Dr. Haeun Chung Profile

Dr. Haeun Chung

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 22 August 2024 Poster

Straylight analysis and baffle design for the Aspera UV SmallSat astrophysics mission

Simran Agarwal, Aafaque Raza Khan, Fernando Coronado, Tom Connors, Haeun Chung, Carlos J. Vargas, Erika Hamden, Tom Mcmahon, Hannah Tanquary

Proceedings Volume 13093, 130932R (2024) https://doi.org/10.1117/12.3020457

Proceedings Article | 22 August 2024 Presentation

All-reflective spatial heterodyne spectroscopy: extending high sensitivity velocity resolved measurements into the FUV to EUV and the utilization of novel grating designs for simultaneous detection of discrete passbands

Jason Corliss, Walter Harris, Ricardo Maciel, Derek Gardner, Haeun Chung, Erika Hamden

Proceedings Volume 13093, 1309308 (2024) https://doi.org/10.1117/12.3020398

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Proceedings Article | 22 August 2024 Poster

An overview of the on-ground and in-orbit calibration of Far-Ultraviolet Spectrographs for the Aspera SmallSat

Aafaque Khan, Carl Hergenrother, Miriam Keppler, Heejoo Choi, Haeun Chung, Carlos Vargas, Erika Hamden, Jason Corliss, Elijah Garcia, Daniel Truong, Naomi Yescas, Oswald H. Siegmund, Keri Hoadley, Adrian Martin, Hannah Tanquary, Thomas McMahon, Nazende Kerkeser, Jacob Vider

Proceedings Volume 13093, 1309333 (2024) https://doi.org/10.1117/12.3020385

Proceedings Article | 22 August 2024 Poster

Nox: a SmallSat mission concept for characterizing all-sky Lyman-UV background

Haeun Chung, Carlos Vargas, Erika Hamden, Heejoo Choi, Sumedha Uppnor, Walter Harris, Jason Corliss, Drew Miles, Manuel Quijada, Luis Rodriguez de Marcos, April Jewell, Fabien Grisé, David Schiminovich, Keri Hoadley, John Hennessy, Kwang-il Seon, Youngsoo Jo

Proceedings Volume 13093, 130933M (2024) https://doi.org/10.1117/12.3018507

Proceedings Article | 22 August 2024 Presentation

The Faint Intergalactic-medium Redshifted Emission Balloon (FIREBall-2)

Drew Miles, Vincent Picouet, Chris Martin, Erika Hamden, Keri Hoadley, Bruno Milliard, Shouleh Nikzad, David Schiminovich, David Valls-Gabaud, Simran Agarwal, Philippe Balard, Patrick Blanchard, Harrison Bradley, Nicolas Bray, Ignacio Cevallos, Charles-Antoine Chevrier, Haeun Chung, Marty Crabill, Fernando Cruz Aguirre, Greyson Davis, Xihan Deng, Fabien Harmand, Catherine Hourtolle, Olivia Jones, Nazende Kerkeser, Aafaque Khan, Gillian Kyne, Jessica Li, Zeren Lin, Nicole Melso, Johan Montel, Julie Richard, Meghna Sitaram, Jared Termini, Jean-Noel Valdivia, Didier Vibert, Matthew Werneken

Proceedings Volume 13093, 1309303 (2024) https://doi.org/10.1117/12.3018474

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Proceedings Article | 21 August 2024 Presentation + Paper

Eos: a FUV spectroscopic mission to observe molecular hydrogen in molecular clouds

Erika Hamden, David Schiminovich, Neal Turner, Blakesley Burkhart, Thomas Haworth, Nicole Arulanantham, Haeun Chung, Shuo Kong, Keri Hoadley, Karen Willacy, Thavisha Dharmawardena, Jinyoung Serena Kim, Shmuel Bialy, Min-Young Lee, Miles Smith, Elizabeth Luthman

Proceedings Volume 13093, 130930C (2024) https://doi.org/10.1117/12.3017644

KEYWORDS: Clouds, Ultraviolet radiation, Far ultraviolet, Stars, Molecules, Hydrogen, Molecular spectroscopy, Spectral resolution, Fluorescence, Equipment

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Proceedings Article | 21 August 2024 Presentation + Paper

Optical alignment of contamination-sensitive far-ultraviolet spectrographs for Aspera SmallSat mission

