If you have a spare $1500 burning a hole in your pocket, perhaps you'd like to spend it on an ultra-precise, ultra-small atomic clock, now available for purchase from Symmetricom Inc. Draper Laboratory and Sandia National Laboratories.
The Chip Scale Atomic Clock (CSAC), originally developed for DARPA, is 100 times smaller than its predecessors and uses 100 times less power as well. It requires only 100 milliwatts of power, measures about 1.5 inches per side and is less than half an inch deep.
The clock measures the passage of time in millionths of a second by counting the frequency of electromagnetic waves. These waves are emitted by cesium atoms are stored in a tiny container, no bigger than a grain of rice, when they are shot by a vertical-cavity surface-emitting laser (VCSEL). Replacing the previously used rubidium-based atomic vapor lamp with the VCSEL is what reduced the clock's power consumption.
After 10 years of development, CSAC went on the market in January. DARPA projects rarely become commercialized, so this product page, available for anyone to peruse on the web (and purchase for their deep-sea explorations), is a pretty big deal.
Atomic clock ☑
Laser ring gyro ☑
Soon I will have indoor inertial nave
That is great! As I am running web version of an atomic clock www.thetimenow.com this would be something that I would purchase actually. But $1500 is a bit steep I think.