James A. Thomas's research while affiliated with University of California, San Diego and other places
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Publications (5)
this paper is as follows. In Section 2 we present a brief review of earlier optical phasedarray systems and discuss the addressing techniques used in these systems. The majority of this paper then deals with presenting a Fourier based theoretical analysis of cascaded optical phased-array deflectors and associated experiments with PLZT-based phased-...
Optical phased arrays can provide a versatile means for fast,
solid-state, random-access beam steering. This dissertation presents
both the theory of phased array beam deflection and the experimental
development of a high speed optical phased array based on Lead Lanthanum
Zirconate Titanate (PLZT), a fast switching transparent electrooptic
ceramic....
A novel type of electro-optic diffractive element is presented which can
satisfy the requirements for a high space-time bandwidth deflector while
providing for two-dimensional random access beam steering control. The
basic device consists of a multichannel array of phase modulators
fabricated using Lanthanum-modified lead zirconate titanate (PLZT)...
Multichannel arrays of phase modulators are attractive as fast, high resolution random-access beam deflectors and can find direct application to such areas as projection display and programmable optical interconnects. Because of their similarity to a stepped-phase diffractive optical element (DOE) we call these devices programmable DOEs. Several fo...
We introduce a programmable diffractive optical element based on an electro-optic phased array implemented with a multichannel lanthanum-modified lead zirconate titanate phase modulator. The design and fabrication procedures are outlined, along with an experimental demonstration of the device. Experimental results from a 16-channel device operating...
Citations
... 4 Recently there have been several nonmechanical beam-steering devices developed by different research groups. [5][6][7][8][9][10][11] With its low driving voltage and mature low-cost fabrication technology, liquid-crystal LC technology seems to be an excellent candidate for beam-steering devices. The effort in the development of LC beam deflectors can be traced back to the early 1970's. ...
Reference: Liquid-Crystal Blazed-Grating Beam Deflector
... Comparing with active OPA, passive OPA does not have any other heat deposition, such as quantum loss, nonradiation jump, and Joule heat. Since the promotion on the concept of OPA, there have been at least three methods to realize it [3,8,9]: LiNbO3, PLZT, and liquid crystal (LC). Therein, the OPA using nematic LC usually called liquid crystal optically phased array (LC-OPA) has a great potential to achieve practical OPA system for steering optical laser beam inertia less, nonmechanical, and low SWaP (Size Weight and Power consumption). ...
... The most important part of controlling beam steering in the principle of one-dimensional OPA is the equal phase difference between each adjacent element when the light exits the array. Its theory is clearly described in the Ref 30 . The purpose of the cascaded-PPLN waveguide designed in this paper is to construct an equal phase difference (∆ϕ) distribution between each adjacent array element, based on electro-optical effect of LN. ...
