Experimental study of rear surface damage of BK7 glass under irradiation of the millisecond laser assisted by the nanosecond laser

D. D. Chen; Y. X. Pan; Z. H. Shen; J. Lu; X. W. Ni

doi:10.1117/12.2587682

2 December 2020 Experimental study of rear surface damage of BK7 glass under irradiation of the millisecond laser assisted by the nanosecond laser

D. D. Chen, Y. X. Pan, Z. H. Shen, J. Lu, X. W. Ni

Author Affiliations +

Proceedings Volume 11717, 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics; 117173M (2020) https://doi.org/10.1117/12.2587682
Event: 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics, 2020, Shanghai, China

Abstract

In this paper, a millisecond laser combined with a nanosecond laser (CPL) was used to interact with the BK7 glass. The influence of the laser fluence and the delay time on the rear surface damage feature was studied. Results show that the damage on the rear surface of BK7 glass was generated by the stress due to the CPL irradiation. Two types of damage morphologies called small damage points (SDP, on the order of hundreds of micrometers) and large damage points (LDP, on the order of several millimeters to centimeters), respectively, were observed. The SDP can be generated by the CPL with low millisecond laser fluence or high delay time, while the LDP showed the opposite feature. The averaged size of the damage point increased with the millisecond laser fluence and dropped rapidly when the delay increased from 600 μs to 800 μs.

Citation Download Citation

D. D. Chen, Y. X. Pan, Z. H. Shen, J. Lu, and X. W. Ni "Experimental study of rear surface damage of BK7 glass under irradiation of the millisecond laser assisted by the nanosecond laser", Proc. SPIE 11717, 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics, 117173M (2 December 2020); https://doi.org/10.1117/12.2587682

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