Tech Briefs Magazine - January 2024 - PIT-10
Fiber Optics
the way towards generating mid-infrared
lasers free from any moving mechanical
parts, " said Professor Février.
Based on experimental data, the researchers'
ultra-fast mid-infrared lasers
are about 1,000 times more powerful
than those produced by existing methods
that use optical fibers with solid
cores. The lasers should be many orders
of magnitude more powerful - potentially
a million times - than the mid-infrared
light currently used in handheld devices
for detecting hazardous substances. Due
to their low-powered mid-infrared light,
these portable devices cannot detect substances
more than 100 meters away.
" With a high-intensity laser, we can
achieve high sensitivity and potentially
use the laser in devices to safely detect
even very small amounts of a substance
that lasers or light produced from existing
methods will have trouble with, " said
Professor Chang.
The scientists' method for producing
3-4 micrometer mid-infrared lasers
opens the way for developing more accurate
and precise sensors for keeping tabs
on the environment for pollutants and
possibly for health monitoring.
In the future, the scientists plan to do
further research to produce mid-infrared
lasers with longer wavelengths that
are even brighter.
50μm
A scanning electron microscope photo of the
cross-section of a hollow-core fiber used in NTU
Singapore's mid-infrared laser experiments. A
ring of seven smaller tubes can be seen along the
inner wall of the fiber core.
Their lasers could be used to help
identify greenhouse gases like methane
that absorb mid-infrared radiation in this
range well. And since methane found
in a person's breath has been linked to
colorectal cancer, the lasers could also
offer a way to monitor people's health
through breath analysis.
Professor Chang believes his method
could, in theory, produce mid-infrared
lasers of up to 10 micrometers.
Such lasers would widen the range
of substances that could be identified,
including chemicals like formaldehyde
that can leak in industrial workplace accidents
and hazardous substances like
TNT explosives, which absorb mid-infrared
radiation with wavelengths of
around 6 micrometers and 8 micrometers,
respectively.
Professor Février said that if the
wavelength spectrum of the lasers
generated can be broadened up to 10
micrometers, " among the various possibilities,
it is clear that the NTU team's
novel light source can be used to detect
possibly hazardous compounds in
the air. "
This article was written by Kenny
Chee, Assistant Director, Nanyang Technological
University Singapore. For
more information, visit ntu.edu.sg.
http://ntu.edu.sg
http://info.hotims.com/86251-721
Tech Briefs Magazine - January 2024
Table of Contents for the Digital Edition of Tech Briefs Magazine - January 2024
Tech Briefs Magazine - January 2024 - Intro
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