Time Resolved Laser Spectroscopy : Quantum Beats and Superradiance
The purpose of this paper is to describe some recently performed time resolved transient experiments in Laser Spectroscopy. Experiments in this field have developed very fast in the last few years and allowed to study a wide range of light-matter interaction effects, some of which being mere extensions to the optical range of phenomena already studied in microwave or radiofrequency spectroscopy.
KeywordsLaser Spectroscopy Free Induction Decay Rydberg State Excited Atom Exciting Pulse
Unable to display preview. Download preview PDF.
- (3).C.L. TANG and B.D. SILVERMAN, in Physics of Quantum Electronics, edited by P.L. Kelley, B. Lax and P.E. Tannenwald (McGraw-Hill, New York, 1966).Google Scholar
- (5).For a complete reference survey on Quantum Beats and Quantum Beat Spectroscopy, see S. HAROCHE in High Resolution Laser Spectroscopy, K. Shimoda editor, Springer Verlag 1976.Google Scholar
- (7).It is impossible to give a complete reference list of all papers dealing with superradiance since Dicke first paper (ref. 6 ). We will only quote in the following some references which may be of interest for the reader who wishes to find more information about some specific points. For a general and critical discussion of superradiance in various experimental conditions (small or large samples, strong or small inhomogeneous broadening and so on...), one may refer to R. FRIEDBERG and S.R. HARTMAN, Phys. Rev. AK), 1 728 (1 974).Google Scholar
- (12).For sample large compared to the wavelength, the analysis of superradiance is complicated by the fact that the superradiant pulse is amplified in the medium and thus develops non-uniform polarization and population inversions in the sample. Theories of superradiance in large samples are divided in two categories: those which implicitly or explicitly ignore this complication or find it negligible and deal with uniform samples coupled to a single-mode radiation field and those which take into account the spatial variations in the sample. Among the former, one may quote: N.E. REHLER and J.M. EBERLY, Phys. Rev. A3, 1735 (1971); R. BONIFACIO, P. SCHWENDIMANN and F. HAAKE, Phys. Rev. A4, 302 (1971); R. BONIFACIO and L.A. LUGIATO, Phys. Rev. A11, 1507 (1975). On the other hand, spatial variation of superradiance emission along the sample have been given a great attention by N. SKRIBANOWITZ, I. P. HERMAN, J.C. Mac GILLIVRAY and M.S. FELD in Laser Spectroscopy (R.G. Brewer and A. Mooradian editors, Plenum Press, N.Y. 1975) and ref. (15) below. It is not surprising that these different theories, although they agree about the gross description of the superradiance phenomenon in an extended volume, disagree about the detailed analysis of the time behaviour of the superradiant emission. Although I don’t want to enter into a detailed critical discussion of these theories, I adopt here the more realistic point of view of Skribanowitz et aL which gives obviously a better agreement with experiment (for a discussion of this point, see for example R. FRIEDBERG and B. COFFEY, Phys. Rev. A13, 1645 (1976) and R. BONIFACIO, L.A. LUGIATO and A. CRESCENTINI, Phys. Rev. A13, 1648 (1976).ADSGoogle Scholar
- (15).J.C. Mac GILLIVRAY and M.S. FELD, Phys. Rev A, to be published (1976).Google Scholar