Geodesic
Change in the absorption spectrum of potassium atoms under the action of resonant radiation
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1985), pp. 80-86.

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The broadening of $D$ lines and the two-photon absorption (TPA) line of 4S$_{1/2}\rightarrow$6S$_{1/2}$ potassium atoms due to the high-frequency Stark shift of excited levels in the field of intense monochromatic radiation (ruby laser) has been experimentally studied. . The broadenings were measured by the equivalent width method under conditions of an optically dense $k_0l\gg1$ layer. The dependence of the broadening on the pump intensity, which is quadratic for weak pumping, is revealed; it becomes linear at large intensity parameters. Estimates of the Stark shift of the 4P$_{1/2}$, 4P$_{3/2}$, 6S$_{1/2}$ levels and the broadening of $D$ lines and TPA lines of the potassium atom are given on the basis of experimental data. 
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Zh. O. Ninoyan; B. A. Glushko; G. S. Sarkisyan. Change in the absorption spectrum of potassium atoms under the action of resonant radiation. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1985), pp. 80-86. http://geodesic.mathdoc.fr/item/UZERU_1985_3_a13/

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