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Worksheetslaser in Periodontics
Total questions: 15
Worksheet time: 8mins
High optical gain in LASER diode is due to
Heavily doped P-layer
Heavily doped N-layer
Active layer
Reflective surfaces
The atoms _______ energy to raise from a lower energy level to upper energy level
release
absorbs
produce
none of the above
What are three types of Laser?
gas,solid,diode
diode,inverted,pointer
gas,metal vapor,rock
pointer,diode,CD
What is the process responsible for producing photons in diode laser?
Fermi level shift
Majority carrier injection
Carrier freeze out
Electron-hole recombination
Which of the following property is a property of laser?
Directional
Monochromatic
Coherence
Divergent
Population inversion means
Number of atoms in excited state are equal to the number of atoms in the ground state.
Number of atoms in excited state are more than the number of atoms in the ground state.
Number of atoms in excited state are less than the number of atoms in the ground state.
No atom in excited state.
The first laser was built in...
1920
1940
1960
1980
Pump system needs to raise the atoms from...
exited state to ground state
ground state to exited state
ground state to unexcited state
excited state to exited state
Laser is a monochromatic source of light. This means all the light waves have...
same wavelength
same phase
same intensity
same direction
Laser is a coherent source of light. This means all the light waves....
are out of phase
are in phase
have different directions
have same direction
Light amplification in LASER is achieved by
Population inversion
Stimulated emission
Spontaneous emission
Pumping
Naturally occuring process in a LASER is
Stimulated Emission
Absorption
Spontaneous Emission
Population Inversion
Which of the following statements are true?
- LASER is used as optical source in single mode fibers.
- LASER lights are highly incoherent.
1. is true and 2. is false
1. is false and 2. is true
Both 1 & 2 are true
Both 1 & 2 are false
Acronym for LASER is
Light Absorption by Stimulated Emission of Radiation
Light Amplification by Stimulated Emission of Radiation
Light Alteration by Stimulated Emission of Radiation
Light Attenuation by Stimulated Emission of Radiation
