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| Most atomic clocks are bench-bound. Even rubidium clocks are referred to only as “man-portable” and can weigh in excess of 2 to 10 pounds. In contrast, this cesium laser atomic clock can be constructed using photoresist MEMS (micro-electro-mechanical system) technology; here the glass cell measures about 1 cubic centimeter and it operates using only about tens of milliwatts of electricity. Backed by a portfolio of basic patents, the technology can bring timing at atomic clock accuracy (1 part in 10^12) to applications such as GPS, frequency hopping for security, and communication channel density. The clock IP portfolio describes an all-digital system created using semiconductor manufacturing techniques. By using a cesium cell, a laser diode, and a photo diode, the system requires no volume resonator to control the frequency of laser light. In the lab, the clock has demonstrated high stablility, approximately 1 part in 10^12 over 1000 seconds, or about 10 times better stability than other miniature coherent population (CPT) clocks. The photograph above shows the relative size of the complete physics package (on top of a US quarter coin) as well as an insert showing the relative size of a cesium cell, allowing the construction of relatively small and accurate clocks using RF interrogation methods.Modern military aerospace communications systems often extremely stable accurate timing devices overall weight ruggedness considerations Atomic frequency standards time applications atomic bulky component construction cost all-MEMS clock fabricated monolithic microchip expected maintain accuracy 1/2 second year far less Yet goal liter essentially rubidium |
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