Femtosecond laser microfabrication

Femtosecond Laser Micromachining: Applications in Photonics and Biology, at Modern Optics and Spectroscopy Seminar, MIT (Cambridge, MA), Tuesday, March 11, 2003:
When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside living cells. In this talk I will review recent results obtained in the... Read more about Femtosecond Laser Micromachining: Applications in Photonics and Biology
Femtosecond Laser Micromachining: Applications in Technology and Biology, at 2005 SPIE Photonics West Conference, Symposium OE04: Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX (San Jose, CA), Wednesday, January 26, 2005:
When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells. In this talk we will review recent results obtained in... Read more about Femtosecond Laser Micromachining: Applications in Technology and Biology
Femtosecond laser micromachining, at 1st International Workshop on Multiphoton Processes in Glass and Glassy Materials, University of Sydney (Sydney, Australia), Monday, December 11, 2006:
When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells.
Femtosecond laser nanofabrication of metal structures through multiphoton photoreduction, at Photonics West (San Francisco, CA), Tuesday, January 25, 2011:
We present an ultrafast laser technique for direct-writing gold and silver structures of tunable dimensions. By utilizing nonlinear optical interactions between chemical precursors and femtosecond pulses, we limit metal-ion photoreduction processes to focused spots smaller than that of the diffraction-limit. This creates metal nanostructures in a focal volume that can be rapidly scanned in 3D. By varying the solution chemistry and laser pulse parameters, we demonstrate morphological control of the resulting structures. We fabricate grid and woodpile patterns over hundreds of micrometers in... Read more about Femtosecond laser nanofabrication of metal structures through multiphoton photoreduction
Femtosecond micromachining of waveguides in a Faraday material, at Photonics West 2006 (San Jose, CA), Tuesday, January 24, 2006
The use of femtosecond lasers for micromachining purposes has grown significantly over the past decade. Femtosecond micromachining of photonic devices has been demonstrated using only a few nanojoules of energy from a laser oscillator. This oscillator-only technique has recently become increasingly valuable as a micromachining tool.

Faraday isolators have not yet been realized using this ultrafast micromachining technique. A Faraday isolator is an important device because it functions as an optical diode, allowing signals to propagate only in one direction. It is particularly useful in...

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Applications of femtosecond lasers in materials processing, at Cursus sur les sciences des materiaux et surfaces actives, Ecole Supérieure de Physique et Chimie (Paris, France), Tuesday, February 9, 2010:
Chemical bonding, phase transitions, and surface processes occur on timescales comparable to the natural oscillation periods of atoms and molecules, in the range of femtoseconds (1 fs =10–15 s) to picoseconds (1 ps = 10–12 s). Advances in the generation of ultrashort laser pulses in the past two decades have made it possible to directly observe these fundamental processes. These advances have taken us from the picosecond timescale a generation ago, to the femtosecond timescale in the past decade, and recently into the attosecond (1 as = 10–18 s) regime. Materials science, interdisciplinary by... Read more about Applications of femtosecond lasers in materials processing

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