Time-of-flight and emission spectroscopy study of femtosecond laser ablation of titanium
Journal Article
·
· Journal of Applied Physics
Femtosecond laser ablation of titanium has been studied via time-of-flight (TOF) and emission spectroscopy measurement. Laser pulses of 80 fs full width at half maximum at {lambda}=800nm were delivered by a Ti:sapphire femtosecond laser system. A vacuum chamber with a base pressure of 10{sup -7}Torr was built for ion TOF measurement. These ion TOF spectra were utilized to determine the velocity distribution of the ejected ions. While nanosecond laser ablation typically generates ions of tens of eV, femtosecond laser irradiation even at moderate energy densities were found to produce energetic ions with energies in the range of a few keV. Two ablation regimes, exhibiting different laser fluence dependence of the total ion yields, and the corresponding percentage of energetic ions and the crater depth, were identified and explained on the basis of the two-temperature model. Clean craters were observed by interferometric microscope measurements, indicating the advantages of and potential for applying femtosecond lasers to micromachining and advanced materials treatment. Emission spectroscopy and imaging have been carried out via a monochromator and an intensified CCD camera. Femtosecond laser-induced plumes were found to be much smaller and weaker in intensity than those induced by nanosecond laser pulses.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40204950
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 89; ISSN 0021-8979
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ultraviolet femtosecond and nanosecond laser ablation of silicon: Ablation efficiency and laser-induced plasma expansion
Absence of amorphous phase in high power femtosecond laser-ablated silicon
Metal particles produced by laser ablation for ICP-MSmeasurements
Technical Report
·
Mon Mar 22 23:00:00 EST 2004
·
OSTI ID:836676
Absence of amorphous phase in high power femtosecond laser-ablated silicon
Journal Article
·
Sun Jan 04 23:00:00 EST 2009
· Applied Physics Letters
·
OSTI ID:21175846
Metal particles produced by laser ablation for ICP-MSmeasurements
Journal Article
·
Fri Jun 01 00:00:00 EDT 2007
· Talanta
·
OSTI ID:928025