%0 Conference Paper %D 2000 %T Micromachining optical waveguides in bulk glass using a femtosecond laser oscillator %A Schaffer, C. B. %A A. Brodeur %A J. F. Garcia %A W. A. Leight %A Mazur, E. %K CA %K San Francisco %X Using tightly-focused femtosecond laser pulses of only a few nanojoules we produce optical breakdown and damage in bulk transparent materials, enabling micromachining using unamplified lasers. As a demonstration, we fabricate single-mode optical waveguides inside bulk glass. %I Conference on Lasers and Electro Optics (CLEO) %G eng