Laser frequency combs—high-precision tools for measuring different colors of light in an ever-growing range of applications such as advanced atomic clocks, medical diagnostics and astronomy—are not only getting smaller but also much easier to make.
Physicists at the National Institute of Standards and Technology (NIST) can now make the core of a miniature frequency comb in one minute.* Conventional microfabrication techniques, by contrast, may require hours, days or even weeks.
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