Electronic Products & Technology

Chip scale atomic clock uses a laser to induce quantum transitions

November 27, 2020  Stephen Law

IQD ICPT-1 chip scale atomic clock (CSAC) uses the Coherent Population Trap (CPT) method to obtain a stable frequency. While common rubidium oscillators detect the atomic transition with the help of a rubidium discharge lamp (Rb lamp), device uses a laser to induce quantum transitions. A major advantage of the laser is a much lower power consumption. Additionally, the life cycle of a Rb lamp is very limited – typically around 10-years – whereby the laser has a much longer life expectancy. Housed in a 36.0 x 45.0 x 14.5mm package, device is smaller compared to traditional rubidium oscillators and comes with a current consumption of only 500mA @ 3.3V typically. With its frequency tolerance of 0.05ppb, its short term stability of 0.09ppb @ Tau = 1 s and its ageing of only 0.03ppb per day this product is comparable to common standard Rubidium products.

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