It's not at every university that laser pulses powerful enough to burn paper and skin are sent blazing down a hallway. But that’s what happened in UMD’s Energy Research Facility, an unremarkable looking building on the northeast corner of campus. If you visit the utilitarian white and gray hall now,
A laser is sent down a UMD hallway in an experiment to corral light as it makes a 45-meter journey. Credit: Intense Laser-Matter Interactions Lab, UMD
Left to right: Eric Rosenthal, a physicist at the U.S. Naval Research Laboratory; Anthony Valenzuela, a physicist at the U.S. Army Research Lab; and Andrew Goffin, a UMD electrical and computer engineering graduate student, align optics at a porthole in the wall in order to send the laser beam from the lab down the hallway. Credit: Intense Laser-Matter Interactions Lab, UMD
Distributions of the laser light collected after the hallway journey without a waveguide and with a waveguide . Credit: Intense Laser-Matter Interactions Lab, UMD Milchberg’s potential solution to this challenge of keeping light confined is additional light—in the form of ultra-short laser pulses. This project built onin which his lab demonstrated that they could use such laser pulses to sculpt waveguides in the air.
The researchers showed that the technique could extend the length of the air waveguide, increasing the power they could deliver to a target at the end of the hallway. At the conclusion of the laser’s journey, the waveguide had kept about 20% of the light that otherwise would have been lost from their target area. The distance was about 60 times farther than their record from previous experiments.
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