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Category : Communication equipment (transmission, RF, test and control instruments) > RF communication equipment
Frequency shifters
A frequency shifter uses the shift inherent in the acousto-optic interaction to up- or down-shift a laser’s frequency. Two kinds of shifters can be distinguished: the fixed frequency shifter, and the variable frequency shifter. The frequency shift is directly equal to the RF frequency applied onto the transducer (we must not forget that the out put angle is also linked to the frequency : see deflectors).
Various techniques can be used to shift the laser beam, such as multiple travels inside the shifter to double or triple the frequency shift, or a combination of two frequency shifters to achieve low amount of shift (DC to KHz).
These devices can be used, for example, in optical heterodyning and interferometric applications, or in laser Doppler velocimetry for particle velocity analysis in sprays.
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- Tunable filters
- Acousto-optic modulators used to control laser beam intensity
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of all articles in this sub-category RF communication equipment
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