Proceedings of SPIE - The International Society for Optical Engineering
... studies of system performance and adaptive optics design parameters. Author(s): Robert K. Tys... more ... studies of system performance and adaptive optics design parameters. Author(s): Robert K. Tyson. ... Author(s): Anton K. Pfau; Detlev Proch; Friedrich G. Bachmann. Real-time phase ... VLT. Author(s): Philippe Dierickx; Daniel Enard; Fritz Merkle; Lothar Noethe; Raymond N. Wilson. ...
In experimental measurements of the bit-error rate for a laser communication system, we show impr... more In experimental measurements of the bit-error rate for a laser communication system, we show improved performance with the implementation of low-order (tip/tilt) adaptive optics in a free-space link. With simulated atmospheric tilt injected by a conventional piezoelectric tilt mirror, an adaptive optics system with a Xinetics tilt mirror was used in a closed loop. The laboratory experiment replicated a monostatic propagation with a cooperative wave front beacon at the receiver. Owing to constraints in the speed of the processing hardware, the data is scaled to represent an actual propagation of a few kilometers under moderate scintillation conditions. We compare the experimental data and indirect measurement of the bit-error rate before correction and after correction, with a theoretical prediction.
Third in the Field Guide Series, this is a summary of the methods for determining the requirement... more Third in the Field Guide Series, this is a summary of the methods for determining the requirements of an adaptive optics system, the performance of the system, and requirements for the components of the system. Many of the expressions are in the form of integrals. When that is the case, ...
We report on measurements of optical path differences over a commercially-available phase plate m... more We report on measurements of optical path differences over a commercially-available phase plate made to simulate atmospheric turbulence. These measurements were made using an AOA mini-Wavescope Shack-Hartmann wavefront sensor consistent with our closed-loop experimental configuration. The atmospheric phase plate, manufactured by Wavefront Sciences Inc., is made to simulate turbulence for five different zenith angles, from overhead to a horizontal path,
Conventional wavefront correction uses direct wavefront sensing methods such as the Shack-Hartman... more Conventional wavefront correction uses direct wavefront sensing methods such as the Shack-Hartmann sensor to measure the wavefront at the pupil of the system. Image sharpening is an indirect wavefront sensing method where the wavefront correction is performed using measurements from the image plane. Wavefront correction using image sharpening is advantageous in systems where a point source isn't available or where
Third in the Field Guide Series, this is a summary of the methods for determining the requirement... more Third in the Field Guide Series, this is a summary of the methods for determining the requirements of an adaptive optics system, the performance of the system, and requirements for the components of the system. Many of the expressions are in the form of integrals. When that is the case, ...
Proceedings of SPIE - The International Society for Optical Engineering
... studies of system performance and adaptive optics design parameters. Author(s): Robert K. Tys... more ... studies of system performance and adaptive optics design parameters. Author(s): Robert K. Tyson. ... Author(s): Anton K. Pfau; Detlev Proch; Friedrich G. Bachmann. Real-time phase ... VLT. Author(s): Philippe Dierickx; Daniel Enard; Fritz Merkle; Lothar Noethe; Raymond N. Wilson. ...
In experimental measurements of the bit-error rate for a laser communication system, we show impr... more In experimental measurements of the bit-error rate for a laser communication system, we show improved performance with the implementation of low-order (tip/tilt) adaptive optics in a free-space link. With simulated atmospheric tilt injected by a conventional piezoelectric tilt mirror, an adaptive optics system with a Xinetics tilt mirror was used in a closed loop. The laboratory experiment replicated a monostatic propagation with a cooperative wave front beacon at the receiver. Owing to constraints in the speed of the processing hardware, the data is scaled to represent an actual propagation of a few kilometers under moderate scintillation conditions. We compare the experimental data and indirect measurement of the bit-error rate before correction and after correction, with a theoretical prediction.
Third in the Field Guide Series, this is a summary of the methods for determining the requirement... more Third in the Field Guide Series, this is a summary of the methods for determining the requirements of an adaptive optics system, the performance of the system, and requirements for the components of the system. Many of the expressions are in the form of integrals. When that is the case, ...
We report on measurements of optical path differences over a commercially-available phase plate m... more We report on measurements of optical path differences over a commercially-available phase plate made to simulate atmospheric turbulence. These measurements were made using an AOA mini-Wavescope Shack-Hartmann wavefront sensor consistent with our closed-loop experimental configuration. The atmospheric phase plate, manufactured by Wavefront Sciences Inc., is made to simulate turbulence for five different zenith angles, from overhead to a horizontal path,
Conventional wavefront correction uses direct wavefront sensing methods such as the Shack-Hartman... more Conventional wavefront correction uses direct wavefront sensing methods such as the Shack-Hartmann sensor to measure the wavefront at the pupil of the system. Image sharpening is an indirect wavefront sensing method where the wavefront correction is performed using measurements from the image plane. Wavefront correction using image sharpening is advantageous in systems where a point source isn't available or where
Third in the Field Guide Series, this is a summary of the methods for determining the requirement... more Third in the Field Guide Series, this is a summary of the methods for determining the requirements of an adaptive optics system, the performance of the system, and requirements for the components of the system. Many of the expressions are in the form of integrals. When that is the case, ...
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Papers by Robert Tyson