Dr. Lionel William John Kent Profile

Dr. Lionel William John Kent

at BAE Systems

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Proceedings Article | 6 October 2017 Paper

Underwater Wireless Acousto-Optic Waveguide (UWAOW)

Giovanni Giuliano, Lionel W. Kent, Leslie Laycock

Proceedings Volume 10437, 1043708 (2017) https://doi.org/10.1117/12.2286318

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The present study originated in the lack of research into achieving underwater total internal reflection (TIR) via the acousto-optic effect. The uniqueness of this technique exists in the fact that it is based on a high sound pressure level which induces a localised change in refractive index of seawater sufficient to achieve total internal reflection within the communication channel. Different transducer systems for generating the pressure wave have been investigated and take the form of a wave which may be either a standing wave, or a novel beamforming technique. The former is based on an array of transducers and with an acoustic mirror at the receiver in order to establish the standing wave. The alternative approach relies on the high intrinsic directionality of a novel beamformer where an annular transducer array is examined as an acoustic source. In this paper, the main characteristics of the acoustic optic waveguide will be presented. This will include both sound and light propagation in the ocean, TIR, novel beam propagation, the refractive index of water as a function of the externally applied acoustic pressure, and the acoustic technology. The modelled results, the limitations imposed by the challenging medium, and the system requirements required to obtain an Underwater Wireless Acousto-Optic Waveguide (UWAOW) will be also addressed.

Proceedings Article | 27 September 2008 Paper

3 GHz bandwidth rutile Bragg cell

L. W. Kent

Proceedings Volume 7100, 710027 (2008) https://doi.org/10.1117/12.803620

KEYWORDS: Acousto-optics, Bragg cells, Acoustics, Transducers, Crystals, Signal attenuation, Diffraction, Polarization, Lithium niobate, Phase modulation

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We report the development of a 3GHz bandwidth Bragg cell designed for operation at 488nm with a peak optical diffraction efficiency of 2.3%/RF Watt. This device has the highest bandwidth ever reported for an optical polarisation switching Bragg cell. The device is manufactured using an optically rotated cut of single crystal rutile (TiO₂). Three prototype devices have been built and each have an acousto-optic response centred on ~5GHz that is flat to better than 3dB. Excellent electrical match to the device transducer has been demonstrated on all three devices. The best device had a VSWR of 2:1 over a bandwidth of 5.55GHz centred on 5.15GHz. These new devices exhibit low acoustic attenuation across the optical aperture and also have low optical scatter. They will permit the development of ultra-wide band acousto-optic spectrometers.

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