The new strategy expands the application of ultra-fast, highly efficient laser pulses.
Currently, fast, gentle flare lasers, lasting less than a trillionth of a second, are used in a wide range of functions. These ultra-short laser pulses have allowed scientists to view chemical reactions in real time, image sophisticated organic samples, build precise nanostructures, and transmit high-speed optical communications high bit rate, long distance.
Any soft laser pulses in the visible spectrum, however, have to overcome one fundamental problem – crimson migrates earlier than blue thanks to glass-like transparent supplies. . So when an ultra-short laser pulse passes through the glass lens, the tightly packed wavelengths of sunlight separate, destroying the usefulness of the beam.
This disadvantage of color dispersion has baffled optical researchers for many years. Today, most options contain additional components that enhance the scale and bulk of optical devices.
Now, researchers at the Harvard John A. Paulson College of Engineering and Applied Sciences (SEAS), in collaboration with Graz College of Professionals, have developed a silicone coating that, when used for the floors of Glass lens, can resist the result of dispersion.
The analysis was revealed in Nature Communications.
Scanning electron microscope image of the compressor with a 158 nm nanopillar diameter. Credit Score: Harvard SEAS
“Our versatile strategy can be quickly applied in standard optics and optical setups and tailored to completely different spectral functions and regions,” said Federico Capasso, Robert Wallace Professor of Applied Physics and Vinton Hayes Senior Analyst in Electrical Engineering at SEAS and senior. research creator.
The ultra-thin coating uses precision-engineered silicone posts that briefly tighten and maintain a gentle crimson color earlier than replay. This temporary hold allows the slower-moving blue to catch up.
“Our coating resists the dispersion of a clear supply, acting as a boost,” said Marcus Ossiander, a postdoctoral analyst at SEAS and the first author of the paper. speed gives a gentle crimson color and averages the speed of all wavelengths of sunlight.
The researchers tested the coating by shortening the laser pulse to just a couple of quarters of a second. Nanopillar silicon coatings are created using the same business lithography tools as industrial semiconductors, making it easy to quickly apply these coatings to existing and developed optical components. applicability of femtosecond laser pulses.
“Now, anyone should buy a lens, put the coating on, and use the lens without worrying about dispersion,” says Ossiander. “This strategy could be the idea for a range of anti- or non-dispersive optics.”
Reference: “Gradually gentle nanocoating for ultrashort pulse compression” by M. Ossiander, Y.-W. Huang, WT Chen, Z. Wang, X. Yin, YA Ibrahim, M. Schultze and F. Capasso, November 11, 2021, Nature Communications.
DOI: 10.1038 / s41467-021-26920-6
The analysis was co-authored by YW Huang, WT Chen, Z. Wang, X. Yin, YA Ibrahim and M. Schultze. It is partially supported by the Workplace of Naval Analysis (ONR), under the MURI program, level zero. N00014-20-1-2450, Agency for the Analysis of Air Energy Science (AFOSR), below level zero. FA95550-19-1-0135 and Center for Nanoscale Engineering (CNS), a member of the National Nanotechnology Coordination Infrastructure (NNCI), is supported by NSF by award no. ECCS-2025158.
