The Acousto-Optic Effect 13
Lab 9: The Acousto-Optic Effect
... EXERCISES 1-6 PERTAIN TO THE EXPER- IMENTAL SECTIONS. 2 Background An Acousto-Optics Modulator (AOM) is used to am- plitude modulate and shift the frequency of a laser beam. An AOM uses the interaction of ...
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A beamforming system based on the acousto-optic effect
... The acousto-optic beamformer is a beamforming sys- tem immune to spatial ...the acousto-optic beamformer cannot steer the looking direction of the system ...the acousto-optic ...
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Acousto-optic modulator
... the acousto-optic modulator. The ability of the acousto-optic modulator to shift the frequency of a laser light beam by a precise and stable amount is crucial to production of a beat note from ...
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Holographic reconstruction of sound fields based on the acousto-optic effect
... Using a laser Doppler vibrometer (LDV), it is possible to scan the sound field over an area and obtain the Radon transform of the sound pressure. From these data, the actual pressure in space domain can be retrieved via ...
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Development and characterization of an acousto-optic modulator
... AO effect did not occur until 1932 when two independent groups, Debye and Sears in ...AO effect can be used to control the frequency, intensity and direction of an optical ...AO effect provides a ...
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Ultrasound sensing using the acousto optic effect in polymer dispersed liquid crystals
... Piezoelectric generation of ultrasound is inevitably accompanied by heating of transduc- ers and this demands careful consideration. Heating effects were closely monitored using a “Titanium” thermal imaging camera from ...
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High frequency acousto optic effects in Bragg reflectors
... photoelastic effect is the dominant mechanism of reflectance modulation and only the fundamental l = 0 mode is ...photo-elastic effect and interface displacement become negligible when λ lies in the ...
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Laser beam modulation by an acousto optic mode locker
... a acousto optic modulator in the laser cavity near the output mirror and opening the modulator at a frequency, f = ...cavity. Acousto optic modulator operation is based on acousto ...
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Transmission Characteristic Simulation of High Frequency Acousto Optic Modulators
... of acousto-optics is describing the effect of light-sound interaction, which occurs because a sound wave induces localized refractive index variations in the medium through which it ...the effect is ...
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Acousto optic superlattice modulator using Fibre Bragg grating
... *Optoelectronics Group, School of Physics, University of Bath, Bath BA2 7AY, UK Abstract A modulator is reported in which an extensional acoustic wave is launched along a fiber Bragg grating. The ...
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Experimental set up for characterization of acousto-optic modulator system
... ABSTRACT Acousto-optic effect can be used in many useful devices such as modulators, switches, filters, frequency shifters and spectrum ...modulating effect was generated by low cost SF 6 ...
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Towards acousto-optic tissue imaging with nanosecond laser pulses
... generate acousto-optical signals in timovssue-like media with nanosecond laser ...the acousto-optic effect, ...in acousto-optics, and therefore brings in-vivo ...
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Holographic video display based on guided-wave acousto-optic devices
... this effect (and unlike in Mark II), the horizontal and vertical scans both appear to emanate from the same location and following opti- cal elements can remain spherical rather than needing to be separate ...
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Dynamic wavefront shaping with an acousto-optic lens for laser scanning microscopy
... apparent effect on the shape of focus, these effects are likely to result from variations in AOL transmission efficiency as previously noted for purely lateral scanning at planes above and below the natural focal ...
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Investigation of the influence of the scattering coefficient on acousto optic modulation efficiency in turbid phantoms
... To measure the effect of local scattering coefficient on acousto-optic modulation efficiency we used the experimental set-up shown in Fig. 2.3. The setup is based on a two phase homodyne detection ...
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Optical Bistability in an Acousto Optic Tunable Filter (AOTF) Operating with Short Optical Pulses
... It is also possible to observe in the same figure the range of the OB for the parameters chosen it is some- thing about 20 - 22.4 W for input power intensity. Figure 4 shows us that a change in just one of these ...
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The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling
... an effect on the retrieved profile due sensitivity to the scattering cross sections from the particle size distri- ...large effect on the retrieved ...
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Revisiting the laser frequency locking method using acousto-optic frequency modulation transfer spectroscopy
... deviation is restricted within þ0.9∕ − 0.7 MHz. The error bars in Fig. 7(b) indicate the STD of the short-term fre- quency fluctuations, which reflect the laser linewidth variation during frequency shifting. The locking ...
5
Two Element Phased Array Acousto Optic Deflector at High Diffraction Efficiency: Scanning Range Broadening
... 0.94 γ = we should expect not 4.5 times increase, but rather 2.1 times. The measured efficiency is plotted on fig. 5. Curve 1 was taken with no phase shift between the elements. At each frequency the powers of the ...
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A modeling-based assessment of acousto-optic sensing for monitoring high-intensity focused ultrasound lesion formation
... the experimental data from Lai et al. (2011), and possible causes of discrepancies between simulation and experimental results are discussed. Unless otherwise stated, the simulation medium for all of the results ...
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