The establishment of approximative mathematical model and approximative calculation are presented.

建立了近似数学模型和介绍了近似计算方法。

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The approximative linearization to factors, simplifying analysis process indeed, lead to the result that would possibly differ from the real fact.

这些因素的近似线性化虽然简化了分析过程，但所得结果可能与工程实际偏离较大。

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Approximative analytical expressions are derived for the dispersion relations, the resonance frequencies and the threshold gains of the laser modes.

导出了激光模的色散关系、共振频率和阈值增益的近似解析表达式。

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