Dr. Ramya M. Anche Profile

Dr. Ramya M. Anche

Post Doc at Univ of Arizona

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Author

Publications (18)

Proceedings Article | 5 October 2023 Poster + Paper

NMF-based GPU accelerated coronagraphy pipeline

Sai Krishanth P. M., Ewan Douglas, Justin Hom, Ramya Anche, John Debes, Isabel Rebollido, Bin Ren

Proceedings Volume 12680, 1268021 (2023) https://doi.org/10.1117/12.2677739

KEYWORDS: Point spread functions, Stars, Signal to noise ratio, Coronagraphy, Matrices, James Webb Space Telescope, Space telescopes

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Proceedings Article | 5 October 2023 Presentation + Paper

Estimation of polarization aberrations and their effect on the coronagraphic performance for future space telescopes

Ramya Anche, Sebastiaan Haffert, Jaren Ashcraft, Kian Milani, Kyle Van Gorkom, Kevin Derby, Ewan Douglas, Maxwell Millar-Blanchaer

Proceedings Volume 12680, 126800R (2023) https://doi.org/10.1117/12.2677486

KEYWORDS: Coating, Coronagraphy, Polarization, Telescopes, Mirrors, Reflection, Polarization analysis

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Proceedings Article | 4 October 2023 Paper

Approaches to lowering the cost of large space telescopes

Ewan Douglas, Greg Aldering, Greg Allan, Ramya Anche, Roger Angel, Cameron Ard, Supriya Chakrabarti, Laird Close, Kevin Derby, Jerry Edelstein, John Ford, Jessica Gersh-Range, Sebastiaan Haffert, Patrick Ingraham, Hyukmo Kang, Douglas Kelly, Daewook Kim, Michael Lesser, Jarron Leisenring, Yu-Chia Lin, Jared Males, Buddy Martin, Bianca Alondra Payan, Sai Krishanth P. M., David Rubin, Sanford Selznick, Kyle Van Gorkom, Buell Jannuzi, Saul Perlmutter

Proceedings Volume 12677, 126770D (2023) https://doi.org/10.1117/12.2677843

KEYWORDS: Space telescopes, Design and modelling, Telescopes, Observatories, Mirrors, James Webb Space Telescope, Space mirrors, Equipment, Astronomy, Coronagraphy

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Proceedings Article | 3 October 2023 Presentation + Paper

Polarimetric modeling and assessment of science cases for Giant Magellan Telescope-Polarimeter (GMT-Pol)

Ramya Anche, Grant Williams, Hill Tailor, Chris Packham, Daewook Kim, Jaren Ashcraft, Ewan Douglas

Proceedings Volume 12690, 126900F (2023) https://doi.org/10.1117/12.2676777

KEYWORDS: Polarization, Polarimetry, Telescopes, Crosstalk, Modeling, Mirrors, Design and modelling, Spectrographs, Polarization analysis

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Proceedings Article | 28 September 2023 Presentation + Paper

Poke: an open-source, ray-based physical optics platform

Jaren Ashcraft, Ewan Douglas, Daewook Kim, A. J. Riggs, Ramya Anche, Trent Brendel, Kevin Derby, Brandon Dube, Quinn Jarecki, Emory Jenkins, Kian Milani

Proceedings Volume 12664, 1266404 (2023) https://doi.org/10.1117/12.2678001

KEYWORDS: Ray tracing, Polarization, Diffraction, Modeling, Thin films, Interfaces, Simulations, Design and modelling, Wavefronts, Telescopes

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Proceedings Article | 29 August 2022 Presentation + Paper

Stress-induced birefringence in the lenses of Wide-Area Linear Optical Polarimeter-South

Ramya M. Anche, Siddharth Maharana, A. N. Ramaprakash, Pravin Khodade, Deepa Modi, Chaitanya Rajarshi, John A. Kypriotakis, Dmitry Blinov, Hans Kristian Eriksen, Tuhin Ghosh, Georgia V. Panopoulou, Vincent Pelgrims, Raphael Skalidis, Timothy J. Pearson, Eirik Gjerløw, Nikolaos Mandarakas, Vasiliki Pavlidou, Stephen B. Potter, Anthony C. S. Readhead, Konstantinos Tassis, Artem Basyrov, Katerina Papadaki, Trygve Leithe Svalheim, Ingunn K. Wehus

Proceedings Volume 12188, 121882C (2022) https://doi.org/10.1117/12.2629515

KEYWORDS: Birefringence, Polarization, Polarimetry, Telescopes, Finite element methods

