Like a vocal coach who extends the octave range of an opera singer, researchers at the National Institute of Standards and Technology (NIST) have expanded by nearly two-thirds the frequency range over which a chip-scale device can generate and measure the oscillations of light waves with exquisite accuracy. The expanded range of the system, known as a microring resonator frequency comb, or microcomb, could lead to better sensors of greenhouse gases and may also improve global navigation systems.
Click here for original story, Scientists greatly expand the frequencies generated by a miniature optical ruler
Source: Phys.org