激光复合损伤机理与效应研究

Mechanism and effects of complex laser ablation

达到或者超过100 k W的激光输出是激光武器用于反导反卫等战略防御的终极发展目标。基于激光武器发展目标与最新动向,提出了多模式激光复合损伤新思路,即采用不同波长、连续与脉冲、频率变化的激光,同时或交替作用在同一靶材上,获得更好的损伤效果。构建了脉冲/连续激光复合损伤物理模型,并用有限元法进行了仿真模拟,使用2 k W连续激光器与10 J长脉冲激光器开展了损伤对比实验。模拟和实验结果表明,脉冲激光烧蚀金属靶材效果优于连续激光;在两种激光复合或交替作用下出现"非线性雪崩烧蚀"效应,复合烧蚀效果明显优于脉冲激光,烧蚀质量是脉冲激光的13倍。这一效应,为战术激光武器向"合束多模式同轴输出"新体制发展提供了基础。

For antimissile, antisatellite, or such kind of strategic defense application, laser weapon is expected to emit 100 kW power or higher level. By considering the development and its object of laser weapon, a new damnification method using multi-mode laser was presented. Using the lasers, different in wavelength, pulsed and continuous wave, frequency verified, focused on target commutatively or synchronously to get more effective result. A complex damnification model was conceived and simulated by using finite element method. A 2 kW continuous wave laser and a long pulse width laser were used in the damage comparison experiments. Both the simulation and experiments results indicate that pulsed laser is better than continuous in metal ablation, furthermore, complex laser is much better. Comparing with pulsed laser, complex laser inspires ＂nonlinear avalanche ablation＂ effect, which makes the ablated metal 13 times more than using pulsed laser. This ＂nonlinear avalanche ablation＂ effect makes a base for ＂multi-mode coaxial combined＂ laser weapon.