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The spatio-temporal dynamics of a Perot-Fabry CO2 laser is experimentally studied. The cavity is composed of two plane mirrors with a lens inserted between them. The location of the lens permits to control the Fresnel number of the cavity, and so the frequency spacing between transverse modes.[1] In the present configuration, the Fresnel number may be varied continuously from 4 to 15, which corresponds to a transverse frequency interval change from 10 to 20 MHz. The free spectral range is 80 MHz. Two other control parameters are available: the pump parameter and the cavity length (frequency detuning between the cavity resonance and the center of the gain profile).
© 1992 IQEC
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