Double Pulse Laser Breakdown K9 Glass Thermal Effects

In this paper, we established the calculation model of temperature rise of K9 glass under dual-pulse laser, then we calculated and analyzed the regulation of temperature rise while we used dual- pulse laser heating the K9 glass using finite element method.Using this model, we studied the temperature distributions of K9 glass after the irradiations of a single nanosecond pulse laser and dual-pulsed laser and analyzed the impact of different pulse intervals and different pulse energy on temperature changes of the K9 glass. The results show that:under the irradiation of nanosecond laser pulses, the temperature of K9 glass reach 104K magnitude, and in the role of milliseconds, the temperature rise of K9 glass only to a few hundred K, and in the role of the double pulse, the temperature rise of the K9 glass can get to105K magnitude. Relative to the single pulse laser, neither nanosecond nor millisecond, the combination of nanosecond and millisecond can cause greater damage to the K9 glass. This is because that a single nanosecond pulse power density is high, but the total energy is smaller, so the damage is limited. Long-pulse laser has high total energy, but due to the low power density, K9 laser absorption is very small, so the damage is not significant. The combination of the two can take advantage of the advantages of both sides, so that the laser energy deposited on K9 glass, causing more damage.The research results in this paper will facilitate the study of laser irradiated on medium, They will also promote the development of laser induced plasma applications.