Abstract
By means of boundary finite-element method,the field distribution and eigenvalue of the fundamental mode of the plano-concave resonator with a Gaussian-reflectivity plane mirror are calculated and discussed.The results show that the radius of the mode increase following the decreasing of the characteristic radius of the Gaussian-reflectivity.The radius of the mode is not affected by the changes of the amplitude-reflectivity of mirror center.The characteristic radius of the Gaussian-reflectivity affect the far field distribution of the laser mode.While its value is small,the far field distribution has the diffraction ring around the main peak.In addition,if light is reflected completely at the center of the Gaussian-reflectivity plane mirror,the changes of the far field distribution is not obvious with the characteristic radius of the Gaussian-reflectivity changing.The mode eigenvalue increases with the characteristic radius of the Gaussian-reflectivity increasing.
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