Research on the damage effect of high-energy laser irradiation transmission medium for laser countermeasures

Fiber optic decoy type laser countermeasure equipment, as one of the main means of countering laser guided missiles, ensures the stable transmission of high-energy interference laser using quartz fiber as the transmission medium, which is an important prerequisite for greatly improving the success rate of countermeasure equipment interference. The damage threshold of optical fibers is a key factor determining the upper limit of their transmitted laser energy. This article is based on the mechanism analysis of high-energy laser irradiation on quartz fiber. By establishing a thermal model, using COMSOL software simulation calculation, and combining experimental verification research methods, the damage mechanism and damage threshold of high-energy laser irradiation on quartz fiber are obtained. Through thermal simulation of energy irradiation on quartz fiber at 26mJ, 29mJ, 32mJ, 35mJ, 38mJ, and 41mJ, it is found that the peak temperature at the center point of the quartz fiber spot is close to the melting point of the quartz fiber at 41mJ. Through experimental research on energy irradiation of quartz optical fibers at 26.6mJ, 29.65mJ, 32.43mJ, 35.74mJ, 37.86mJ, and 41.55mJ, it was found that significant damage occurred on the surface of the quartz optical fibers when the energy was 41.55mJ, which is consistent with the simulation results. Through this approach, threshold research on other types of transmission media can be carried out, and damage threshold data can be iteratively optimized to provide basic support for later research on laser countermeasures technology.