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An AOTF is a solid-state, electronically
tunable bandpass filter, which uses the acousto-optic
interaction inside an anisotropic medium. These filters
can be used with multi-lines sources (mixed gas lasers,
Laser diodes...) or with broadband light sources (Xenon,
Halogen lamps...). They allow to select and transmit
a single wavelength from incoming light. The RF frequency
applied to the AOTF transducer controls the transmitted
(filtered in 1st order) wavelength. A complete spectrum
analysis can be done by varying the frequency corresponding
to the wavelength range. The RF amplitude level applied
on the transducer allows to adjust the transmitted (filtered)
light intensity level. This is a unique feature that
can provide the AOTF. It is fast(several §Á), accurate
and procures high extinction ratio. Main application
: spectroscopic analysis (fluorescence, transmission...),
laser show.
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