Abstract
With the development of high-power laser sources, it has become possible to study a new class of collisional-radiative reactions. Theoretical and experimental studies of such collisionally-aided reactions, which require the action of a collision and an external radiation field simultaneously, were aimed initially at calculating or measuring the overall initial to final state cross-sections /1/- Subsequently, it became appreciated that such reactions can also produce coherence among degenerate magnetic sublevels, and that a study of the final state magnetic polarization yields additional information concerning the collisional interaction /2/. In a parallel development /3/, a series of experiments was carried out in which a collisionally-aided excitation of a coherence between the non-degenerate 3P1/2 and 3P3/2 states of Na was generated.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
For a general review of this subject area, see Photon-Assisted Collisions and Related Topics, edited by N.K. Rahman and C. Guidotti (Harwood Academic, Chur, Switzerland, 1982) and Colloquium on Atomic and Molecular Collisions in a Laser Field, J. de Physique, volume 46, Colloque CI (1985).
For a review of the use of so-called “optical” collisions to create magnetic-state coherences, see K. Burnett, Comment At. Mol. Phys. 13, 179 (1983); Phys. Rep. 118, 339 (1985). For creation of magnetic-state coherence in so-called radiative collisions, see P.R. Berman, Phys. Rev. A22, 1838, 1848 (1980); A. Debarre, J. Phys. B15, 1693 (1982).
N. Bloembergen, H. Lotem and R.T. Lynch, Jr., Indian J. Pure and Applied Phys. 16, 151 (1978); Y.A. Prior, A.R. Bogdan, M. Dagenais and N. Bloembergen, Phys. Rev. Lett. 46, 111 (1981); A.M. Bogdan, M. Downer and N. Bloembergen, Phys. Rev. A24, 623 (1981). For a recent excellent review of this subject, see L. Rothberg, to appear in Progress in Optics.
P.R. Berman and E. Giacobino, Phys.Rev. A28, 2900 (1983); P.R. Berman, Phys. Rev. B 29, 3234 (1984).
D. DeBeer, L.G. Van Wagenen, R. Beach and S.R. Hartmann, Phys. Rev. Lett. 56, 1128 (1986).
As the collision rates approach zero,the second term in Eq.(2) must be modified to include effects of atomic motion and spontaneous decay. When this is done, it is found that, even at δ21 = 0, the second term vanishes as the collision rates go to zero.
The fifth order mentioned here is to be distinguished from pure field saturation effects (see, for example, H. Friedmann and A.D. Wilson-Gordon, Phys. Rev. A26, 2768 (1982); B. Dick and R.M. Hochstrasser, J. Chem. Phys. 75, 133 (1983); G.S. Agarwal and N. Nayak, Phys. Rev. A33, 391 (1986)) which are negligible in our experiment.
E. Giacobino and P.R. Berman, submitted to Phys. Rev. Lett..
Values are taken from the article of Allard and Kielkopf (N. Allard and J. Kielkopf, Rev. Mod. Phys. 54, 1103 (1980)).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1987 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Giacobino, E., Berman, P.R. (1987). Collisionally Aided Coherent Emission at an Optical Frequency. In: Rahman, N.K., Guidotti, C., Allegrini, M. (eds) Photons and Continuum States of Atoms and Molecules. Springer Proceedings in Physics, vol 16. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-71778-9_33
Download citation
DOI: https://doi.org/10.1007/978-3-642-71778-9_33
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-71780-2
Online ISBN: 978-3-642-71778-9
eBook Packages: Springer Book Archive