Population inversion
Population-inversion and gain estimates for a semiconductor TASER
... Abstract—We have investigated a solid-state design ad- vanced (see Soref et al. in SPIE Proceedings, vol. 3795, p. 516 , 1999) to achieve a terahertz-amplification-by-the-stimulated-emis- sion-of-radiation (TASER). The ...
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Extreme population inversion in the fragments formed by UV photoinduced S–H bond fission in 2 thiophenethiol
... total population inversion between the A ˜ and X ˜ states of the 2-methyl-3-furanthiyl radical and that the previously reported (high) dissociation energy should actually be viewed as a thresh- old energy ...
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Phonon-Assisted Population Inversion of a Single InGaAs/GaAs Quantum Dot by Pulsed Laser Excitation
... The population inversion is achieved in an incoherent regime where the dephasing time is shorter than the laser pulse ...assisted population inversion is observed clearly as a gain- like dip ...
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Phonon-Assisted Population Inversion of a Single InGaAs/GaAs Quantum Dot by Pulsed Laser Excitation
... creating population inversion in QDs through phonon coupling was first investigated for microwave-driven electrostatic quantum ...for population inversion can be met via a microwave Raman ...
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Quantum Zeno Effect and Atomic Population Inversion
... atomic population inversion is ...atomic population inversion and the survival probability of initial state decline rapidly at the early time and then both of them become ...
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Population inversion in optically pumped asymmetric quantum well terahertz lasers
... are population inversion and quantum ...of population inversion, which is dependent on the relative re- population and de-population rates of the participant states, is more ...
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Population inversion in quantum dot ensembles via adiabatic rapid passage
... The inversion produced by ARP is robust with respect to fluctuations in coupling and detuning, and we show directly that this manifests itself as only minor variation in the current drawn per dot, as the number of ...
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Dynamic vibronic coupling in InGaAs quantum dots
... The electron-phonon coupling in self-assembled InGaAs quantum dots is relatively weak at low light intensities, which means that the zero-phonon line in emission is strong compared to the phonon sideband. However, the ...
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Numerical Study of Transient Temperature Distribution in Passively Q Switched Yb:YAG Solid State Laser
... optical pump power. Therefore, the temperature distribution will be altered accordingly and exhibits undulations. The population inversion density has been drawn by a sawtooth time function by Jianlang Li ...
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Lasers
... a population inversion has been established it is also certain that the rate of stimulated emission will surpass that of stimulated absorption, meaning that the irradiance of coherent light generated inside ...
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The study of optical gain for terahertz quantum cascade laser using density matrix method
... There are still some fundamental issues related to the working mechanism of THz QCL at microscopic levels that need some attention, in particular a role of the times of relaxation. They are known to affect the transport ...
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laser2
... Since only a few atoms must be excited into the upper laser level to form a population inversion, a four-level laser is much more efficient than a three-level one, and most practical [r] ...
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Ground-based FTIR water vapour profile analyses
... the inversion is performed on a logarithmic scale. The log-scale inversion significantly reduces the scatter be- tween the RS92 and the FTIR data, particularly below 7 ...log-scale inversion, whereas ...
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A CORRELATION OF PHENOTYPIC CHANGES AND CHROMOSOMAL REARRANGEMENTS AT THE TWO ENDS OF AN INVERSION
... However, there are certain disadvantages to the use of this inversion in a precise analysis of the role of heterochromatin, since the inversion places the roughest locus i[r] ...
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Population balance modelling for a flow induced phase inversion based granulation in a two dimensional rotating agglomerator
... phase inversion (FIPI) based ...a population balance (PB) model to describe the growth of the granules by considering a size independent agglomeration ...
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Eclipsed conformations for simple saturated bonds
... ring inversion, nitrogen inversion and N-CH 2 -R bond rotation becomes slow on the NMR timescale, interconversion of the equivalent forms I and V become slow and the geminal groups on the ring become ...
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Validation of T1 and T2 algorithms for quantitative MRI: performance by a vendor-independent software
... Pixelwise T1 estimates were initialized using a lookup-table search performed in two steps in a T1 interval of 0–4000 ms. First, a step of 50 ms between lookup-table entries was applied for high perform- ance. ...
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Inversion of Parahermitian matrices
... of inversion error but lower in terms of ...for inversion, but the implicitly constrained method offers a lower complexity due to real valued arithmetic even for complex valued problems, and the result- ing ...
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THE EFFECT OF STRUCTURAL HETEROZYGOSITY ON THE DEGREE OF PREFERENTIAL PAIRING IN ALLOTETRAPLOIDS OF ZEA
... The failure to find cytological bridges: The fact that no inversion bridges were found in the allotetraploid inversion heterozygote is somewhat discordant with the testcross [r] ...
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Occam Inversion of Transient Electromagnetic Data in a Layered Medium with Azimuthal Anisotropy
... In the controlled-source electromagnetic method, Li and Pedersen (1991 and 1992) computed electromagnetic fields induced by grounded electric diploes in a half-space or layered medium with azimuthal anisotropy [13] [14]. ...
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