LASERS CERTIFICATION EXAM QUESTIONS
AND ANSWERS
1.Theorized the concept of stimulated emission
Answer Einstein
2.Theorized that an excited electron will spontaneously return to its
ground state
Answer Bohr
3.First ruby laser was created in by .
Answer 1960, Ted Maiman
4. reported in 1965 that a ruby laser could vaporize enamel.
Answer Stern and Sognnaes
5.First pulsed Nd;YAG laser released in and cuts tissue.
Answer 1990, soft tissue
6.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
1/
26
,YSGG
7.The word LASER is an acronym standing for .
Answer Light Amplification by Stimulated Emission of Radiation
8.Laser parameters include what 3 things?
Answer 1)Duration of exposure
2)Fiber Diameter
3)Wavelength
9.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
10.What states can the active medium be in?
Answer solid, gas, semiconductor
11.What type of active medium is used in Er; YAG?
2/
26
, Answer solid state using crystal matrix (erbium laced yttrium,
aluminum and garnet)
12.What type of gas is used when the active medium is sealed in an air tight
chamber?
Answer CO2
13.Diode lasers have what type of active medium?
Answer semiconductor
14.what photons form the laser?
Answer light that leaks from the output coupler
15.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.
16.Amplification
Answer Released photons can go on to stimulate more atoms in the
crystal, thus producing more photons
17.Energy density depends on what 3 things?
Answer energy, divergence (tendency of a laser beam to spread
3/
26
AND ANSWERS
1.Theorized the concept of stimulated emission
Answer Einstein
2.Theorized that an excited electron will spontaneously return to its
ground state
Answer Bohr
3.First ruby laser was created in by .
Answer 1960, Ted Maiman
4. reported in 1965 that a ruby laser could vaporize enamel.
Answer Stern and Sognnaes
5.First pulsed Nd;YAG laser released in and cuts tissue.
Answer 1990, soft tissue
6.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
1/
26
,YSGG
7.The word LASER is an acronym standing for .
Answer Light Amplification by Stimulated Emission of Radiation
8.Laser parameters include what 3 things?
Answer 1)Duration of exposure
2)Fiber Diameter
3)Wavelength
9.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
10.What states can the active medium be in?
Answer solid, gas, semiconductor
11.What type of active medium is used in Er; YAG?
2/
26
, Answer solid state using crystal matrix (erbium laced yttrium,
aluminum and garnet)
12.What type of gas is used when the active medium is sealed in an air tight
chamber?
Answer CO2
13.Diode lasers have what type of active medium?
Answer semiconductor
14.what photons form the laser?
Answer light that leaks from the output coupler
15.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.
16.Amplification
Answer Released photons can go on to stimulate more atoms in the
crystal, thus producing more photons
17.Energy density depends on what 3 things?
Answer energy, divergence (tendency of a laser beam to spread
3/
26
