Publication Type:

Journal Article

Source:

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, Volume 227, Number 11, p.1714-1723 (2013)

URL:

http://www.scopus.com/inward/record.url?eid=2-s2.0-84889027963&partnerID=40&md5=6442ef3a585e49924879234091770a2c

Keywords:

Ablation thresholds, Crystalline germanium, Crystalline materials, Germanium, Laser-material interactions, Material removal, Micro-Raman analysis, Micromachining, Multi-pulse irradiation, Optical penetration depth, Processing parameters, Pulse repetition rate, Surface roughness, Ultrafast lasers, Ultrashort pulses

Abstract:

Microgrooving on crystalline germanium (Ge) 〈100〉. surface using 1064 nm wavelength ultrafast laser pulses under ambient condition is investigated. The interaction of laser and target material and the influence of processing parameters such as laser power, pulse repetition rate and scan speed on the groove dimensions and surface roughness are studied. For the laser radiation fluence range used (0.4-0.8 J/cm2), material removal is primarily controlled by optical penetration depth. The depth and width of grooves increase with laser power. In multipulse irradiation, heat accumulation due to residual thermal energy from successive laser pulses results in a greater material removal. Furthermore, groove depth and width decrease as the pulse repetition rate increases from 0.5 to 2 MHz, due to the decrease in pulse energy with an increase in repetition rate causing ablation threshold fluence to move towards the central portion of the Gaussian pulse. Surface roughness has not shown significant changes for the parameters used in this study. A micro-Raman analysis of groove surfaces reveals a change in the crystallinity of the Ge due to laser irradiation. © IMechE 2013.

Notes:

cited By (since 1996)0

Cite this Research Publication

Sab Manickam, Wang, Ja, and Huang, Cc, “Laser-material interaction and grooving performance in ultrafast laser ablation of crystalline germanium under ambient conditions”, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, vol. 227, pp. 1714-1723, 2013.

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