4 citations · 8 across the 10 of their papers we have counts for
11 papers
On-sky capabilities and performance of the Keck All Sky Precision Adaptive Optics system
Avinash Surendran, Maxwell Service, Jacques R. Delorme +21
The Keck All Sky Precision Adaptive optics (KAPA) project upgrades the Keck I adaptive optics system to enable laser tomography using a four laser guide star (LGS) asterism. KAPA i…
Ground control to major time-lag: on-sky results of data-driven predictive wavefront control at Keck Observatory
Jules Fowler, Rebeca Jensen-Clem, Sylvain Cetre +12
Directly imaging and characterizing exoplanets requires extreme adaptive optics (XAO), which achieves exquisite wavefront correction over a small (<5") field of view. Temporal erro…
Slow focus sensor for the Keck I laser guide star adaptive optics system using focal plane wavefront sensing
Rafael M. Salgueiro, Carlos M. Correia, Benoit Neichel +7
Laser guide stars (LGSs) have been deployed for the last 20-30 years in ground-based astronomical telescopes to overcome the limited sky coverage of classical adaptive optics (AO)…
Increasing science yield with a twilight observing program with the SCALES instrument at Keck
Isabel J. Kain, Carlos Alvarez, John M. O'Meara +13
While astronomical twilight closes the observing window for optical astronomers, the infrared sky remains dark even through sunrise, allowing IR astronomers to observe through twil…
Gaussian phase autocorrelation as an accurate compensator for FFT-based atmospheric phase screen simulations
Sorabh Chhabra, Jyotirmay Paul, A. N. Ramaprakash +1
Accurately simulating the atmospheric turbulence behaviour is always challenging. The well-known FFT based method falls short in correctly predicting both the low and high frequenc…
Daytime calibration and testing of the Keck All sky Precision Adaptive Optics Tomography System
Avinash Surendran, Jacques R. Delorme, Carlos M. Correia +12
The development of the Keck All sky Precision Adaptive optics (KAPA) project was initiated in September 2018 to upgrade the Keck I adaptive optics (AO) system to enable laser tomog…
A generalized approach to compensate for low and high frequency errors in FFT based phase screen simulations
Sorabh Chhabra, Jyotirmay Paul, Anamparambu N. Ramaprakash +1
Fast Fourier Transform based phase screen simulations give accurate results only when the screen size () is much larger than the outer scale parameter (). Otherwise, they f…
Scalable Platform for Adaptive optics Real-time Control (SPARC) Part 2: Field Programmable Gate Array (FPGA) implementation and performance
Avinash Surendran, Mahesh P. Burse, A. N. Ramaprakash +1
The next generation of Adaptive Optics (AO) systems on large telescopes will require immense computation performance and memory bandwidth, both of which are challenging with the te…
Scalable Platform for Adaptive optics Real-time Control (SPARC) Part 1: Concept, Architecture and Validation
Avinash Surendran, Mahesh P. Burse, A. N. Ramaprakash +3
We demonstrate a novel architecture for Adaptive Optics (AO) control based on FPGAs (Field Programmable Gate Arrays), making active use of their configurable parallel processing ca…
Development of a Lunar Scintillometer as part of the National Large Optical Telescope Site Survey
Avinash Surendran, Padmakar S. Parihar, Ravinder K Banyal +1
Ground layer turbulence is a very important site characterization parameter used to assess the quality of an astronomical site. The Lunar Scintillometer is a simple and effective s…
Development of a scalable generic platform for adaptive optics real time control
Avinash Surendran, Mahesh P. Burse, A. N. Ramaprakash +1
The main objective of the present project is to explore the viability of an adaptive optics control system based exclusively on Field Programmable Gate Arrays (FPGAs), making stron…