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For the asymmetric plane-plane cavity, the influence of cavity length as a variable factor on the thermal lens diopter, dynamic stable zone, and modes selection in the stable zone is discussed. The relationship between the length of the cavity and the width of the dynamic stability zone is pointed out. The influence of the ratio of the long arm to the short arm on the degree of separation of the various oscillation modes is indicated. A suitable pump operating point for modes selection is indicated. A end-pump Nd:YVO4 cavity with different long arms is built up for modes selection experimentally, the fundamental mode and hollow beam (TEM01+TEM10) output are observed in the experiments, which are concordant with the theoretical predictions.
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