Spatial coherence of laser output far below threshold
JOSA, Vol. 63, Issue 12, pp. 1550-1552 (1973)
http://dx.doi.org/10.1364/JOSA.63.001550
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Abstract
The light emerging from the output aperture of a laser should be spatially coherent even when the laser is operated far below its threshold and behaves substantially as a thermal source. The spatial coherence has been demonstrated experimentally by photoelectric correlation measurements at different pairs of points in the aperture.
Citation
H. J. Kimble and L. Mandel, "Spatial coherence of laser output far below threshold," J. Opt. Soc. Am. 63, 1550-1552 (1973)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-63-12-1550
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