Download Design and Fabrication of Acousto-optic Devices (Optical by Goutzoulis PDF
This paintings deals specified discussions on all points of acousto-optic deflectors, modulators and tunable filters, emphasizing hands-on systems for layout, fabrication and trying out. It includes formerly unpublished remedies of acousto-optic gadget layout and impedance matching, allowing the particular layout of actual units and device-matching circuits.
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Extra info for Design and Fabrication of Acousto-optic Devices (Optical Science and Engineering)
This advantage is similar to the advantage gained by the use of an optical blazed grating which concentrates the diffracted light in a single order. The disadvantage lies in the difficulty of its fabrication, especially at high frequencies (>1 GHz) where A/2 is a few micrometers for most common A 0 materials. Most of the stepped arrays reported to date have 2-10 elements . One of the highest-frequency stepped array transducers ever reported  is the N = 3 element array fabricated on PbMoO,, which exhibited a 3-dB bandwidth of 250 MHz covering the 140- 42 KLUDZIN AND GOUTZOULIS 390 MHz frequency range, with a diffraction efficiency of 8%/100 mW.
This gives rise [l31 to a different figure of merit, MI, which is used when the efficiency-bandwidth performance an A 0 device is of interest. , H = V/Af. 7 Wave vector diagramfor isotropic Bragg diffraction showing wideband operation by using a transducer with angular acoustic beam spreadof GOUTZOULIS AND KLUDZIN Anisotropic A 0 interactions takeplace in optically anisotropic crystals and involve diffraction between ordinary and extraordinray optical beams. these beams face different refractive indices, this type of A 0 interaction is often called birefringent and involves rotation of the polarization of the diffracted beam by 90" with respect to that of the incident beam.
By choosing the two frequencies properly, we can maximize the bandwidth at the expense of a midband dip. In general, the double-peak approach results in maximum bandwidth and is most often used for wideband deflectors. The advantage of the double-peaked approach depends on the crystal characteristics and the device design. For example, Hecht [l91 using the double-peak approach with a 3-dB midbanddip, has demonstrated a bandwidth increase of about 35% over that of the single-peak approach. 7 GHz, also at A = 633 nm.