Experiments on Laser Oscillation without Population Inversion

1996 ◽  
Author(s):  
L. Hollberg ◽  
A.S. Zibrov ◽  
H.G. Robinson ◽  
M.D. Lukin ◽  
D.E. Nikonov ◽  
...  
Keyword(s):  
Population Inversion ◽  
Laser Oscillation

Experimental Demonstration of Laser Oscillation without Population Inversion via Quantum Interference in Rb

1995 ◽  
Vol 75 (8) ◽  
pp. 1499-1502 ◽  
Author(s):  
A. S. Zibrov ◽  
M. D. Lukin ◽  
D. E. Nikonov ◽  
L. Hollberg ◽  
M. O. Scully ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Population Inversion ◽  
Laser Oscillation ◽  
Experimental Demonstration

Initial Condition and Cooling Time of Recombining Helium Plasma for Stationary VUV Lasing Action

1988 ◽  
Vol 43 (4) ◽  
pp. 303-308 ◽  
Author(s):  
Utaro Furukane ◽  
Yasumasa Tsuji ◽  
Toshiatsu Oda
Keyword(s):  
Plasma Density ◽  
Population Inversion ◽  
Short Pulse ◽  
Initial Density ◽  
Helium Plasma ◽  
Laser Oscillation ◽  
Optimum Conditions ◽  
Short Pulse Laser ◽  
Initial Plasma ◽  
Inversion Mechanism

Calculated optimum conditions as to initial electron density and cooling rate of a recombining helium plasma for the production of VUV laser oscillation of the Hell 164 nm line are presented together with an explanation of the population inversion mechanism. For high initial plasma density (~1018 cm-3) rapid cooling (τE ≦10-13 sec) should produce a short pulse laser oscillation. For medium initial density (~ 10-16 cm-3), stationary laser oscillation can be produced by much slower cooling (τE ~ 10-8 sec) but on cooling with τE > 10-7 sec the oscillation can hardly be realized. For lower initial plasma density ( ≦ 1015 cm-3), laser oscillation is not possible because the population inversion obtained is not sufficient.

Laser Oscillation without Population Inversion in a Sodium Atomic Beam

1996 ◽  
Vol 76 (12) ◽  
pp. 2053-2056 ◽  
Author(s):  
G. G. Padmabandu ◽  
George R. Welch ◽  
Ivan N. Shubin ◽  
Edward S. Fry ◽  
Dmitri E. Nikonov ◽  
...  
Keyword(s):  
Atomic Beam ◽  
Population Inversion ◽  
Laser Oscillation

Observation of laser oscillation without population inversion in InGaAsP microdisk lasers

1994 ◽  
Vol 91 (9) ◽  
pp. 699-701 ◽  
Author(s):  
Bei Zhang ◽  
Ruo-Peng Wang ◽  
Xiao-Min Ding ◽  
Lun Dai ◽  
Shu-Min Wang
Keyword(s):  
Population Inversion ◽  
Laser Oscillation ◽  
Microdisk Lasers

Erratum: Laser oscillation of single-mode channel waveguide in Nd:MgO:LiNbO3

1989 ◽  
Vol 25 (25) ◽  
pp. 1747
Author(s):  
E. Lallier ◽  
J.P. Pocholle ◽  
M. Papuchon ◽  
C. Grezes-Besset ◽  
E. Pelletier ◽  
...  
Keyword(s):  
Single Mode ◽  
Channel Waveguide ◽  
Laser Oscillation

Supradegeneracy and the Second Law of Thermodynamics

2020 ◽  
Vol 45 (2) ◽  
pp. 121-132
Author(s):  
Daniel P. Sheehan
Keyword(s):  
Steady State ◽  
Statistical Mechanics ◽  
Population Inversion ◽  
Laboratory Experiments ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Boltzmann Factor ◽  
Energy Currents ◽  
Non Equilibrium

AbstractCanonical statistical mechanics hinges on two quantities, i. e., state degeneracy and the Boltzmann factor, the latter of which usually dominates thermodynamic behaviors. A recently identified phenomenon (supradegeneracy) reverses this order of dominance and predicts effects for equilibrium that are normally associated with non-equilibrium, including population inversion and steady-state particle and energy currents. This study examines two thermodynamic paradoxes that arise from supradegeneracy and proposes laboratory experiments by which they might be resolved.

scholarly journals Population inversion in hyperfine states of Rb with a single nanosecond chirped pulse in the framework of a four-level system

2014 ◽  
Vol 89 (4) ◽  
Author(s):  
G. Liu ◽  
V. Zakharov ◽  
T. Collins ◽  
P. Gould ◽  
S. A. Malinovskaya
Keyword(s):  
Population Inversion ◽  
Level System ◽  
Chirped Pulse
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