milliseconds
to nanoseconds the laser is what? - -Q Switched
The Nd:YAG laser falls in the invisible light spectrum with
a wavelength of what? - -1064 nm
A Q switched laser is used for what? - -Tattoo
removal
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Answers
What does the FDA call laser hair removal? - -
Which skin types can tolerate an Alex laser? - -1-4 Permanent hair reduction
Which skin types can tolerate a Nd:YAG laser? - - What is the highest setting the skin can tolerate without
All skin types damage called? - -Fluence Threshold
Which skin type should only have electrolysis and no What is the highest setting the patient can tolerate without
laser? - -Type 1 the treatment becoming impossible called? - -
Patient Threshold
If the pulse width is greater than the thermal relaxation
time it results in? - -A burn The amount of hair per one square centimeter is known
as? - -Hair density
If the pulse width is less than or equal to the thermal
relaxation time it results in? - -Perfect hair removal The higher the hair density, the _______ the fluence? -
-Lower
Larger structures have __________ thermal relaxation
times (TRT) - -Longer What percentage of overlapping do you want when doing
LHR? - -30%
Smaller structures have _______ thermal relaxation times
(TRT) - -Shorter Darker/tanned skin requires what kind of fluence? - -
Lower
What kind of pulse widths protect the epidermis, penetrate
deeper and cool more slowly? - -Long What should you never use to clean a patient's skin prior
to LHR? - -Alcohol
Longer pulse widths are for what skin type? - -4-6
Pulse duration is measured in what unit? - -
milliseconds (ms)
What kind of pulse widths are more aggressive and heat
up and cool down quickly? - -Short
Spot size is measured in what unit? - -millimeters
(mm)
Shorter pulse widths are for what skin type? - -1-3
Repetition rate is measured in what unit? - -hertz
What percentage of follicles are damaged with each laser (Hz)
treatment? - -15%
Who is the grandfather of laser and was the first person to
What is a long-term stable reduction of the growing hairs use water to cool the skin during laser? - -Rox
after a treatment regime? - -Laser Hair Removal Anderson
(LHR)
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The formula for fluence is? - -Joules = J/cm2 as? - -Erythema
What kind of lasers allow for selective heating of specific An over treatment of the skin characterized by blistering or
targets? - -Selective photothermolysis epidermal separation, caused by lateral pressure on the
skin is known as? - -Nikolski Sign
For deeper laser penetration what should the practitioner
do to the laser? - -Change to a bigger spot size When tissue has been injured, fluid escapes the blood
vessels to surround the damaged tissue. This is referred
to as? - -Edema
The primary reason for using cooling devices during laser
hair removal is? - -Allows for higher and more
effective fluences to be used while sparing the epidermis The common type of laser used for hair removal is? -
-Pulsed
During the initial consultation, the patient should be
informed that the process will take how long for laser hair Total destruction of tissue using laser energy is known as?
removal? - -A series of treatments - -photoablation
The principle that says energy must be absorbed by an Laser is ineffective on hair that has? - -Little to no
object in order to produce an effect is called? - - pigment
Grotthuss-Draper law
The energy level of a laser, measured in joules is known
What is laser light? - -Monochromatic light as? - -Energy fluence
Laser is equivalent to which of the following modalities? - Lightwaves that travel in perfect unison, parallel and in the
-Thermolysis same direction are known as? - -Coherent light
An element has the ability to produce laser when it is in Optical density labeling on laser safety eyewear refers to?
which state? - -Metastable state - -the degree to which a refractive medium retards
transmitted rays of light
What are the positive reactions to the skin indicating a
successful LHR treatment? - -Perifollicular An allergic phototoxic reaction can occur up to how many
erythema, perifollicular edema hours post-treatment? - -24
Incandescent light is an example of? - -Incoherent Which part of the body is most vulnerable to laser light? -
light -Eyes (cornea, retina, and lens)
A requirement for foot switches that directly pulse the What is used to cool the inside of most pulsed lasers
laser is that they be? - -Hooded during operation? - -Distilled water
The effect of skin turning red after treatment is referred to What is the chromophore when using the Nd:YAG laser