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对影响CO2激光准相位匹配倍频效率的因素进行了研究,利用非线性耦合波动方程,分析了在不同基频光功率密度条件下,倍频过程中晶体吸收、界面损耗、周期长度误差和温度变化对倍频效率的影响;对制备高效率CO2激光倍频晶体的误差容限参数进行了计算。当基频光强度为25MW/cm2,晶体键合层数为60层时,必须将每层界面损耗控制在0.5%以下,周期长度误差控制在1μm以内,能保证理论倍频效率40%,为准相位匹配晶体的制备参数的确定提供理论依据。
The factors which affect the quasi-phase-matching frequency doubling efficiency of CO2 laser are studied. By using the nonlinear coupled wave equation, the influences of different fundamental frequency optical power density, such as crystal absorption, interface loss, period length error and temperature The effect of the variation on the frequency doubling efficiency was calculated. The error tolerance parameters for the preparation of the high efficiency CO2 laser frequency doubling crystal were calculated. When the fundamental frequency light intensity is 25MW / cm2 and the number of crystal bonding layers is 60 layers, the interface loss of each layer must be controlled below 0.5% and the period length error within 1μm to ensure the theoretical doubling frequency efficiency of 40% The preparation of quasi-phase matching crystals provides the theoretical basis for the determination of the preparation parameters.