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Acousto-optic programmable dispersive filter
An acousto-optic programmable dispersive filter (AOPDF) is a special type of collinear-beam acousto-optic modulator capable of shaping spectral phase and amplitude of ultrashort laser pulses. AOPDF was invented by Pierre Tournois. Typically, quartz crystals are used for the fabrication of the AOPDFs operating in the UV spectral domain, paratellurite crystals are used in the visible and the NIR (up to 4 µm) and calomel in the MIR (3-20 µm). The AOPDF is also used for the active control of the carrier-envelope phase of the few-cycle optical pulses and as a part of pulse-measurement schemes. Although sharing a lot in principle of operation with an ''acousto-optic tunable filter'', the AOPDF should not be mixed with it, since the in the former the tunable parameter is the transfer function and in the latter it is the impulse response
==Theory of operation==
Traveling acoustic wave induces variations in optical properties thus forming a dynamic volume grating.
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