This article is cited in 1 paper

Influence of spatial coherence of a laser field on the efficiency of two-photon absorption

T. N. Smirnova, E. A. Tikhonov


Abstract: An investigation was made of the dependence of the two-photon absorption of ruby laser radiation in alcohol solutions of rhodamine 6 G on the intensity of the exciting field in the case of single-frequency emission and emission of a large number of transverse modes. The efficiency of the two-photon absorption in the case of multimode excitation was 1.8 times (determined with a relative error of 25%) greater than the efficiency of the absorption as a result of single-frequency excitation. The measured absorption coefficient was close to that calculated on the assumption that the single-frequency field was spatially coherent and the spatial fluctuations of the multimode field were described by a Gaussian distribution.

UDC: 621.375.8

PACS: 42.65.Dr, 42.60.Nj, 78.45.+h

Received: 12.06.1975

 English version: Soviet Journal of Quantum Electronics, 1976, 6:1, 23–26