Page 1 of 36
LASERS CERTIFICATION EXAM ACTUAL EXAM ALL
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR
QUESTION: The word LASER is an acronym standing for _________. - ANSWER-Light
Amplification by Stimulated Emission of Radiation
QUESTION: Laser parameters include what 3 things? - ANSWER-1)Duration of exposure
2)Fiber Diameter
3)Wavelength
QUESTION: Lasers are:
______chromatic?
_____directional?
coherent or noncoherent?
emitted from a stimulated ____________. - ANSWER-monochromatic: made of a single
wavelength (visible or infrared)
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unidirectional
coherent (all peaks and valleys of each wave travel in unison)
active medium
QUESTION: What states can the active medium be in? - ANSWER-solid, gas, semiconductor
QUESTION: What type of active medium is used in Er: YAG? - ANSWER-solid state using crystal
matrix (erbium laced yttrium, aluminum and garnet)
Theorized the concept of stimulated emission - ANSWER-Einstein
QUESTION: Theorized that an excited electron will spontaneously return to its ground state -
ANSWER-Bohr
QUESTION: First ruby laser was created in _____ by ______. - ANSWER-1960, Ted Maiman
QUESTION: _________ reported in 1965 that a ruby laser could vaporize enamel. - ANSWER-
Stern and Sognnaes
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, Page 3 of 36
QUESTION: First pulsed Nd:YAG laser released in ______ and cuts ______ tissue. - ANSWER-
1990, soft tissue
QUESTION: In _____ the first dental hard tissue was FDA cleared and is called _______. And the
______ laser a year later. - ANSWER-1997
Er: YAG laser
Er, Cr: YSGG
QUESTION: What type of gas is used when the active medium is sealed in an air tight chamber?
- ANSWER-CO2
QUESTION: Diode lasers have what type of active medium? - ANSWER-semiconductor
QUESTION: what photons form the laser? - ANSWER-light that leaks from the output coupler
QUESTION: Stimulated emission: - 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.
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QUESTION: Amplification - ANSWER-Released photons can go on to stimulate more atoms in
the crystal, thus producing more photons
QUESTION: Energy density depends on what 3 things? - ANSWER-energy, divergence (tendency
of a laser beam to spread outward=laser beam diameter increases), and distance
QUESTION: Energy is measured in ______ - ANSWER-Joules (millijoules)
QUESTION: Power is ______ and is measured in _______ - ANSWER-rate of doing work, or
energy used over a period of time and is measured in Watts (J/sec)
QUESTION: Frequency is measured in _____. - ANSWER-Hertz ( laser pulses/sec)
QUESTION: What is the most important variable dictating how the laser beam will interact with
the target tissue? - ANSWER-Peak Power
QUESTION: Define Peak Power: - ANSWER-power level in each individual laser pulse, however it
is not visible to the operator
4
LASERS CERTIFICATION EXAM ACTUAL EXAM ALL
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR
QUESTION: The word LASER is an acronym standing for _________. - ANSWER-Light
Amplification by Stimulated Emission of Radiation
QUESTION: Laser parameters include what 3 things? - ANSWER-1)Duration of exposure
2)Fiber Diameter
3)Wavelength
QUESTION: Lasers are:
______chromatic?
_____directional?
coherent or noncoherent?
emitted from a stimulated ____________. - ANSWER-monochromatic: made of a single
wavelength (visible or infrared)
1
, Page 2 of 36
unidirectional
coherent (all peaks and valleys of each wave travel in unison)
active medium
QUESTION: What states can the active medium be in? - ANSWER-solid, gas, semiconductor
QUESTION: What type of active medium is used in Er: YAG? - ANSWER-solid state using crystal
matrix (erbium laced yttrium, aluminum and garnet)
Theorized the concept of stimulated emission - ANSWER-Einstein
QUESTION: Theorized that an excited electron will spontaneously return to its ground state -
ANSWER-Bohr
QUESTION: First ruby laser was created in _____ by ______. - ANSWER-1960, Ted Maiman
QUESTION: _________ reported in 1965 that a ruby laser could vaporize enamel. - ANSWER-
Stern and Sognnaes
2
, Page 3 of 36
QUESTION: First pulsed Nd:YAG laser released in ______ and cuts ______ tissue. - ANSWER-
1990, soft tissue
QUESTION: In _____ the first dental hard tissue was FDA cleared and is called _______. And the
______ laser a year later. - ANSWER-1997
Er: YAG laser
Er, Cr: YSGG
QUESTION: What type of gas is used when the active medium is sealed in an air tight chamber?
- ANSWER-CO2
QUESTION: Diode lasers have what type of active medium? - ANSWER-semiconductor
QUESTION: what photons form the laser? - ANSWER-light that leaks from the output coupler
QUESTION: Stimulated emission: - 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.
3
, Page 4 of 36
QUESTION: Amplification - ANSWER-Released photons can go on to stimulate more atoms in
the crystal, thus producing more photons
QUESTION: Energy density depends on what 3 things? - ANSWER-energy, divergence (tendency
of a laser beam to spread outward=laser beam diameter increases), and distance
QUESTION: Energy is measured in ______ - ANSWER-Joules (millijoules)
QUESTION: Power is ______ and is measured in _______ - ANSWER-rate of doing work, or
energy used over a period of time and is measured in Watts (J/sec)
QUESTION: Frequency is measured in _____. - ANSWER-Hertz ( laser pulses/sec)
QUESTION: What is the most important variable dictating how the laser beam will interact with
the target tissue? - ANSWER-Peak Power
QUESTION: Define Peak Power: - ANSWER-power level in each individual laser pulse, however it
is not visible to the operator
4
