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Beam steeringphased array

Optical phased arrays (OPAs) are devices that use the coherence of light to control the interference pattern in the far field, which enables them to steer a laser beam with no moving parts. As such, OPAs have potential applications in laser communications, target acquisition and tracking, metrology, and directed energy. In this Letter, we present a control architecture for an actively phase-locked OPA, capable of steering a laser beam at speeds limited by the actuation bandwidth of electro-optic modulators. The system achieved an output phase stability of $\lambda /770$ and steering speeds up to 1 MHz. The digital control architecture can be extended to GHz steering speeds, is readily scalable to hundreds of emitters, and is compatible with high-power arrays.

The lowest power objective should be in place for ... unplug it, wrap the cord around the ocular lenses, and put ... Focus the specimen using the 10x objective and ...

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Beam steeringultrasound

1Centre for Gravitational Astrophysics, Research School of Physics, The Australian National University, Canberra ACT 260, Australia

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3ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Research School of Physics, The Australian National University, Canberra ACT 260, Australia

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2ARC Centre of Excellence for Engineered Quantum Systems (EQUS), Research School of Physics, The Australian National University, Canberra ACT 260, Australia

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David R. Gozzard, James T. Spollard, Paul G. Sibley, Lyle E. Roberts, and Daniel A. Shaddock OSA Continuum 3(12) 3399-3406 (2020)

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Opticalbeam steering

Steering Beamof a car

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Optical phased arrays (OPAs) are devices that use the coherence of light to control the interference pattern in the far field, which enables them to steer a laser beam with no moving parts. As such, OPAs have potential applications in laser communications, target acquisition and tracking, metrology, and directed energy. In this Letter, we present a control architecture for an actively phase-locked OPA, capable of steering a laser beam at speeds limited by the actuation bandwidth of electro-optic modulators. The system achieved an output phase stability of $\lambda /770$ and steering speeds up to 1 MHz. The digital control architecture can be extended to GHz steering speeds, is readily scalable to hundreds of emitters, and is compatible with high-power arrays.

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Jason Midkiff, Kyoung Min Yoo, Jong-Dug Shin, Hamed Dalir, Mohammad Teimourpour, and Ray T. Chen Optica 7(11) 1544-1547 (2020)