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High spatial frequency laser induced periodic surface structure formation in germanium by mid-IR femtosecond pulsesAustin, Drake. R.; Kafka, Kyle R. P.; Lai, Yu Hang; Wang, Zhou; Zhang, Kaikai; Li, Hui; Blaga, Cosmin I.; Yi, Allen Y.; DiMauro, Louis F.; Chowdhury, Enam A. · Journal of Applied Physics · 2016