Study the Damage Effects of Different Laser Pulses on the Pyrotechnic Bridge

lasers are used more and more widely in daily life, medicine and aerospace fields, which promoted the development of all kinds of laser and laser technology. With the continuous breakthroughs in the research field, the application of high power lasers is also more extensive. When the frequency doubling light is emitted from the laser, different wavelengths will act on the separation film simultaneously. Therefore, it is necessary to investigate the damage of optical thin films by laser of single wavelength or multiple wavelengths. The film was irradiated repeatedly by laser aiming, and the damage radius and damage morphology were studied under the action of 1064nm laser and 532nm laser alone and together, as well as the primary and secondary relationship of the damage induced by the two wavelengths. Then, the distribution of explosive damage temperature field was analyzed by simulation. It is concluded that the damage radius at 532nm is larger than that at 1064nm, and the damage depth is deeper. When the two pulses work together, 532nm laser plays a dominant role in the damage process. This study is helpful to better understand the damage mechanism of bridge film and provide reference for the preparation of damage-resistant explosive bridge and laser ignition.