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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 11 — Nov. 1, 2006
  • pp: 2317–2322

Numerical aperture dependence of damage and supercontinuum generation from femtosecond laser pulses in bulk fused silica

Jonathan B. Ashcom, Rafael R. Gattass, Chris B. Schaffer, and Eric Mazur  »View Author Affiliations


JOSA B, Vol. 23, Issue 11, pp. 2317-2322 (2006)
http://dx.doi.org/10.1364/JOSAB.23.002317


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Abstract

Competing nonlinear optical effects are involved in the interaction of femtosecond laser pulses with transparent dielectrics: supercontinuum generation and multiphoton-induced bulk damage. We measured the threshold energy for supercontinuum generation and bulk damage in fused silica using numerical apertures (NAs) ranging from 0.01 to 0.65. The threshold for supercontinuum generation exhibits a minimum near 0.05 NA and increases quickly above 0.1 NA. For NAs greater than 0.25, we observe no supercontinuum generation. The extent of the blue broadening of the supercontinuum spectrum decreases significantly as the NA is increased from 0.01 to 0.08, showing that weak focusing is important for generating the broadest supercontinuum spectrum. Using a light-scattering technique to detect the onset of bulk damage, we confirmed bulk damage at all NAs studied. At a high NA, the damage threshold is well below the critical power for self-focusing.

© 2006 Optical Society of America

OCIS Codes
(140.3440) Lasers and laser optics : Laser-induced breakdown
(160.6030) Materials : Silica
(260.5950) Physical optics : Self-focusing
(320.2250) Ultrafast optics : Femtosecond phenomena

ToC Category:
Materials

History
Original Manuscript: January 13, 2006
Revised Manuscript: July 18, 2006
Manuscript Accepted: July 23, 2006

Citation
Jonathan B. Ashcom, Rafael R. Gattass, Chris B. Schaffer, and Eric Mazur, "Numerical aperture dependence of damage and supercontinuum generation from femtosecond laser pulses in bulk fused silica," J. Opt. Soc. Am. B 23, 2317-2322 (2006)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-23-11-2317

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