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ALD LASER TEST – ACTUAL 2025/2026
EXAM WITH COMPLETE QUESTIONS
WITH 100% CORRECT ANSWERS.
VERIFIED/GRADED A+
Who theorized the concept of stimulated emission? - (ANSWER)Einstein
Who theorized that an excited electron will spontaneously return to its ground
state? - (ANSWER)Bohr
The first ruby laser was created in _____ by ______. - (ANSWER)1960, Ted
Maiman
Who reported in 1965 that a ruby laser could vaporize enamel? - (ANSWER)Stern
and Sognnaes
First pulsed Nd:YAG laser released in year______ and cuts ______ tissue. -
(ANSWER)1990, soft tissue
In year _____ 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
, 2
The word LASER is an acronym standing for _________. - (ANSWER)Light
Amplification by Stimulated Emission of Radiation
Laser parameters include what 3 things? - (ANSWER)1)Duration of exposure
2)Fiber Diameter
3)Wavelength
Lasers are:
______chromatic?
_____directional?
coherent or noncoherent?
emitted from a stimulated ____________. - (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? - (ANSWER)solid, gas, semiconductor
What type of active medium is used in Er: YAG? - (ANSWER)solid state using
crystal matrix (erbium laced yttrium, aluminum and garnet)
, 3
What type of gas is used when the active medium is sealed in an air tight
chamber? - (ANSWER)CO2 (carbon dioxide)
Diode lasers have what type of active medium? - (ANSWER)semiconductor
what photons form the laser? - (ANSWER)light that leaks from the output coupler
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.
Amplification - (ANSWER)Released photons can go on to stimulate more atoms in
the crystal, thus producing more photons
Energy density depends on what 3 things? - (ANSWER)energy, divergence
(tendency of a laser beam to spread outward=laser beam diameter increases),
and distance
Energy is measured in ______ - (ANSWER)Joules (millijoules)
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)
Frequency is measured in _____. - (ANSWER)Hertz ( laser pulses/sec)
ALD LASER TEST – ACTUAL 2025/2026
EXAM WITH COMPLETE QUESTIONS
WITH 100% CORRECT ANSWERS.
VERIFIED/GRADED A+
Who theorized the concept of stimulated emission? - (ANSWER)Einstein
Who theorized that an excited electron will spontaneously return to its ground
state? - (ANSWER)Bohr
The first ruby laser was created in _____ by ______. - (ANSWER)1960, Ted
Maiman
Who reported in 1965 that a ruby laser could vaporize enamel? - (ANSWER)Stern
and Sognnaes
First pulsed Nd:YAG laser released in year______ and cuts ______ tissue. -
(ANSWER)1990, soft tissue
In year _____ 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
, 2
The word LASER is an acronym standing for _________. - (ANSWER)Light
Amplification by Stimulated Emission of Radiation
Laser parameters include what 3 things? - (ANSWER)1)Duration of exposure
2)Fiber Diameter
3)Wavelength
Lasers are:
______chromatic?
_____directional?
coherent or noncoherent?
emitted from a stimulated ____________. - (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? - (ANSWER)solid, gas, semiconductor
What type of active medium is used in Er: YAG? - (ANSWER)solid state using
crystal matrix (erbium laced yttrium, aluminum and garnet)
, 3
What type of gas is used when the active medium is sealed in an air tight
chamber? - (ANSWER)CO2 (carbon dioxide)
Diode lasers have what type of active medium? - (ANSWER)semiconductor
what photons form the laser? - (ANSWER)light that leaks from the output coupler
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.
Amplification - (ANSWER)Released photons can go on to stimulate more atoms in
the crystal, thus producing more photons
Energy density depends on what 3 things? - (ANSWER)energy, divergence
(tendency of a laser beam to spread outward=laser beam diameter increases),
and distance
Energy is measured in ______ - (ANSWER)Joules (millijoules)
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)
Frequency is measured in _____. - (ANSWER)Hertz ( laser pulses/sec)
