Physical Sciences
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A Ka-band radar is discussed for mapping surface topography of glaciers and ice sheets at a high spatial resolution and high vertical accuracy, independent of cloud cover.
We describe a nuclear spin gyroscope based on an alkali-metal–noble-gas co-magnetometer. An
optically pumped alkali-metal vapor is used to polarize the noble gas atoms and detect their gyroscopic precession.
The conversion efficiency can be optimized if
instead of a short segment, the entire length of the optical resonator also
carries the THz radiation. This is achieved by exciting a THz whispering
gallery mode, in addition to the optical ones.
This is a full-field, real-time, noncontact optical technique
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