Bragg cell

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Bragg cell

[′brag ‚sel]
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"We are delighted that our acousto-optic modulator was selected by NASA for this important mission," said Dr.
In order to avoid the directional ambiguity in frequency shift, the most common solution is the heterodyne interferometer where an optical frequency shift is introduced into one arm of the interferometer by an acousto-optic modulator (AOM) to obtain a virtual velocity offset.
Bove and his team have instead developed a very high-bandwidth light modulator, a guided-wave acousto-optic modulator, which is a slab of lithium niobate treated to create a sub-surface waveguide, sandwiched between two sets of piezoelectric aluminium transducers.