Exam Bank Questions with Answers for lasers and optical fibres Rated 100%
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Course
Fibre optic
Institution
Fibre Optic
Exam Bank Questions with Answers for lasers and optical fibres Rated 100%
laser - Answers light amplification by stimulated emission of radiation, it is an opto-electronic device
photon energy - Answers the energy difference between two states(ground and excited) which the electron has to absorb...
Exam Bank Questions with Answers for lasers and optical fibres Rated 100%
laser - Answers light amplification by stimulated emission of radiation, it is an opto-electronic device
photon energy - Answers the energy difference between two states(ground and excited) which the
electron has to absorb in the form of a photon in order to jump to the excited state
right energy - Answers the required amount of energy for an electron with corresponding frequency to
move to an excited state
induced absorption - Answers an atom absorbs all the incident photon energy and jumps to the excited
state
spontaneous emission - Answers atom returns to a lower energy state with emission of photon energy
stimulated emission - Answers an atom in an excited state is stimulated to fall to a lower energy state
and emit photon energy in a time much less that its mean spontaneous decay time (this interaction is
responsible for the generation of a laser beam)
population inversion - Answers a necessary condition for laser operation; occurs when more atoms
within a system occupy a higher energy state than those that occupy a lower energy state (achieved
through pumping)
pumping - Answers process by which the active species of a laser is excited by means of an electrical
discharge, passage of an electric current or exposure to an intense radiant source
meta-stable state - Answers lower excited energy state in which the atom stays for considerably longer
than the excited state
active medium - Answers a medium in which light gets amplified
active centres - Answers the small fraction of atoms in an active medium that are responsible for light
amplification
normal state of energy - Answers the state at which the lower energy state is more populated than the
excited state
optical fibre - Answers very thin (5-50microm thick), flexible and are made up of silicon glass; carry large
volume of data with negligible loss over long distances
acceptance angle - Answers the maximum angle a light ray can have with respect to the axis of the fibre
and propagate through it
numerical aperture/meridonial acceptance angle - Answers measure of the light gathering power of a
fibre
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