Mechanism and effects of complex laser ablation

Yong, 程勇 Cheng; Mengzhen, 朱孟真 Zhu; Yunfeng, 马云峰 Ma; Jingsong, 魏靖松 Wei; Xu, 刘旭 Liu; Fangzheng, 丁方正 Ding; Chaoyong, 谭朝勇 Tan; Xia, 陈霞 Chen; Yanlong, 郭延龙 Guo; Hua, 初华 Chu

doi:10.3788/irla201645.1105005

Cited by 4 publications

(1 citation statement)

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“…A multi-mode composite laser consists of lasers with different wavelengths, different systems, and different frequency changes that act on the target at the same time or alternately to obtain a better damage effect than a single continuous-wave or Pulsed-laser. Related studies have been conducted on composite lasers: Cheng [10] carried out an experimental study on the combined damage of a 1030 nm continuous laser and a 1064 nm pulsed laser and found that the "non-linear avalanche ablation" effect occurred under the combined or alternating effects of two lasers, which made the combined laser have a stronger ablation effect than the pulse laser. The experimental results showed that the average single-pulse ablation amount of the composite laser was 13 times that of the pulse laser.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Damage of Optical Materials by out of Band Composite Laser

et al. 2020

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For the paper, experimental studies were performed on the damage of the Ge- and Si-based flat window by lasers out-of-band. The experimental results showed that lasers out-of-band can cause film damage and substrate damage to Ge and Si windows. The high-energy laser damage window mechanism mainly manifested as thermal effects. The composite laser damage thresholds for the substrate were an Si window of 21.6 J/cm2 and a Ge window of 3 J/cm2. Compared with continuous laser and long pulse laser experimental results, it was found that the use of long pulse-continuous composite constitution could effectively reduce the damage threshold. Compared to the long-pulse laser, the composite laser could achieve similar damage effects with a smaller energy density.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Damage of Optical Materials by out of Band Composite Laser

et al. 2020

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Research on the Ablation Characteristics and Thermomechanical Coupling Matching of Continuous-Wave/Pulsed Combined Lasers

Xiao

Feng

Ren³

et al. 2022

Photonics

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In laser processing and electro-optical countermeasures, the laser ablation efficiency on the target is of great importance. Compared with traditional single laser irradiation, ablation by continuous-wave (CW)/pulsed combined laser has the advantages of high ablation efficiency, strong controllability, and low laser energy output requirements. However, current research on the synergistic mechanism and matching of combined laser irradiation requires improvement. In this study, damage experiments were mainly conducted on two modes of combined laser, CW/millisecond (CW/ms) and CW/nanosecond (CW/ns) laser. The temperature distribution, ablation rate, and ablation range under different irradiation conditions were tested quantitatively. The ablation characteristics and thermomechanical coupling matching of the combined laser were analysed and physically modelled. The results showed that compared with the pulsed laser alone, the ablation rate of the CW/ms combined mode was greater by approximately one order of magnitude, while that of the CW/ms combined mode was greater by approximately three orders of magnitude. Moreover, the thermomechanical coupling matching of the combined laser can be regarded as the matching of the impact pressure distribution of the pulsed laser with the range of the melting pool. The results of this study may offer guidance for further improving the synergistic enhancement damage mechanism of the combined laser.

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