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Two unique wide-field and high-accuracy polarimeters named WALOP (Wide-Area Linear Optical Polarimeter)- North and WALOP-South are currently under development at the Inter-University Center for Astronomy and Astrophysics (IUCAA), India, to create a large area optical polarization map of the sky for the upcoming PASIPHAE sky survey. These instruments are designed to achieve a linear polarimetric measurement accuracy of 0.1% across a field of view (FoV) of 30×30 arcminutes. The WALOP-South instrument will be installed first on a 1 m telescope at the Sutherland Observatory, where the temperatures during the night can vary between 10 to -5°C. These temperature variations and the instrument’s pointing to various non-zenithal positions in the sky can introduce stress birefringence in the lenses, leading to time-varying instrumental polarization. This work estimates stress-induced birefringence due to thermal, and gravity stresses on WALOP-South lenses. Using the optomechanical model of the WALOP-South, we carried out Finite Element Analysis (FEA) simulations in SolidWorks software to estimate the stresses for various scenarios of temperature, telescope pointing airmass, and lens mount material (aluminum and titanium). Further, we use the stress tensor analysis to estimate the principal stresses and their directions and consequent birefringence and retardance introduced in the lenses. The stressinduced birefringence will change the optical path length for orthogonal polarization states of the beam passing through the lenses and introduce phase retardation. Overall, with the lens mount design of the instrument, we find that the retardation and consequent instrumental polarization will be within the instrumental accuracy requirements. Additionally, the stress birefringence is found to be higher for aluminum compared to titanium mounts. We further incorporated this retardance in the instrument Mueller matrix estimation to understand its effects on the polarization measurements.

Proceedings Article | 29 August 2022 Poster + Paper

The polarization aberrations of the Gemini Telescope as seen by the Gemini Planet Imager

Maxwell Millar-Blanchaer, Ramya Anche, Meiji M. Nguyen, Jérôme Maire

Proceedings Volume 12184, 121843X (2022) https://doi.org/10.1117/12.2629524

KEYWORDS: Polarization, Gemini Planet Imager, Data modeling, Mirrors, Polarimetry, Gemini Observatory, Telescopes, Coronagraphy, Atmospheric modeling, Planets, Adaptive optics, High angular resolution imaging

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Proceedings Article | 27 August 2022 Poster + Paper

The space coronagraph optical bench (SCoOB): 2. Wavefront sensing and control in a vacuum-compatible coronagraph testbed for spaceborne high-contrast imaging technology

Kyle Van Gorkom, Ewan Douglas, Jaren Ashcraft, Sebastiaan Haffert, Daewook Kim, Heejoo Choi, Ramya Anche, Jared Males, Kian Milani, Kevin Derby, Lori Harrison, Olivier Durney

Proceedings Volume 12180, 121805M (2022) https://doi.org/10.1117/12.2630704

KEYWORDS: Coronagraphy, Wavefronts, Wavefront sensors, Actuators, Optical benches, Astronomical imaging, Cameras, Point spread functions, Imaging technologies, Light scattering

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Proceedings Article | 27 August 2022 Poster + Paper

The space coronagraph optical bench (SCoOB): 1. Design and assembly of a vacuum-compatible coronagraph testbed for spaceborne high-contrast imaging technology

Jaren Ashcraft, Heejoo Choi, Ewan Douglas, Kevin Derby, Kyle Van Gorkom, Daewook Kim, Ramya Anche, Alex Carter, Olivier Durney, Sebastiaan Haffert, Lori Harrison, Maggie Kautz, Jennifer Lumbres, Jared Males, Kian Milani, Oscar Montoya, George Smith

Proceedings Volume 12180, 121805L (2022) https://doi.org/10.1117/12.2628855

KEYWORDS: Coronagraphy, Wavefronts, Mirrors, Interferometers, Wavefront sensors, Point spread functions, Optical benches, Cameras, Astronomical imaging

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Proceedings Article | 27 August 2022 Poster + Paper

Simulations of polarimetric observations of debris disks through the Roman Coronagraph Instrument

Ramya Anche, Ewan Douglas, Kian Milani, Jaren Ashcraft, John Debes

Proceedings Volume 12180, 1218056 (2022) https://doi.org/10.1117/12.2629497

KEYWORDS: Polarization, Mathematical modeling, Polarimetry, Point spread functions, Coronagraphy, Light scattering, Electron multiplying charge coupled devices, Device simulation

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SPIE Journal Paper | 9 March 2021

WALOP-South: a four-camera one-shot imaging polarimeter for PASIPHAE survey. Paper I—optical design

Siddharth Maharana, John Kypriotakis, Anamparambu Ramaprakash, Chaitanya Rajarshi, Ramya Anche, Shrish Shrish, Dmitry Blinov, Hans Eriksen, Tuhin Ghosh, Eirik Gjerløw, Nikolaos Mandarakas, Georgia Panopoulou, Vasiliki Pavlidou, Timothy Pearson, Vincent Pelgrims, Stephen Potter, Anthony C. Readhead, Raphael Skalidis, Konstantinos Tassis, Ingunn Wehus

JATIS, Vol. 7, Issue 01, 014004, (March 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.014004

