Laser Hair Removal Test (in class exam)
2025/2026 Exam All Answers and
Illustrations Given
What is the definition of the acronym LASER? - 🧠ANSWER ✔✔Light
Amplification by Stimulated Emission of Radiation
Name the specific wavelengths for laser hair removal. - 🧠ANSWER
✔✔Ruby- 694 nm
Alex- 755 nm
Diode-800-810 nm
NDYAG- 1064 nm
What determines the depth of penetration? - 🧠ANSWER ✔✔Dependent on
wavelength & spot size (width of laser beam)
What are the four basic parameters of laser? - 🧠ANSWER ✔✔wavelength,
pulse width, spot size, fluence
1
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, How is wavelength measured? - 🧠ANSWER ✔✔by the distance between
two peaks and measured in nanometers (nm)
(from peak to peak or trough to trough)
What percentage does TRT (Thermal Relaxation Time) have to
accomplish? - 🧠ANSWER ✔✔50% (time necessary for a target tissue to
cool down by 50% through transfer of heat to surrounding tissue via
thermal diffusion)
What are the 4 types of epidermal cooling used? - 🧠ANSWER ✔✔contact
cooling(most efficient), cryogen spray (applied before and/or after), air
cooling (-34° C) , Gel (clear)
What is the concept (Theory) of Selective Photothermolysis? - 🧠ANSWER
✔✔Selective destruction of the target without thermal injury to the
surrounding tissue.
Eye protection is needed for which which classification of lasers? -
🧠ANSWER ✔✔class 3B & Class 4
What is the OPTIMAL optical density rating? - 🧠ANSWER ✔✔7 (the range
is 4.5-7...7 being the optimal)
2
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2025/2026 Exam All Answers and
Illustrations Given
What is the definition of the acronym LASER? - 🧠ANSWER ✔✔Light
Amplification by Stimulated Emission of Radiation
Name the specific wavelengths for laser hair removal. - 🧠ANSWER
✔✔Ruby- 694 nm
Alex- 755 nm
Diode-800-810 nm
NDYAG- 1064 nm
What determines the depth of penetration? - 🧠ANSWER ✔✔Dependent on
wavelength & spot size (width of laser beam)
What are the four basic parameters of laser? - 🧠ANSWER ✔✔wavelength,
pulse width, spot size, fluence
1
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, How is wavelength measured? - 🧠ANSWER ✔✔by the distance between
two peaks and measured in nanometers (nm)
(from peak to peak or trough to trough)
What percentage does TRT (Thermal Relaxation Time) have to
accomplish? - 🧠ANSWER ✔✔50% (time necessary for a target tissue to
cool down by 50% through transfer of heat to surrounding tissue via
thermal diffusion)
What are the 4 types of epidermal cooling used? - 🧠ANSWER ✔✔contact
cooling(most efficient), cryogen spray (applied before and/or after), air
cooling (-34° C) , Gel (clear)
What is the concept (Theory) of Selective Photothermolysis? - 🧠ANSWER
✔✔Selective destruction of the target without thermal injury to the
surrounding tissue.
Eye protection is needed for which which classification of lasers? -
🧠ANSWER ✔✔class 3B & Class 4
What is the OPTIMAL optical density rating? - 🧠ANSWER ✔✔7 (the range
is 4.5-7...7 being the optimal)
2
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
