2002

Femtosecond Laser Micromachining: Applications in Technology and Biology, at Physics Colloquium, UMass Lowell (Lowell, MA), Wednesday, October 30, 2002:
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
Micromachining and laser processing with ultrashort laser pulses, at Modern Optics Center Lecture, Zhejiang University (Hangzhou, China), Thursday, October 17, 2002:
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 Micromachining and laser processing with ultrashort laser pulses
Understanding or Memorization: Are we teaching the right thing?, at University-wide lecture, Zhejiang University (Hangzhou, China), Thursday, October 17, 2002:
Education is more than just transfer of information, yet that is what is mostly done in large introductory courses -- instructors present material (even though this material might be readily available in printed form) and for students the main purpose of lectures is to take down as many notes as they can. Few students have the ability, motivation, and discipline to synthesize all the information delivered to them. Yet synthesis is perhaps the most important -- and most elusive -- aspect of education. Students get frustrated because they are unable to grasp simple concepts. Instructors get... Read more about Understanding or Memorization: Are we teaching the right thing?
Femtosecond laser-assisted microstructuring of silicon for novel detector, sensing, and display technologies, at State Key Laboratory for Silicon Material Lecture, Zhejiang University (Hangzhou, China), Thursday, October 17, 2002:
Arrays of sharp, conical microstructures are obtained by texturing the surface of a silicon wafer using femtosecond laser-assisted chemical etching. The one step, maskless texturing process drastically changes the optical and electronic properties of the original silicon wafer. These properties make the textured silicon viable for use in a wide range of commercial devices. Near-unity absorption of light, from visible to infrared wavelengths, offer opportunities for use in optically active devices such as solar cells and detectors. Significant enhancement of below-band-gap photocurrent... Read more about Femtosecond laser-assisted microstructuring of silicon for novel detector, sensing, and display technologies
Femtosecond laser-assisted microstructuring of silicon surfaces for novel detector, sensing, and display technologies, at Department of Physics Seminar, Fudan University (Shanghai, China), Wednesday, October 16, 2002:
Arrays of sharp, conical microstructures are obtained by texturing the surface of a silicon wafer using femtosecond laser-assisted chemical etching. The one step, maskless texturing process drastically changes the optical and electronic properties of the original silicon wafer. These properties make the textured silicon viable for use in a wide range of commercial devices. Near-unity absorption of light, from visible to infrared wavelengths, offer opportunities for use in optically active devices such as solar cells and detectors. Significant enhancement of below-band-gap photocurrent... Read more about Femtosecond laser-assisted microstructuring of silicon surfaces for novel detector, sensing, and display technologies
Femtosecond laser micromachining of transparent materials for photonics and biology, at International Symposium on Photonic Glasses 2002 (Shanghai, China), Tuesday, October 15, 2002:
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 of transparent materials for photonics and biology
Laser-assisted internal and surface microstructuring of materials, at Army Research Office Workshop on Relativistic and Sub-Relativistic Intensity: Physics and Applications, University of Michigan (Ann Arbor, MI), Sunday, September 29, 2002:
The study of laser-induced damage and breakdown of materials is nearly as old as the laser itself. Ranging from investigation of the interaction of lasers with materials to avoid damage to purposefully using the laser as a precise tool to impart damage. This talk presents the research ongoing in our laboratory towards fundamental understanding of damage mechanisms and novel applications of microstructuring processes using femtosecond laser pulses. Three experiments are presented: the use of femtosecond laser pulses in the processing of transparent materials such as glass or diamond, pump-... Read more about Laser-assisted internal and surface microstructuring of materials

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