KEYWORDS: Polarimetry, Polarization, Sensors, Telescopes, Cameras, Prisms, Point spread functions, Optical design, Optical filters, Stars

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Proceedings Article | 13 December 2020 Poster + Paper

Polarization model for the multi-application solar telescope at the Udaipur Solar Observatory

Ramya Anche, M. Ranganathan, Shibu Mathew, K. Sankarasubramanian, G. Anupama, Bireddy Ramya, Avijeet Prasad, Rahul Yadav, Raja Bayanna

Proceedings Volume 11451, 114514O (2020) https://doi.org/10.1117/12.2561217

KEYWORDS: Polarization, Telescopes, Mirrors, Observatories, Polarimetry, Magnetism, Solar processes, Reflection, Reflector telescopes, Instrument modeling

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

WALOP-South: A wide-field one-shot linear optical polarimeter for PASIPHAE survey

Siddharth Maharana, John Kypriotakis, A. Ramaprakash, Pravin Khodade, Chaitanya Rajarshi, Bhushan Joshi, Pravin Chordia, Ramya Anche, Shrish Mishra, Dmitry Blinov, Hans Kristian Eriksen, Tuhin Ghosh, Eirik Gjerløw, Nikolaos Mandarakas, Georgia Panopoulou, Vasiliki Pavlidou, Timothy Pearson, Vincent Pelgrims, Stephen Potter, Anthony C. Readhead, Raphail Skalidis, Konstantinos Tassis, Ingunn Wehus

Proceedings Volume 11447, 114475E (2020) https://doi.org/10.1117/12.2554396

KEYWORDS: Polarimetry, Polarization, Telescopes, Stars, Astronomy, Optical filters, Photometry, Prisms, Vignetting, Optomechanical design

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Proceedings Article | 11 July 2018 Paper

The estimation of the instrumental polarization and crosstalk at the focus of the mid-infrared imaging system for the Thirty Meter Telescope

Ramya Anche, Chris Packham, G. C. Anupama, K. Sankarasubramanian, Maheswar Gopinathan, Manoj Puravankara

Proceedings Volume 10702, 1070298 (2018) https://doi.org/10.1117/12.2312558

KEYWORDS: Polarization, Mirrors, Telescopes, Imaging systems, Mid-IR, Polarimetry, Thirty Meter Telescope, Optical coatings, Modulators

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Proceedings Article | 11 July 2018 Paper

Estimation of polarization aberrations and its effect on the point spread function of the Thirty Meter Telescope

Ramya Anche, G. C. Anupama, S. Sriram, K. Sankarasubramanian, Warren Skidmore

Proceedings Volume 10703, 107034K (2018) https://doi.org/10.1117/12.2312506

KEYWORDS: Mirrors, Polarization, Point spread functions, Telescopes, Coating, Thirty Meter Telescope, Adaptive optics, Monochromatic aberrations, Zemax, Reflection

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SPIE Journal Paper | 22 January 2018

Analysis of polarization introduced due to the telescope optics of the Thirty Meter Telescope

Ramya Manjunath Anche, Asoke Kumar Sen, Gadiyara Chakrapani Anupama, Kasiviswanathan Sankarasubramanian, Warren Skidmore

JATIS, Vol. 4, Issue 01, 018003, (January 2018) https://doi.org/10.1117/12.10.1117/1.JATIS.4.1.018003

KEYWORDS: Mirrors, Polarization, Telescopes, Thirty Meter Telescope, Reflection, Polarimetry, Ray tracing, Calibration, Error analysis, Silver

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Proceedings Article | 15 June 2015 Paper

Analytical modelling of Thirty Meter Telescope optics polarization

Ramya Anche, G. Anupama, Krishna Reddy, Asoke Sen, K. Sankarasubramanian, A. Ramaprakash, Sujan Sengupta, Warren Skidmore, Jenny Atwood, Sivarani Tirupathi, Shashi Bhushan Pandey

Proceedings Volume 9654, 965408 (2015) https://doi.org/10.1117/12.2181397

KEYWORDS: Mirrors, Polarization, Telescopes, Zemax, Modeling, Instrument modeling, Mueller matrices, Polarimetry, Coating, Thirty Meter Telescope

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Proceedings Article | 4 August 2014 Paper

Polarimetric analysis of the Thirty Meter Telescope (TMT) for modeling instrumental polarization characteristics

Jenny Atwood, Warren Skidmore, G. Anupama, Ramya Anche, Krishna Reddy, Asoke Sen

Proceedings Volume 9150, 915013 (2014) https://doi.org/10.1117/12.2056965

KEYWORDS: Polarization, Polarimetry, Telescopes, Instrument modeling, Zemax, Coating, Adaptive optics, Systems modeling, Stars, Thirty Meter Telescope

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Showing 5 of 18 publications

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