Abstract
A new geometry of a resonator for diode-array pumped solid-state laser is analysed. A numerical modelling showed that a longitudinally pumped thin solid-state slice with transversely periodic distribution of inversion could select spatially periodic (Talbot) modes, with a diffraction limited far field, the Fresnel number being equal to the square of periods of inversion. The influence of spatial inhomogeneity of the gain, gain saturation, finite aperture and roughness of the mirrors is considered. It is found that a fundamental gaussian mode picture, typical for the single diode pumping, is gradually transformed into a transversely periodic mode along with the increase of the number of elements in the diode array, if the resonator length is half or quart of the Talbot one. It is shown that perfect in-phase lasing from the whole aperture is possible only for a limited number of elements because of the small phase distortions induced by the roughness of the mirrors and the thermal lenses inside the active slice.
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