Two-Photon Emission and Multiphoton Absorption by Atoms.

Bhaskar J. Choudhury

Muhammad Suhail Zubairy, J. J. Yeh

Exact solutions of the master equations which describe single-mode $m$-photon absorption and $m$-photon emission processes in a two-level atomic system are obtained using a density-matrix approach. Some aspects of the photon statistics, e.g., antibunching, are discussed.

Man Mohan, R. K. Thareja

Transition amplitudes corresponding to bound-bound multiphoton transitions with the emission or absorption of one and two Raman photons in the hydrogen atom have been evaluated following a recent method of Reiss. Results show that the transition probability varies smoothly for low values of $N$, where $N$ is the number of intense photons absorbed or emitted during the transition. For larger values of $N$ the amplitude, however, has oscillatory behavior. A particular feature of the present method of calculation is that we find the "reduced" transition amplitude for induced emission of two Raman photons is enhanced compared with single-Raman-photon emission. Another distinctive feature is the appearance of many more extrema in the transition amplitude for higher transitions for multiphoton processes at high intensity.

B. A. Zon, Nikolai L. Manakov, Л. П. Рапопорт

Richard E. Wallenstein

Anne L’Huillier, Louis A. Lompre, G. Mainfray +1 more

This paper describes the production of multiply charged ions induced by collisionless multiphoton ionization of rare gases at 532 and 1064 nm. The production of multiply charged ions emphasizes atomic properties and laser characteristics. Multiphoton absorption is expected to selectively excite high ionic energy states, which could induce a stimulated emission in the extreme ultraviolet.