Partially Overlapped Dual Laser Beams to Reduce Ablation Craters
Meng-Han Wang1,2, Jun-Le Qu1**, Ming Zhu1,3
1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060 2Shenzhen Yuanqing Environmental Technology Service Co., Ltd, Shenzhen 518071 3Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518000
Abstract：We present our experimental ablation results for partially overlapped dual nanosecond laser beams (PO-DB) on metal and glass surfaces. Numerical simulations are performed to evaluate the crater reduction potential of the PO-DB setup. Damage probability experiments proved the collaboration of two beams within the overlap region. Bright-field and three-dimensional profile measurements verify the reduced ablation area from the proposed PO-DB scheme. Laser-induced plasma is generated when transparent glass is ablated. Atomic emission of Na I ($\sim$589.95 nm) shows comparable signal between the PO-DB set and the traditional single laser beam set. The proposed PO-DB ablation mechanism could also be applied to femtosecond laser systems.
2020, Vol. 37 