Aafaque Khan, Erika Hamden, Haeun Chung, Heejoo Choi, Daewook Kim, Nicole Melso, Keri Hoadley, Carlos Vargas, Daniel Truong, Elijah Garcia, Bill Verts, Fernando Coronado, Jamison Noenickx, Jason Corliss, Hannah Tanquary, Thomas McMahon, Dave Hamara, Simran Agarwal, Ramona Augustin, Peter Behroozi, Harrison Bradley, Trenton Brendel, Joe Burchett, Jasmine Martinez Castillo, Jacob Chambers, Lauren Corlies, Greyson Davis, Ralf-Jürgen Dettmar, Ewan Douglas, Giulia Ghidoli, Alfred Goodwin, Walter Harris, Carl Hergenrother, J. Christopher Howk, Miriam Keppler, Nazende Ipek Kerkeser, John Kidd, Jessica Li, Gabe Noriega, Sooseong Park, Ryan Pecha, Cork Sauve, David Schiminovich, Sanford Selznic, Oswald Siegmund, Rebecca Su, Sumedha Uppnor, Jacob Vider, Ellie Wolcott, Naomi Yescas, Dennis Zaritsky

Proceedings Volume 13093, 130930A (2024) https://doi.org/10.1117/12.3020822

KEYWORDS: Ultraviolet astronomy, 3D metrology, Far ultraviolet, Optical alignment, Computer generated holography, Tolerancing, Prototyping, Microchannel plates, Vacuum, Contamination, Spectrographs

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Proceedings Article | 21 August 2024 Poster + Paper

Contamination control for the Aspera FUV SmallSat

Nicole Melso, Aafaque Khan, Hannah Tanquary, Elijah Garcia, Daniel Truong, Naomi Yescas, Sooseong Park, Sumedha Uppnor, Carlos Vargas, Haeun Chung, Tom McMahon, Keri Hoadley, Erika Hamden, Jason Corliss, Bill Verts, Simran Agarwal, Ramona Augustin, Peter Behroozi, Harrison Bradley, Trenton Brendel, Joe Burchett, Jasmine Martinez Castillo, Jacob Chambers, Heejoo Choi, Lauren Corlies, Fernando Coronado, Greyson Davis, Ralf-Jürgen Dettmar, Ewan Douglas, Giulia Ghidoli, Alfred Goodwin, Dave Hamara, Walt Harris, Carl Hergenrother, J. Christopher Howk, Miriam Keppler, Nazende ipek Kerkeser, John Kidd, DaeWook Kim, Jessica Li, Jamison Noenickx, Gabe Noriega, Ryan Pecha, Cork Sauve, David Schiminovich, Sanford Selznick, Oswald Siegmund, Rebecca Su, Ellie Wolcott, Dennis Zaritsky

Proceedings Volume 13093, 130932Q (2024) https://doi.org/10.1117/12.3017698

KEYWORDS: Contamination, Vacuum chambers, Contamination control, Humidity, Vacuum, Far ultraviolet

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Proceedings Article | 21 August 2024 Poster + Paper

Realignment and performance verification of two-mirror focal corrector optics for FIREBall-2 using computer generated hologram (CGH)

Simran Agarwal, Aafaque Khan, Harrison Bradley, Haeun Chung, Ipek Nazende Kerkeser, Olivia Jones, Erika Hamden, David Schiminovich, Bruno Milliard, Vincent Picouet, Drew Miles, Ignacio Cevallos-Aleman, Zeren Lin, Jessica Li, Nicole Melso, Christopher Martin, Keri Hoadley, Gillian Kyne, Shouleh Nikzad, David Valls-Gabaud

Proceedings Volume 13093, 130932V (2024) https://doi.org/10.1117/12.3020834

KEYWORDS: Computer generated holography, Optical alignment, Optical surfaces, Spectrographs, Tolerancing, Interferometers, Telescopes, Mirrors, Balloons, Aspheric lenses

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Proceedings Article | 21 August 2024 Presentation + Paper

Aspera payload design overview: UV SmallSat mission to detect and map warm-hot halo gas around the nearby galaxies

