Effects of Hard Apertures on Mode Properties of Resonators with Gaussian Reflectivity Mirrors
INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE SAINTE-FOY (QUEBEC) CENTRE DEL'ENERGIE
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The effects of hard apertures on the energy distribution, the far- field beam quality, the mode volume, and the discrimination against high-order modes in Cassegrain resonators with Gaussian reflectivity mirrors have been investigated both theoretically and experimentally. It has been shown that, in the far field, the fraction of energy in the secondary lobes remains small as long as the ratio of the design beam waist to the radius of the gain medium w sub ba is 0.40. For w sub ba 0.7, deterioration of the beam quality and diffraction losses counterbalanced a more efficient filling or the gain medium to limit the resonator efficiency. At low magnifications, resonators with Gaussian mirrors out perform resonators with standard mirrors.
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