Spatial measurements near the instability threshold in ultrapure Ge

1992 ◽  
Vol 45 (15) ◽  
pp. 8342-8347 ◽  
Author(s):  
A. M. Kahn ◽  
D. J. Mar ◽  
R. M. Westervelt
Keyword(s):  
Instability Threshold

scholarly journals Observation of direction instability in a fiber ring laser

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Muhammad Assad Arshad ◽  
Alexander Hartung ◽  
Arni Candra Pratiwi ◽  
Matthias Jäger
Keyword(s):  
Pump Power ◽  
Ring Laser ◽  
Instability Threshold ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Pump Power Threshold ◽  
Power Threshold ◽  
Length Scaling

AbstractWe report on the observation of a new phenomenon occurring in a fiber ring laser. This phenomenon is about the transition from an initially bidirectional emission of a reciprocal fiber ring laser to a unidirectional emission at a certain pump power threshold. In addition, the final direction is not predefined but appears to be randomly chosen every time the threshold is exceeded. Therefore, we term this new phenomenon direction instability. Furthermore, we provide a first discussion of how the instability threshold is influenced by the length and the loss of the cavity. We show that the threshold follows a power times length scaling, indicating a nonlinear origin.

Instability threshold in Co/sup 2+/ substituted LiTi ferrites

1990 ◽  
Author(s):  
B.K. Kuanr ◽  
P.K. Singh ◽  
G.P. Srivastava
Keyword(s):  
Instability Threshold

scholarly journals ATOMS IN THE ANIONIC DOMAIN, Z < N

2013 ◽  
Vol 27 (24) ◽  
pp. 1350178 ◽  
Author(s):  
GABRIEL GIL ◽  
AUGUSTO GONZALEZ
Keyword(s):  
Ionization Potential ◽  
Neutral Atom ◽  
Nuclear Charge ◽  
Instability Threshold ◽  
The Other ◽  
Covalent Radius ◽  
Energy Curve ◽  
Fermi Theory ◽  
Thomas Fermi ◽  
Linear Behavior

We study atoms with N electrons, and nuclear charge Z. It is well known that the cationic regime, Z > N, is qualitatively described by Thomas–Fermi theory. The anionic regime, Z < N, on the other hand, is characterized by an instability threshold at Zc ≲ N-1, below which the atom spontaneously emits an electron. We compute the slope of the energy curve at Z = N - 1 by means of a simple model that depends on the electron affinity and the covalent radius of the neutral atom with N - 1 electrons. This slope is used in order to estimate Zc, which is compared with previous numerical results. Extrapolation of the linear behavior in the opposite direction, up to Z = N, allows us to estimate the ionization potential of the atom with N electrons. The fact that the obtained ionization potentials are qualitatively correct is an indication that, with regard to certain properties, neutral atoms are closer to the anionic instability threshold than they are to the Thomas–Fermi, large Z, region. A regularized series is written for the ionization potential that fits both, the large Z and Z → Zc limits.

Transverse mode instability threshold enhancement in Yb-doped fiber lasers by cavity modification

2018 ◽  
Vol 57 (21) ◽  
pp. 5992 ◽  
Author(s):  
Kamran Hejaz ◽  
Mahdi Shayganmanesh ◽  
Ali Roohforouz ◽  
Reza Rezaei-Nasirabad ◽  
Ali Abedinajafi ◽  
...  
Keyword(s):  
Fiber Lasers ◽  
Transverse Mode ◽  
Instability Threshold ◽  
Mode Instability ◽  
Threshold Enhancement

The effect of electron-neutral energy exchange on the fluid Farley-Buneman instability threshold

1997 ◽  
Vol 102 (A11) ◽  
pp. 24091-24115 ◽  
Author(s):  
R. S. Kissack ◽  
J.-P. St.-Maurice ◽  
D. R. Moorcroft
Keyword(s):  
Energy Exchange ◽  
Instability Threshold
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