Frequency combs: on-chip integration on track

EPFL scientists have found a way to miniaturize frequency combs, realizing a new step toward miniaturization of such tools. Their device can measure light oscillations with a precision of 12 digits. A compact, precision tool for counting and tracking laser frequencies may improve atomic clocks and optical data transmission devices. However, light waves oscillate hundreds of trillions of times per second, a frequency that is impossible to measure directly. Large pulsed laser sources are typically used to produce 'frequency combs' that can link the optical domain to the radio frequencies and make counting the oscillations of light possible. EPFL scientists have found a way to miniaturize frequency combs, realizing a new step toward miniaturization of such tools. Their device was capable of measuring light oscillations with a precision of 12 digits.