Journal ArticleDOI
Numerical aperture dependence of damage and supercontinuum generation from femtosecond laser pulses in bulk fused silica
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In this article, the authors measured the threshold energy for supercontinuum generation and bulk damage in fused silica using numerical apertures (NAs) ranging from 0.01 to 0.65.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 0.05NA 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.read more
Citations
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Journal ArticleDOI
Femtosecond laser micromachining in transparent materials
Rafael R. Gattass,Eric Mazur +1 more
TL;DR: In this article, the physical mechanisms and the main experimental parameters involved in femtosecond laser micromachining of transparent materials, and important emerging applications of the technology are described.
Journal ArticleDOI
Femtosecond continuum generation in bulk laser host materials with sub-μJ pump pulses
TL;DR: In this article, a comprehensive investigation of femtosecond continuum generation in single crystals of several common laser host materials is presented, including yttrium aluminum garnet (YAG), vanadate (YVO4), gadolinium vanadates (GdVO4) and potassium-gadolinium tungstate (KGW) thresholds below 50 nJ, plateau-like visible and infrared spectra and higher infrared photon flux as compared to conventional materials like sapphire.
Journal ArticleDOI
Sub-50 fs broadband absorption spectroscopy with tunable excitation: putting the analysis of ultrafast molecular dynamics on solid ground
TL;DR: In this article, the authors describe a femtosecond transient spectrometer with a full description of a state-of-the-art femto-cond transducer.
Journal ArticleDOI
Femtosecond laser induced phenomena in transparent solid materials: Fundamentals and applications
TL;DR: In this paper, the authors present a critical overview of the current state of the art in studying femtosecond laser induced various phenomena in transparent materials, including their physical and chemical mechanisms, the applications and limitations as well as the future research trends.
Journal ArticleDOI
Ultrafast laser direct writing and nanostructuring in transparent materials
TL;DR: An overview of femtosecond laser writing in transparent materials is presented in this article, where the authors present an overview of recent achievements in the field of femto-cond light-matter interaction on the ultrashort time scale.
References
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Book
Fundamentals of Photonics
TL;DR: The Fundamentals of Photonics, Third Edition as discussed by the authors is a self-contained and up-to-date introductory-level textbook that thoroughly surveys this rapidly expanding area of engineering and applied physics.
Journal ArticleDOI
Photosensitivity in optical fiber waveguides: Application to reflection filter fabrication
TL;DR: In this paper, the observation of photosensitivity in Ge-doped core optical fibers is reported. The photosensitivity is manifested by light-induced refractive index changes in the core of the waveguide.
Journal ArticleDOI
Nanosecond-to-femtosecond laser-induced breakdown in dielectrics
Brent C. Stuart,Michael D. Feit,S. Herman,Alexander M. Rubenchik,Bruce W. Shore,Michael D. Perry +5 more
TL;DR: A decreasing threshold fluence is found associated with a gradual transition from the long-pulse, thermally dominated regime to an ablative regime dominated by collisional and multiphoton ionization, and plasma formation.
Journal ArticleDOI
Three-dimensional optical storage inside transparent materials.
Eli N. Glezer,Milos Milosavljevic,L. Huang,Richard J. Finlay,Tsing-Hua Her,J. P. Callan,Eric Mazur +6 more
TL;DR: A novel method for three-dimensional optical data storage that has submicrometer size resolution, provides a large contrast in index of refraction, and is applicable to a wide range of transparent materials is presented.