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基于直接液冷的固体激光技术发展需要,理论研究了管道流冷却流场的湍流特征诱导出激光波前相位畸变的物理机理。利用管道湍流的统计特性,提出了一套管道湍流激光相屏的构造方法。在不可压缩流假设下研究了两种湍流热效应(输运传热和耗散产热)引起的温度脉动对光束波前的影响。结果表明,此状态下光束质量的退化主要来自于输运传热,而非耗散产热。进一步讨论了轻微密度扰动导致的波前畸变量大小。
Based on the need of direct liquid-cooled solid-state laser technology, the physical mechanism of the laser-induced phase distortion induced by the turbulent characteristics of the pipe flow cooling flowfield is theoretically studied. Based on the statistical characteristics of pipeline turbulence, a method of constructing a pipeline turbulent laser phase screen is proposed. Under the incompressible flow assumption, the effects of two kinds of turbulent thermal effects (transport heat transfer and dissipative heat production) on the wavefront of the laser are studied. The results show that the degradation of the beam quality in this state mainly comes from the transport heat transfer, but not the dissipation heat generation. The magnitude of wavefront distortion caused by slight density disturbance is discussed further.