Analysis of laser drilled deep holes in stainless steel by superposed pulsed Nd:YAG laser radiation

State-Of-Art, Challenges, and Outlook on Manufacturing of Cooling Holes for Turbine Blades

“…Many industrial and academic researchers have completed some experimental works of hole making using LD process. For example, Brajdic et al (2008), Biermann and Heilmann (2011), and Teixidor et al (2013) investigated the effects of the laser parameters such as drilling time, laser peak power, pulse intensity, and pulse frequency on the form accuracy and surface quality using stainless steel and tool steel. Quintana et al (2009) and Yilbas et al (2011) investigated hole making on nickel-based alloys and titanium alloys.…”

Laser processing of medical devices

“…These pulse shapes have been found to give benefits in many applications of these lasers, including drilling. Modulation of the millisecond pulses by a Q-switched laser has also been shown to improve hole drilling (Brajdic et al, 2008). Breaking a high energy pulse used in deep-hole drilling into a succession of shorter pulses improves the drilling rate (Li et al, 2002).…”

Laser Drilling of Metallic and Nonmetallic Substrates

“…Several authors have reported the importance of the spatial and temporal superimposition of two laser pulses, laser pulse shaping, temporal modulation to alter the material interaction process during laser drilling, and to improve the drilling efficiency and quality in terms of reduced recast and taper (31,47,61,103,104,147,148). This is associated with the absorption and scattering of laser radiation in the plasma, the metal vapor, and droplets ejected inside the keyhole.…”