|
|||||
|
|
Steady-state mechanism for polymer ablation by a free-running Er:YAG laser |
|
| Authors: | DM Bubb AO Sezer F Rezae SP Kelty |
| Institution: | a Department of Physics, Rutgers University-Camden, Business and Science Building, 227 Penn Street, Rutgers University, Camden, NJ 08102, United States b Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, United States c Department of Chemistry, Haverford College, Haverford, PA 19041, United States d Department of Economics, Seton Hall University, 400 S. Orange Avenue, South Orange, NJ 07079, United States e Department of Chemistry and Biochemistry, Seton Hall University, 400 S. Orange Avenue, South Orange, NJ 07079, United States f Center for Computational Research, Seton Hall University, 400 S. Orange Avenue, South Orange, NJ 07079, United States |
| Abstract: | A free-running Er:YAG laser is used to ablate polyethylene glycol and the ablation yield is studied as a function of molecular weight (1000-10,000 g/mol) and laser fluence (8-25 J/cm2). A steady-state ablation mechanism is proposed which includes recoil-induced expulsion as the primary contributor to the ablation yield. It is also proposed that the formation of a molten layer is a necessary part of the ablation mechanism because the calculated tensile strengths for the solid polymer are too large to permit fracture of the target due to the laser-induced stress transient. The ablation yield is found to depend in a sigmoidal fashion upon laser fluence, thus implying a variable ablation enthalpy. Finally, the current results are compared with that obtained previously with a free electron laser. |
| Keywords: | 61 41 +e 78 30 &minus j 81 05 Lg 81 15 Fg |
| 本文献已被 ScienceDirect 等数据库收录！ | |