Colorado School of Mines
Office for Technology Transfer
Spatially Chirped Pulses for Femtosecond Laser Ablation through
Transparent Materials
Daniel Adams, Dawn Vitek, David Kleinfled, Charles Durfee, and Jeffery Squier
Summary: A method for micromachining high aspect ratio features in thick media using
temporal focusing of spatially chirped femtosecond laser pulses
Description: Micromachining with femtosecond laser pulses is a powerful technique to cut
chemically inert media. This procedure uniquely facilitates the prototyping of three-dimensional
microanalytical devices with sub-diffraction limited features. However, single-step processing
has been limited in the size and aspect ratio of the features that can reasonable be produced in
these media. This invention discloses a method for cutting high aspect ratio features in thick
media using temporal focusing of spatially chirped femtosecond laser pulses that overcomes the
size and aspect ratio limitations of current commercial methods. Simultaneous spatial and
temporal focusing reduces nonlinear interactions, such as self-focusing, prior to the focal plane
so that deep (~1mm) features with parallel sidewalls are ablated at high material removal rates.
Potential Areas of Application
 Micromachining
 Laser Surgery
Main Advantages of this Invention
 Can machine thick samples
 Produces high aspect ratio
features with parallel walls
 High ablation rates
Intellectual Property Status:
US 8,669,488
ID number: 10011
Opportunity: We are seeking an exclusive or non-exclusive licensee for marketing,
manufacturing, and sale of this technology.
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Contact: William Vaughan, Director of Technology Transfer
Colorado School of Mines, 1500 Illinois Street, Guggenheim Hall Suite 314, Golden, CO 80401
Phone: 303-384.2555; e-mail: wvaughan@mines.edu