Experiments on Laser Oscillation without Population Inversion

Author(s):  
L. Hollberg ◽  
A.S. Zibrov ◽  
H.G. Robinson ◽  
M.D. Lukin ◽  
D.E. Nikonov ◽  
...  
1995 ◽  
Vol 75 (8) ◽  
pp. 1499-1502 ◽  
Author(s):  
A. S. Zibrov ◽  
M. D. Lukin ◽  
D. E. Nikonov ◽  
L. Hollberg ◽  
M. O. Scully ◽  
...  

1988 ◽  
Vol 43 (4) ◽  
pp. 303-308 ◽  
Author(s):  
Utaro Furukane ◽  
Yasumasa Tsuji ◽  
Toshiatsu Oda

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.


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

1994 ◽  
Vol 91 (9) ◽  
pp. 699-701 ◽  
Author(s):  
Bei Zhang ◽  
Ruo-Peng Wang ◽  
Xiao-Min Ding ◽  
Lun Dai ◽  
Shu-Min Wang

1989 ◽  
Vol 25 (25) ◽  
pp. 1747
Author(s):  
E. Lallier ◽  
J.P. Pocholle ◽  
M. Papuchon ◽  
C. Grezes-Besset ◽  
E. Pelletier ◽  
...  

2020 ◽  
Vol 45 (2) ◽  
pp. 121-132
Author(s):  
Daniel P. Sheehan

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.


2014 ◽  
Vol 89 (4) ◽  
Author(s):  
G. Liu ◽  
V. Zakharov ◽  
T. Collins ◽  
P. Gould ◽  
S. A. Malinovskaya

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