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Atomic Model Calculations of Gain Saturation in the 46.9 nm Line of Ne‐like Ar
Author(s) -
Kukhlevsky S.V.,
Ritucci A.,
Kozma I.Z.,
Kaiser J.,
Shlyaptseva A.,
Tomassetti G.,
Samek O.
Publication year - 2002
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/1521-3986(200201)42:1<109::aid-ctpp109>3.0.co;2-b
Subject(s) - saturation (graph theory) , atomic physics , radiation trapping , electron density , electron temperature , plasma , saturation current , materials science , electron , ion , physics , laser , optics , voltage , nuclear physics , mathematics , combinatorics , quantum mechanics
The gain saturation in the 46.9 nm line of the Ar +8 laser is analyzed using an atomic kinetics code. The dependence of the gain ( G ) on the electron kinetic temperature ( T e ) in the region (50 ‐150 eV) is calculated in the quasi steady‐state approximation for the different values of the electron density ( N e ) and the plasma radius ( r pl ). The influence of radiat on trapping, ion random and mean velocities, Stark line broadening and refraction losses on the gain saturation is taken into consideration. For r pl = 150‐600 μm, the amplplication ( G > 0 cm ‐1 ) exists in the large temperature/density domain ( T e = 60‐150 eV, N e = 0.5‐10 × 10 18 cm ‐3 ). However, the value G s ∼ 1.4 cm ‐1 required for the gain saturation at the typical plasma length L pl ∼ 15 cm is reached in the extremely narrow density regions at the high temperatures. The saturation is reached for r pl = 600 μm at T s e = 150 eV in the region N s e = 1.8‐2 × 10 18 cm ‐3 , for r pl = 300 μm at T s e = 125 eV and N s e = 2.5‐3 × 10 18 cm ‐3 , and for r pl = 150 μm at T s e = 110 eV and N s e = 3‐4 × 10 18 cm ‐3 . The broadest density region ( N s e = 2 ‐8 × 10 18 cm ‐3 ) is predicted for the narrowest column ( r pl = 150 μm) at the highest temperature ( T s e = 150 eV). The operation in the broadest density region N s e , should make easier achievement of the gain saturation in the experiments.