Haeun Chung, Carlos Vargas, Erika Hamden, Tom McMahon, Hannah Tanquary, Aafaque Khan, Fernando Coronado, Bill Verts, Nicole Melso, Heejoo Choi, Simran Agarwal, Jason Corliss, Keri Hoadley, Miriam Keppler, Dave Hamara, Elijah Garcia, Daniel Truong, Naomi Yescas, Ramona Augustin, Mateo Batkis, Peter Behroozi, Harrison Bradley, Trenton Brendel, Joseph Burchett, Jasmine Martinez Castillo, Jacob Chambers, Lauren Corlies, Greyson Davis, Ralf-Jürgen Dettmar, Ewan Douglas, Giulia Ghidoli, Alfred Goodwin, Walter Harris, John Hennessy, Carl Hergenrother, J. Christopher Howk, Nazende Ipek Kerkeser, John Kidd, Daewook Kim, Jessica Li, Adrian Martin, Jamison Noenickx, Gabe Noriega, Sooseong Park, Ryan Pecha, Manuel Quijada, L. Rodriguez de Marcos, Cork Sauve, David Schiminovich, Sanford Selznick, Oswald Siegmund, Rebecca Su, Sumedha Uppnor, Ellie Wolcott, Dennis Zaritsky

Proceedings Volume 13093, 1309302 (2024) https://doi.org/10.1117/12.3017274

KEYWORDS: Optical gratings, Microchannel plates, Spectrographs, Optical coatings, Optical alignment, Spectral resolution

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Proceedings Article | 21 August 2024 Poster + Paper

Ultraviolet reflective grating performance verification test setup and simulations for the Aspera SmallSat mission

Jessica Li, Rebecca Su, Sumedha Uppnor, Haeun Chung, Jason Corliss, Simran Agarwal, Aafaque Khan, Elijah Garcia, Naomi Yescas, Daniel Truong, Carlos Vargas, Erika Hamden, Ramona Augustin, Peter Behroozi, Joe Burchett, Heejoo Choi, Lauren Corlies, Greyson Davis, Ralf-Jürgen Dettmar, Ewan Douglas, Carl Hergenrother, Keri Hoadley, J. Christopher Howk, Miriam Keppler, Daewook Kim, Nicole Melso, David Schiminovich, Fernando Coronado, Giulia Ghidoli, Alfred Goodwin, Dave Hamara, Walter Harris, Karl Harshman, John Kidd, Tom McMahon, Jamison Noenickx, Gabe Noriega, Ryan Pecha, Cork Sauve, Sanford Selznick, Hannah Tanquary, Bill Verts, Ellie Wolcott, Dennis Zaritsky

Proceedings Volume 13093, 130932W (2024) https://doi.org/10.1117/12.3017215

KEYWORDS: Optical gratings, Vacuum, Mirrors, Optical alignment, Diffraction gratings, Simulations, Optical fabrication, Microchannel plates, Vacuum chambers, Sensors

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SPIE Journal Paper | 5 August 2024 Open Access

FIREBall-2 UV balloon telescope in-flight calibration system

Jessica Li, Nazende Kerkeser, Aafaque Khan, Simran Agarwal, Olivia Jones, Erika Hamden, Trenton Brendel, Haeun Chung, Vincent Picouet, David Schiminovich, Drew Miles, Keri Hoadley, Ignacio Cevallos-Aleman, Meghna Sitaram, Zeren Lin, Harrison Bradley, D. Martin, Marty Crabill, Fernando Cruz Aguirre, Charles-Antoine Chevrier, Philippe Balard, Patrick Blanchard, Nicolas Bray, Greyson Davis, Xihan Deng, Fabien Harmand, Catherine Hourtolle, Gillian Kyne, Nicole Melso, Johan Montel, Shouleh Nikzad, Alain Peus, Julie Richard, Jared Termini, Jean-Noel Valdivia, David Valls-Gabaud, Didier Vibert, Matthew Werneken

JATIS, Vol. 10, Issue 03, 035002, (August 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.3.035002

KEYWORDS: Calibration, Lamps, Camera shutters, Spectrographs, Zinc, Ultraviolet radiation, Balloons, Telescopes, Ultraviolet telescopes, Sensors

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Proceedings Article | 25 July 2024 Presentation + Paper

Development of a data reduction pipeline for the Aspera SmallSat mission

Miriam Keppler, Haeun Chung, Aafaque Khan, Carl Hergenrother, Carlos Vargas, Jacob Chambers, Jacob Vider, Sanford Selznick, Giulia Ghidoli, Hannah Tanquary, Erika Hamden, J. Christopher Howk, Simran Agarwal, Ramona Augustin, Peter Behroozi, Joe Burchett, Heejoo Choi, Lauren Corlies, Jason Corliss, Fernando Coronado, Greyson Davis, Ralf-Jürgen Dettmar, Ewan Douglas, Elijah Garcia, Alfred Goodwin, Dave Hamara, Walt Harris, Keri Hoadley, John Kidd, Daewook Kim, Jessica Li, Tom McMahon, Nicole Melso, Jamison Noenickx, Gabe Noriega, Ryan Pecha, Cork Sauve, David Schiminovich, Siegmund Oswald, Daniel Truong, Sumedha Uppnor, Bill Verts, Ellie Wollcott, Naomi Yescas, Dennis Zaritsky, Harrison Bradley, Trenton Brendel

