Morphology of femtosecond laser-induced structural changes in MgAl2O4 crystal

Ben-Hai Yu; Neng-Li Dai; Yu-Hua Li; Qi-Guang Zheng; Pei-Xiang Lu

doi:10.1117/12.783369

14 November 2007 Morphology of femtosecond laser-induced structural changes in MgAl₂O₄ crystal

Ben-Hai Yu, Neng-Li Dai, Yu-Hua Li, Qi-Guang Zheng, Pei-Xiang Lu

Proceedings Volume 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 672232 (2007) https://doi.org/10.1117/12.783369
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

The morphology of structural changes in MgAl₂O₄transparent ceramic (MATC) crystal ablated by femtosecond laser pulse has been investigated. Experiments were performed using a commercial Ti:sapphire laser system with 800 nm/50 fs and the repetition ratio of 1 kHz. The damage threshold and ablation area for MgAl₂O₄ transparent ceramic are investigated. The result shows that the darkening threshold and the damage threshold of MATC are measured to be 6.0×10¹² W/cm² and 2.4×1013 W/cm², respectively. The ablated spots are examined by means of a charge coupled device (CCD) camera, scanning electron microscopy (SEM) and atom force microscopy (AFM). The infrared transmission ratio (IR transmission ratio) properties of MATC crystal ablated by femtosecond laser pulse are measured by micro-IR spectra. The result shows that the damaged area will increase linearly with the increasing energy of single pulse while will be approximate satisfied with Boltzmann distribution with the increasing number of multiple pulses. The spot ablated at optimized energy pulses (near the damage threshold energy) can improve the IR transmission ratio of MATC crystal from 82% to 86%. Furthermore, the periodic ripples about 100 nm in width and 200 nm in neighbouring ripples distance are formed on the bottom surfaces of ablation holes.

Citation Download Citation

Ben-Hai Yu, Neng-Li Dai, Yu-Hua Li, Qi-Guang Zheng, and Pei-Xiang Lu "Morphology of femtosecond laser-induced structural changes in MgAl₂O₄ crystal", Proc. SPIE 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 672232 (14 November 2007); https://doi.org/10.1117/12.783369

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