Formation of subwavelength periodic structures on tungsten induced by ultrashort laser pulses
Optics Letters, Vol. 32, Issue 13, pp. 1932-1934 (2007)
http://dx.doi.org/10.1364/OL.32.001932
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Abstract
The evolution of surface morphology of tungsten irradiated by single-beam femtosecond laser pulses is investigated. Ripplelike periodic structures have been observed. The period of these ripples does not show a simple relation to the wavelength and angle of incidence. The orientation of ripples is aligned perpendicularly to the direction of polarization for linearly polarized light. Surprisingly, we find that the alignment of the ripple structure turned left or right by 45° with respect to the incident plane when using right and left circularly polarized light, respectively. The period of the ripple can be controlled by the pulse energy, the number of pulses, and the incident angle. We find a clear threshold for the formation as a function of pulse energy and number of pulses. The mechanism for the ripple formation is discussed, as well as potential applications in large-area structuring of metals.
© 2007 Optical Society of America
OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(160.3900) Materials : Metals
(190.4350) Nonlinear optics : Nonlinear optics at surfaces
(220.4000) Optical design and fabrication : Microstructure fabrication
ToC Category:
Nonlinear Optics
History
Original Manuscript: March 14, 2007
Revised Manuscript: May 3, 2007
Manuscript Accepted: May 9, 2007
Published: June 25, 2007
Citation
Q. Z. Zhao, S. Malzer, and L. J. Wang, "Formation of subwavelength periodic structures on tungsten induced by ultrashort laser pulses," Opt. Lett. 32, 1932-1934 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-13-1932
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