Proceedings Volume 13101, 131011Q (2024) https://doi.org/10.1117/12.3017883

KEYWORDS: Calibration, Sensors, Microchannel plates, Device simulation, Space operations, Image processing, Data processing, Extragalactic astronomy, Software development

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Proceedings Article | 5 October 2023 Presentation

Tolerance and alignment study of two-channel telescope spectroscopy for Aspera

Heejoo Choi, Haeun Chung, Carlos Vargas, Aafaque Khan, Jason Corliss, Daewook Kim

Proceedings Volume PC12677, PC126770D (2023) https://doi.org/10.1117/12.2678100

KEYWORDS: Telescopes, Spectroscopy, Optical alignment, Computer generated holography, Microchannel plates, Extreme ultraviolet, Tolerancing, Optical gratings, Galactic astronomy, Satellites

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Proceedings Article | 27 September 2023 Presentation

FIREBall-2 UV balloon telescope in-flight calibration system

Jessica Li, Nazende Kerkeser, Aafaque Khan, Simran Agarwal, Erika Hamden, David Schiminovich, Haeun Chung, Vincent Picouet, Drew Miles, Keri Hoadley, Ignacio Cevallos-Aleman, Harrison Bradley, Olivia Jones, D. Christopher Martin, Marty Crabill, Trenton Brendel, Shouleh Nikzad, Nicolas Bray, Johan Montel, Gillian Kyne, Zeren Lin, Philippe Balard, Patrick Blanchard, Charles-Antoine Chevrier, Alain Peus, Didier Vibert, Nicole Melso, David Valls-Gabaud

Proceedings Volume 12678, 1267804 (2023) https://doi.org/10.1117/12.2676583

KEYWORDS: Calibration, Ultraviolet telescopes, Ultraviolet radiation, Telescopes, Balloons, Zinc, Spectrographs, Emission wavelengths, Camera shutters, Sensors

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Proceedings Article | 27 September 2023 Presentation

Payload design and development of Aspera: the UV SmallSat mission for mapping warm-hot phase gas in nearby galaxy halos

Haeun Chung, Carlos Vargas, Erika Hamden, Thomas McMahon, Hannah Tanquary, Peter Behroozi, Ewan Douglas, Miriam Keppler, Nicole Melso, Simran Agarwal, Aafaque Khan, Jessica Li, Sumedha Uppnor, Jacob Chambers, Giulia Ghidoli, Gabe Noriega, Ryan Pecha, Ellie Wolcott, Fernando Coronado, Elijah Garcia, Daniel Truong, Naomi Yescas, Heejoo Choi, Tom Connors, Jason Corliss, Dave Hamara, Walter Harris, Karl Harshman, Daewook Kim, Corwynn Sauve, Bill Verts, Michael Ward, Dennis Zaritsky, Carl Hergenrother, John Kidd, Sanford Selznick, Oswald Siegmund, Simon Grocott, David Schiminovich, Keri Hoadley

Proceedings Volume 12678, 126780C (2023) https://doi.org/10.1117/12.2677212

KEYWORDS: Galactic astronomy, Design and modelling, Ultraviolet radiation, Spectrographs, Optical alignment, Computer generated holography, Ultraviolet telescopes, Ultraviolet detectors, UV-Vis spectroscopy, Tolerancing

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SPIE Journal Paper | 27 December 2022 Open Access

Hyperion: the origin of the stars. A far UV space telescope for high-resolution spectroscopy over wide fields

Erika Hamden, David Schiminovich, Shouleh Nikzad, Neal Turner, Blakesley Burkhart, Thomas Haworth, Keri Hoadley, Jinyoung Serena Kim, Shmuel Bialy, Geoff Bryden, Haeun Chung, Nia Imara, Rob Kennicutt, Jorge Pineda, Shuo Kong, Yasuhiro Hasegawa, Ilaria Pascucci, Benjamin Godard, Mark Krumholz, Min-Young Lee, Daniel Seifried, Amiel Sternberg, Stefanie Walch, Miles Smith, Stephen Unwin, Elizabeth Luthman, Alina Kiessling, James McGuire, Mina Rais-Zadeh, Michael Hoenk, Thomas Pavlak, Carlos Vargas, Daewook Kim

