Moja lekcja

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término definición
radiative recombination
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this energy is emitted in the form of a photon
non-radiative recombination
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it is passed on to one or more phonons and in the case of Auger recombination it is given off in the form of kinetic energy to another electron
Band-to-band recombination
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electron moves from its conduction band state into the empty valence band state associated with the hole
Trap-assisted recombination
an energy level within the bandgap caused by the presence of a foreignatom or a structural defect
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occurs when an electron falls into a "trap"
Auger recombination
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a process in which an electron and a hole recombine in a band-to band transition
population inversion
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When the number of particles in the excited state is greater than the number of particlesin the ground state the material is in a state of
LED
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The low energy part of the spectral
characteristics will be related to transitions between dopant levels and edge bands. The maximum of LED’s output power refers to the photon’s energy which is a little smaller
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characteristics will be related to transitions between dopant levels and edge bands. The maximum of LED's output power refers to the photon's energy which is a little smaller
than the width of the energy gap. The phenomenon of "fill-band" is
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than the width of the energy gap. The phenomenon of "fill-band" is
responsible for the high energy part of the spectral characteristics
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and it is caused by the
increasing of the current flowing through the diode.
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increasing of the current flowing through the diode.
The optical cavity
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contains a coherent beam of light
between reflective surfaces-mirrors so that the light passes through the gain medium more
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between reflective surfaces-mirrors so that the light passes through the gain medium more
than once before it is emitted from the output aperture or lost to diffraction or absorption
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than once before it is emitted from the output aperture or lost to diffraction or absorption
resonator
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in each passage through the active material the intensity gains
amplitude condition
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reached when the optical gain of the laser medium is exactly
balanced by the sum of all the losses experienced by light in one round trip of the laser's
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balanced by the sum of all the losses experienced by light in one round trip of the laser's
optical cavity.
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optical cavity.
phase condition
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obtained when the phase of the signal in cavity is equal the phase
of the signal after transition through whole resonator
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of the signal after transition through whole resonator
The threshold current
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current at which optical gain of the laser medium equals the
sum of all the losses
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sum of all the losses

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