Femtosecond-laser-induced plumes

Mengqi Ye; Constantine P. Grigoropoulos

doi:10.1117/12.428005

29 May 2001 Femtosecond-laser-induced plumes

Mengqi Ye, Constantine P. Grigoropoulos

Proceedings Volume 4276, Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics; (2001) https://doi.org/10.1117/12.428005
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States

Abstract

Femtosecond laser-induced titanium plumes have been studied by emission spectroscopy and imaging, and time-of-flight measurements. The laser pulse is of around 100 fs (FWHM) duration and has a central wavelength of 800 nm. The sample was placed inside a high vacuum chamber. Time-resolved plume emission images were obtained by an ICCD camera. Compared to nanosecond laser- induced plumes, femtosecond laser-generated plumes are much more confined in space, which is due to the lack of direct laser energy absorption by the plume, as well as lower energy per pulse. The emission spectrum was studied with a combination of a monochromator and an ICCD camera. Individual emission lines from both titanium neutrals and ions were identified. Time-of-flight (TOF) experiment showed that extremely energetic ions were present in the plume. These high energies may affect the laser deposition of thin films. A TOF experiment using a nanosecond laser was carried out for comparison. Laser ablated craters were measured with an interferometric microscope, and ablation yield was expressed as a function of applied laser fluence. Two ablation regimes were identified for femtosecond laser ablation of titanium by time-of-flight and microscope measurements.

Citation Download Citation

Mengqi Ye and Constantine P. Grigoropoulos "Femtosecond-laser-induced plumes", Proc. SPIE 4276, Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics, (29 May 2001); https://doi.org/10.1117/12.428005

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