Abstract
Optical components are often damaged by hot images in high power laser system, especially for the final optics assembly. There are several nonlinear optical elements and a focusing lens. So both the hot images in free space propagation and in the focusing system are theoretically and numerically studied. We find that the focusing lens moves the hot images towards the lens. Through Fresnel number, the connection of hot image position in free space propagation and in the focusing system is discussed. What’s more, the nonlinear effect of the focusing lens is also considered for the hot images formation because the lens is sometimes very thick. At last, the influence of the size and modulation depth of scatter on the hot images position and intensity are also given. The hot images analysis is essential for the final optics assembly design, which can shed some light on avoiding the optical damage.
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