JATIS, Vol. 8, Issue 04, 044008, (December 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.4.044008

KEYWORDS: Stars, Ultraviolet radiation, Clouds, Far ultraviolet, Space telescopes, Fluorescence, Molecules, Equipment, Galactic astronomy, Spectroscopy

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SPIE Journal Paper | 25 November 2022 Open Access

Balloon-borne FIREBall-2 ultraviolet spectrograph stray light control based on nonsequential reverse modeling of on-sky data

Trenton Brendel, Aafaque Khan, Simran Agarwal, Heejoo Choi, Daewook Kim, Erika Hamden, Vincent Picouet, D. Christopher Martin, Bruno Milliard, David Schiminovich, Shouleh Nikzad, Jean Evrard, Nicolas Bray, Johan Montel, Keri Hoadley, Drew Miles, Gillian Kyne, Jessica Li, Zeren Lin, Haeun Chung, Philippe Balard, Patrick Blanchard, Marty Crabill, Charles-Antoine Chevrier, Alain Peus, Ignacio Cevallos-Aleman, Olivia Jones, Harrison Bradley, Naz Ipek Kerkeser, Matthew Werneken, Didier Vibert, Nicole Melso, David Valls-Gabaud

JATIS, Vol. 8, Issue 04, 048001, (November 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.4.048001

KEYWORDS: Baffles, Stray light, Sensors, Spectrographs, Mirrors, Balloons, Ultraviolet radiation, Stray light control, Tongue, Light scattering

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Proceedings Article | 29 August 2022 Presentation

FIREBall-2(022): challenges, progress, and the road ahead to flight

Keri Hoadley, Chris Martin, Erika Hamden, David Schiminovich, Shouleh Nikzad, Jean Evrard, Bruno Milliard, David Valls-Gabaud, Aafaque Khan, Simran Agarwal, Haeun Chung, Jessica Li, Trenton Brendel, Carlos Vargas, Nicole Melso, Zeren Lin, Marty Crabill, Drew Miles, Gillian Kyne, Vincent Picouet, Ignacio Cevallos, Barbara Santiago, Philippe Balard, Patrick Blanchard, Didier Vibert, Nicolas Bray, Catherine Hourtolle, Frédéri Mirc, Johan Montel, Jared Termini

Proceedings Volume 12181, 1218109 (2022) https://doi.org/10.1117/12.2629052

KEYWORDS: Roads, Galactic astronomy, Ultraviolet radiation, Space operations, Electron multiplying charge coupled devices, Ultraviolet telescopes, Ultraviolet detectors, Spectrographs, Space telescopes, Observatories

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Proceedings Article | 20 August 2021 Presentation + Paper

Aspera: the UV SmallSat telescope to detect and map the warm-hot gas phase in nearby galaxy halos

Haeun Chung, Carlos Vargas, Erika Hamden, Tom McMahon, Kerry Gonzales, Aafaque Khan, Simran Agarwal, Hop Bailey, Peter Behroozi, Trenton Brendel, Heejoo Choi, Tom Connors, Lauren Corlies, Jason Corliss, Ralf-Jürgen Dettmar, David Dolana, Ewan Douglas, John Guzman, Dave Hamara, Walt Harris, Karl Harshman, Carl Hergenrother, Keri Hoadley, John Kidd, Daewook Kim, Jessica Li, Manny Montoya, Corwynn Sauve, David Schiminovich, Sanford Selznick, Oswald Siegmund, Michael Ward, Ellie Wolcott, Dennis Zaritsky

Proceedings Volume 11819, 1181903 (2021) https://doi.org/10.1117/12.2593001

KEYWORDS: Galactic astronomy, Spectrographs, Microchannel plates, Telescopes, Spectral resolution, Ultraviolet radiation, Target detection, Signal detection, Mirrors

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SPIE Journal Paper | 12 March 2021

Long-slit cross-dispersion spectroscopy for Hyperion UV space telescope

Heejoo Choi, Isaac Trumper, Yi-Ting Feng, Hyukmo Kang, Joel Berkson, Haeun Chung, Erika Hamden, Dae Wook Kim

JATIS, Vol. 7, Issue 01, 014006, (March 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.014006

KEYWORDS: Spectroscopy, Sensors, Ultraviolet radiation, Space telescopes, Spectral resolution, Diffraction gratings, Optical design, Freeform optics, Diffraction, Mirrors

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SPIE Journal Paper | 11 July 2018

Noise characterization of IUCAA digital sampling array controller

Sabyasachi Chattopadhyay, A. N. Ramaprakash, