12 citations · 22 across the 7 of their papers we have counts for
7 papers
Prediction of wavefronts in adaptive optics to reduce servo lag errors using data mining
Akondi Vyas, M B Roopashree, B Raghavendra Prasad
Servo lag errors in adaptive optics lead to inaccurate compensation of wavefront distortions. An attempt has been made to predict future wavefronts using data mining on wavefronts…
Digital long focal length lenslet array using spatial light modulator
Akondi Vyas, M B Roopashree, B Raghavendra Prasad
Under a thin lens and paraxial approximation, the phase transformation function of a lens was simulated on a Liquid Crystal (LC) based Spatial Light Modulator (SLM). The properties…
Effective coherence length estimation of optical wavefronts
Akondi Vyas, M. B. Roopashree, B. Raghavendra Prasad
In adaptive optics, the measurement of spatial coherence length helps in deciding the optimum design parameters of a Shack Hartmann Sensor (SHS). Two methods of estimating the spat…
Phase characteristics of reflecting and transmitting type twisted nematic spatial light modulators
M B Roopashree, Akondi Vyas, Ravinder Kumar Banyal +1
The phase characteristics of reflecting and transmitting type twisted nematic liquid crystal based Spatial Light Modulators (SLMs) were measured using interferometry. Device parame…
Performance analysis of Fourier and Vector Matrix Multiply methods for phase reconstruction from slope measurements
M B Roopashree, Akondi Vyas, B Raghavendra Prasad
The accuracy of wavefront reconstruction from discrete slope measurements depends on the sampling geometry, coherence length of the incoming wavefronts, wavefront sensor specificat…
Spatial Light Modulator for wavefront correction
Akondi Vyas, M. B. Roopashree, Ravinder Kumar Banyal +1
We present a liquid crystal method of correcting the phase of an aberrated wavefront using a spatial light modulator. A simple and efficient lab model has been demonstrated for wav…