scholarly journals Closed loop adaptive optics for microscopy without a wavefront sensor

2010 ◽  
Author(s):  
Peter Kner ◽  
Lukman Winoto ◽  
David A. Agard ◽  
John W. Sedat
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Wavefront Sensor

Testing the pyramid wavefront sensor without modulation used in the closed-loop adaptive optics system

2012 ◽  
Author(s):  
Shengqian Wang ◽  
Changhui Rao ◽  
Ang Zhang ◽  
Xuejun Zhang ◽  
Kai Wei ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Wavefront Sensor ◽  
Adaptive Optics System

Experimental Performance Of The I3 Wavefront Sensor For Closed-Loop Adaptive Optics

1980 ◽  
Author(s):  
L. E. Schmutz ◽  
J. K. Bowker ◽  
J. Feinleib ◽  
S. N. Landon ◽  
S. J. Tubbs
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Wavefront Sensor ◽  
Experimental Performance

Wavefront response matrix for closed-loop adaptive optics system based on non-modulation pyramid wavefront sensor

2012 ◽  
Vol 285 (12) ◽  
pp. 2814-2820
Author(s):  
Jianxin Wang ◽  
Fuzhong Bai ◽  
Yu Ning ◽  
Fei Li ◽  
Wenhan Jiang
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Wavefront Sensor ◽  
Response Matrix ◽  
Adaptive Optics System

The pyramid wavefront sensor used in the closed-loop adaptive optics system

2016 ◽  
Author(s):  
Shengqian Wang ◽  
Kai Wei ◽  
Wenjia Zheng ◽  
Changhui Rao
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Wavefront Sensor ◽  
Adaptive Optics System

scholarly journals SCExAO: First Results and On-Sky Performance

2013 ◽  
Vol 8 (S299) ◽  
pp. 34-35 ◽  
Author(s):  
Thayne Currie ◽  
Olivier Guyon ◽  
Frantz Martinache ◽  
Christophe Clergeon ◽  
Michael McElwain ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Focal Plane ◽  
Closed Loop ◽  
Giant Planets ◽  
Wavefront Sensor ◽  
Strehl Ratio ◽  
Wavefront Control ◽  
Contrast Gain ◽  
First Results ◽  
Plane Wavefront

AbstractWe present new on-sky results for the Subaru Coronagraphic Extreme Adaptive Optics imager (SCExAO) verifying and quantifying the contrast gain enabled by key components: the closed-loop coronagraphic low-order wavefront sensor (CLOWFS) and focal plane wavefront control (“speckle nulling”). SCExAO will soon be coupled with a high-order, Pyramid wavefront sensor which will yield > 90% Strehl ratio and enable 106–107 contrast at small angular separations allowing us to image gas giant planets at solar system scales. Upcoming instruments like VAMPIRES, FIRST, and CHARIS will expand SCExAO's science capabilities.

scholarly journals Pyramid wavefront sensor optical gains compensation using a convolutional model

2020 ◽  
Vol 644 ◽  
pp. A6
Author(s):  
V. Chambouleyron ◽  
O. Fauvarque ◽  
P. Janin-Potiron ◽  
C. Correia ◽  
J-F. Sauvage ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Theoretical Description ◽  
System Level ◽  
Wavefront Sensor ◽  
Accurate Estimation ◽  
Common Path ◽  
Closed Loop Systems ◽  
Fourier Filtering ◽  
The Impact

Context. Extremely large telescopes are overwhelmingly equipped with pyramid wavefront sensors (PyWFS) over the more widely used Shack–Hartmann wavefront sensor to perform their single-conjugate adaptive optics (SCAO) mode. The PyWFS, a sensor based on Fourier filtering, has proven to be highly successful in many astronomy applications. However, this sensor exhibits non-linear behaviours that lead to a reduction of the sensitivity of the instrument when working with non-zero residual wavefronts. This so-called optical gains (OG) effect, degrades the closed-loop performance of SCAO systems and prevents accurate correction of non-common path aberrations (NCPA). Aims. In this paper, we aim to compute the OG using a fast and agile strategy to control PyWFS measurements in adaptive optics closed-loop systems. Methods. Using a novel theoretical description of PyWFS, which is based on a convolutional model, we are able to analytically predict the behaviour of the PyWFS in closed-loop operation. This model enables us to explore the impact of residual wavefront errors on particular aspects such as sensitivity and associated OG. The proposed method relies on the knowledge of the residual wavefront statistics and enables automatic estimation of the current OG. End-to-end numerical simulations are used to validate our predictions and test the relevance of our approach. Results. We demonstrate, using on non-invasive strategy, that our method provides an accurate estimation of the OG. The model itself only requires adaptive optics telemetry data to derive statistical information on atmospheric turbulence. Furthermore, we show that by only using an estimation of the current Fried parameter r0 and the basic system-level characteristics, OGs can be estimated with an accuracy of less than 10%. Finally, we highlight the importance of OG estimation in the case of NCPA compensation. The proposed method is applied to the PyWFS. However, it remains valid for any wavefront sensor based on Fourier filtering subject from OG variations.

scholarly journals Model-based aberration correction in a closed-loop wavefront-sensor-less adaptive optics system

2010 ◽  
Vol 18 (23) ◽  
pp. 24070 ◽  
Author(s):  
H. Song ◽  
R. Fraanje ◽  
G. Schitter ◽  
H. Kroese ◽  
G. Vdovin ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Wavefront Sensor ◽  
Aberration Correction ◽  
Model Based ◽  
Adaptive Optics System

Laboratory quantification of a plenoptic wavefront sensor with extended objects

2020 ◽  
Vol 497 (4) ◽  
pp. 4580-4586
Author(s):  
Zhentao Zhang ◽  
Nazim Bharmal ◽  
Tim Morris ◽  
Yonghui Liang
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Optical Design ◽  
Wavefront Sensor ◽  
Wavefront Sensing ◽  
Wide Field ◽  
Loop Correction ◽  
Wavefront Correction ◽  
Set Up ◽  
Experimental Bench

ABSTRACT Adaptive optics (AO) is widely used in ground-based telescopes to compensate the effects of atmosphere distortion, and the wavefront sensor is a significant component in the AO systems. The plenoptic wavefront sensor has been proposed as an alternative wavefront sensor adequate for extended objects and wide field of views. In this paper, a experimental bench has been set up to investigate the slope measurement accuracy and closed-loop wavefront correction performance for extended objects. From the experimental results, it has been confirmed that plenoptic wavefront sensor is suitable for extended objects wavefront sensing with proper optical design. The slope measurements have a good linearity and accuracy when observing extended objects. The image quality is significantly improved after closed-loop correction. A method of global tip/tilt measurement using only plenoptic wavefront sensor frame is proposed in this paper, it is also a potential advantage of plenoptic wavefront sensor in extended objects wavefront sensing.

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