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主振功率放大型装置在高能激光器中有着广泛的应用,在增益体积和沿光轴方向增益长度一定的情况下,为了得到高能化学激光器主振部分和放大级部分的最佳比例,研究了不同振荡放大比对输出光束的近场强度以及最终输出功率的影响.使用快速傅里叶变换的算法经过迭代计算得到了1:4,1:1,2:1三种振荡放大比情况下的近场光束强度分布,并计算了其强度分布均匀性及最终输出功率情况.计算结果表明:采用MOPA结构的氟化氘化学激光器,振荡放大比越大,主振荡部分输出的能量越高,谐振腔内功率密度越大,对腔内镜片的承受能力要求越高;而振荡放大比越小最终输出光束的衍射放大效应越明显,对光束质量越不利.在本文条件下,计算结果还表明,振荡放大比对功率会产生影响,存在一个最佳的比例使得输出功率最大.振荡放大比对输出功率的影响随主振部分输出耦合率,光路中的各种损耗,增益的规模等多种参数的不同而变化,工程运用中可根据具体参数进行计算.
Main power amplification device has a wide range of applications in high-energy lasers. In the case of gain volume and gain length along the optical axis, in order to get the optimal ratio of the main oscillator and the amplification stage of the high-energy chemical laser, Oscillator amplification ratio of the output beam near-field strength and the final output power of the use of Fast Fourier Transform algorithm iterative calculations obtained 1: 4, 1: 1, 2: 1 three kinds of oscillation amplification ratio near The intensity distribution of the beam is calculated and the intensity distribution and the final output power are calculated.The results show that the energy of the main oscillator is higher when the oscillation amplification ratio is larger with MOPA deuteride chemical laser, The higher the internal power density, the higher the requirement for the endoscope’s endurance. The smaller the amplification ratio of oscillation is, the more obvious the diffraction amplification effect of the output beam is and the more disadvantageous the beam quality.In the condition of this paper, the calculation results also show that the oscillation Amplification ratio will have an impact on the power, there is an optimal ratio so that the maximum output power.Operation of the oscillation amplification ratio on the output power with the main oscillator output coupling ratio, Optical path of various losses, the size of the gain and other parameters vary, engineering applications can be calculated according to specific parameters.