Laser and Light-Based Hair Removal Physics
Exam With 100% Correct Answers 2024
What is the acronym for LASER?
Light Amplification by Stimulated Emission of Radiation
Photothermolysis is based on the principle of using:
Laser energy to selectively destroy a target beneath the surface of the skin
The measure of energy density delivered to the tissue expressed in joules per
cm2 is called?
Fluence
The principle of selective photothermolysis relies on the presence of what
substance in the follicle and surrounding structure?
Melanin
Laser pulse width represents the:
Amount of time the target is exposed to the laser
In laser hair removal the most important consideration associated with spot size
is the:
Depth of penetration of the energy into the dermis
The amount of time it takes a substance after heating to return to its normal
temperature is known as:
Thermal relaxation time
When excited with a flashlamp the ehe alexandrite crystal emits radiation at:
755nm
Select the response with all the correct properties of laser light as it reacts with
tissue.
-Reflection
-Absorption
-Transmission
-Sccatter
Longer laser wavelengths:
Penetrate more
Permanent hair reduction according to the FDA is defined as?
A long term stable reduction in the number of hairs regrowing after a treatment regime
In laser hair removal, what need to be damaged in order to prevent further hair
growth?
Stem cells and dermal papilla
Select the wavelength for a long pulsed Ruby laser.
694nm
Light waves that travel in perfect unison, parallel, and in the same direction are
known as?
Coherent light
What type of non-laser light is also used for hair removal?
Intense pulse light
Laser light cannot:
Cause intercellular changes in DNA
Exam With 100% Correct Answers 2024
What is the acronym for LASER?
Light Amplification by Stimulated Emission of Radiation
Photothermolysis is based on the principle of using:
Laser energy to selectively destroy a target beneath the surface of the skin
The measure of energy density delivered to the tissue expressed in joules per
cm2 is called?
Fluence
The principle of selective photothermolysis relies on the presence of what
substance in the follicle and surrounding structure?
Melanin
Laser pulse width represents the:
Amount of time the target is exposed to the laser
In laser hair removal the most important consideration associated with spot size
is the:
Depth of penetration of the energy into the dermis
The amount of time it takes a substance after heating to return to its normal
temperature is known as:
Thermal relaxation time
When excited with a flashlamp the ehe alexandrite crystal emits radiation at:
755nm
Select the response with all the correct properties of laser light as it reacts with
tissue.
-Reflection
-Absorption
-Transmission
-Sccatter
Longer laser wavelengths:
Penetrate more
Permanent hair reduction according to the FDA is defined as?
A long term stable reduction in the number of hairs regrowing after a treatment regime
In laser hair removal, what need to be damaged in order to prevent further hair
growth?
Stem cells and dermal papilla
Select the wavelength for a long pulsed Ruby laser.
694nm
Light waves that travel in perfect unison, parallel, and in the same direction are
known as?
Coherent light
What type of non-laser light is also used for hair removal?
Intense pulse light
Laser light cannot:
Cause intercellular changes in DNA
