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Tyson Kim

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Proceedings Article | 10 June 2004 Paper

Micromachining of bulk transparent materials using nanojoule femtosecond laser pulses (Abstract Only)

Chris Schaffer, Tyson Kim, Jose Garcia, Eric Mazur, Alexander Groisman, David Kleinfeld

Proceedings Volume 5273, (2004) https://doi.org/10.1117/12.525443

KEYWORDS: Femtosecond phenomena, Micromachining, Objectives, Pulsed laser operation, Physics, Oscillators, Glasses, Lanthanum, Laser applications, Waveguides

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Femtosecond lasers are very effective tools for three-dimensional micromachining of transparent materials. Nonlinear absorption of tightly focused femtosecond laser pulses allows energy to be deposited in a micrometer-sized volume in the bulk of the sample. If enough energy is deposited, localized changes in the material are produced (a change in refractive index, for example). These localized changes are the building blocks from which three-dimensional structures can be produced. With sufficiently tight focusing, the threshold for producing these changes can be achieved with pulse energies that are available directly from laser oscillators, offering greatly increased machining speeds and simpler, cheaper technology compared to using amplified lasers. In addition, the inter-pulse spacing from a laser oscillator is much shorter than the time required for energy deposited by one pulse to diffuse out of the focal volume. As a result, irradiation with multiple pluses on one spot in the sample leads to an accumulation of heat around the focal region. This localized heating provides another mechanism by which material properties can be altered. We demonstrate the three-dimensional fabrication of optical waveguides and microfluidic channels using pulse energies of only a few nanojoules to tens of nanojoules.

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