Phys. Rev. Lett. 75, 4027–4030 (1995)Spatiotemporal Dynamics of Lasers with a Large Fresnel NumberReceived 14 November 1995; published in the issue dated 27 November 1995 We measure the local intensity and the intensity cross-correlation function of patterns emitted by a CO2 laser with a Fresnel number around 60 and find evidence of weak turbulence. We show theoretically that the spatiotemporal dynamics of such a laser can be governed by two fields. One leads to a "turbulent" state principally through phase fluctuations, whereas the other yields a periodic modulation in space and time of the intensity. This can explain why the intensity of the laser is locally chaotic but the time-averaged intensity pattern retains the global symmetry of the system. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.75.4027
DOI:
10.1103/PhysRevLett.75.4027
PACS:
05.45.+b, 42.55.-f, 42.60.Mi, 47.20.Ky
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