The three-dimensional field distribution of the diffractive cavity mode structure
in a passive, open, unstable resonator is presented as a function of the
equivalent Fresnel number of the cavity. The qualitative structure of this
intracavity field distribution, including the central intensity core (or
oscillator filament), is characterized in terms of the Fresnel zone structure
that is defined over the cavity feedback aperture. Previous related research is
© 1999 Optical Society of America
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