Supported by the National Basic Research Programme of China under Grant No 2006CB806000b, and the National Natural Science Foundation of China under Grant No 50672087, and the Shanghai Leading Academic Discipline Project under Grant No T0104.
Multiple refocusing of a tightly focused femtosecond laser due to the dynamic transformation between self-focusing and self-defocusing is employed to provide a novel method to produce quasi-periodic voids in glass. It...