- Quantum defect
The term quantum defect is highly ambiguous. Various meanings are discussed below.
Quantum defect in
laserscience, the term quantum defect refers to the fact that the energy of a pump photon is generally higher than that of an "signal photon" (photon of the output radiation). The difference of energies goes to the heat;this heat may carry away the excess of entropydelivered with the multimode uncoherent pump.
The quantum defect of a
lasercan be defined as part of the energy of the pumping photon, which is lost (not turned into photons at the lasing wavelength) in the gain mediumat the lasing.cite journal
title=Heat generation in Nd:YAG and Yb:YAG
IEEE Journal of Quantum Electronics
format=abstract] At given frequency of
pumpand given frequency of lasing, the quantum defect .Such quantum defect has dimension of energy; for the efficient operation, the temperatureof the gain medium(meadured in units of energy) should be small compared to the quantum defect.
At a fixed pump frequency, the higher the quantum defect, the lower is the upper bound for the power efficiency.
Quantum defect in Rydberg atoms
The quantum defect of a
Rydberg atomrefers to a correction applied to the equations governing Rydberg atom behavior to take into account the fact that the inner electrons do not entirely screen their associated charge in the nucleus [http://www.phy.davidson.edu/StuHome/joesten/IntLab/final/rydberg.htm ,Rydberg Atoms and the Quantum Defect at the site of Davidson College, Physics department] .
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