Investigation of Laser Induced Plasma Assisted Ablation of Glass in Presence of Magnetic Field

The present paper is devoted to the study of glass ablation with laser-induced plasma and the effect of the magnetic field on this process. In the experiments, a nanosecond pulsed laser with a wavelength of 532 nm and copper with 2 mm thickness is used as the laser source and the metal substrate respectively. Two permanent neodymium magnets (4500-4800 G) are used to apply an external magnetic field to the drilling zone and to make ablation on the laboratory slide glass. The laser fluence is selected in 4 levels of 1, 1.5, 3, and 3.5  and the characteristics of the holes made with 50 pulse laser radiation are compared in terms of dimensions and morphology. It is observed that by applying a magnetic field, the removed material volume increases about 2 to 2.4 times in the lower fluences and 31 to 35 times in the higher fluences. In the magnetic field absence, for different levels of laser fluence, depth and diameter are changed from 1.6 to 32 and 10 to 100 microns. However, in its presence, they are changed from 3 to 76 and 11 to 380 microns respectively. The shape of deposited particles on glass is also different in the presence and absence of a magnetic field.