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On-line process diagnosis of laser drilling in a liquid environment



  1. National Institute for Laser, Plasma and Radiation Physics, Laser Department, Atomistilor 409, 077125 Bucharest- Magurele, Romania
  2. JNO Group SRL, Str. Odai nr. 31, Jilava, Romania


Laser drilling of industrial steel and aluminum in a liquid environment was recorded using a 210× microscope at 40 frames/s. Computing the light emission intensity from recorded images revealed highly specific time evolution depending on the target material and laser repetition rate. A correlation between drilling depth and light emission intensity was made. Based on this correlation and specificity, real time drilling process monitoring and diagnosis should be possible. Mitigation of the effects of gas bubbles on laser-target interaction by heat treatment of the target in vacuum is also outlined..


Picosecond laser, Microprocessing, Ablation in liquid, Repetition rate.

Submitted at: Oct. 2, 2018
Accepted at: April 8, 2019


I. NICOLAE, C. VIESPE, C. GHEORGHE, D. MIU, On-line process diagnosis of laser drilling in a liquid environment, Journal of Optoelectronics and Advanced Materials Vol. 21, Iss. 3-4, pp. 244-250 (2019)