LASERS CERTIFICATION EXAM 2026
Questions and Answers
Theorized the concept of stimulated emission - Correct answer-Einstein
Theorized that an excited electron will spontaneously return to its ground state -
Correct answer-Bohr
First ruby laser was created in _____ by ______. - Correct answer-1960, Ted
Maiman
_________ reported in 1965 that a ruby laser could vaporize enamel. - Correct
answer-Stern and Sognnaes
First pulsed Nd:YAG laser released in ______ and cuts ______ tissue. - Correct
answer-1990, soft tissue
In _____ the first dental hard tissue was FDA cleared and is called _______. And
the ______ laser a year later. - Correct answer-1997
Er: YAG laser
Er, Cr: YSGG
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,The word LASER is an acronym standing for _________. - Correct answer-Light
Amplification by Stimulated Emission of Radiation
Laser parameters include what 3 things? - Correct answer-1)Duration of exposure
2)Fiber Diameter
3)Wavelength
Lasers are:
______chromatic?
_____directional?
coherent or noncoherent?
emitted from a stimulated ____________. - Correct answer-monochromatic: made
of a single wavelength (visible or infrared)
unidirectional
coherent (all peaks and valleys of each wave travel in unison)
active medium
What states can the active medium be in? - Correct answer-solid, gas,
semiconductor
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, What type of active medium is used in Er: YAG? - Correct answer-solid state using
crystal matrix (erbium laced yttrium, aluminum and garnet)
What type of gas is used when the active medium is sealed in an air tight chamber?
- Correct answer-CO2
Diode lasers have what type of active medium? - Correct answer-semiconductor
what photons form the laser? - Correct answer-light that leaks from the output
coupler
Stimulated emission: - Correct answer-atoms of the active medium are stimulated
to a higher energy level--> released as a photon as the atom returns to a more stable
lower energy level.
Amplification - Correct answer-Released photons can go on to stimulate more
atoms in the crystal, thus producing more photons
Energy density depends on what 3 things? - Correct answer-energy, divergence
(tendency of a laser beam to spread outward=laser beam diameter increases), and
distance
Energy is measured in ______ - Correct answer-Joules (millijoules)
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Questions and Answers
Theorized the concept of stimulated emission - Correct answer-Einstein
Theorized that an excited electron will spontaneously return to its ground state -
Correct answer-Bohr
First ruby laser was created in _____ by ______. - Correct answer-1960, Ted
Maiman
_________ reported in 1965 that a ruby laser could vaporize enamel. - Correct
answer-Stern and Sognnaes
First pulsed Nd:YAG laser released in ______ and cuts ______ tissue. - Correct
answer-1990, soft tissue
In _____ the first dental hard tissue was FDA cleared and is called _______. And
the ______ laser a year later. - Correct answer-1997
Er: YAG laser
Er, Cr: YSGG
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,The word LASER is an acronym standing for _________. - Correct answer-Light
Amplification by Stimulated Emission of Radiation
Laser parameters include what 3 things? - Correct answer-1)Duration of exposure
2)Fiber Diameter
3)Wavelength
Lasers are:
______chromatic?
_____directional?
coherent or noncoherent?
emitted from a stimulated ____________. - Correct answer-monochromatic: made
of a single wavelength (visible or infrared)
unidirectional
coherent (all peaks and valleys of each wave travel in unison)
active medium
What states can the active medium be in? - Correct answer-solid, gas,
semiconductor
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, What type of active medium is used in Er: YAG? - Correct answer-solid state using
crystal matrix (erbium laced yttrium, aluminum and garnet)
What type of gas is used when the active medium is sealed in an air tight chamber?
- Correct answer-CO2
Diode lasers have what type of active medium? - Correct answer-semiconductor
what photons form the laser? - Correct answer-light that leaks from the output
coupler
Stimulated emission: - Correct answer-atoms of the active medium are stimulated
to a higher energy level--> released as a photon as the atom returns to a more stable
lower energy level.
Amplification - Correct answer-Released photons can go on to stimulate more
atoms in the crystal, thus producing more photons
Energy density depends on what 3 things? - Correct answer-energy, divergence
(tendency of a laser beam to spread outward=laser beam diameter increases), and
distance
Energy is measured in ______ - Correct answer-Joules (millijoules)
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
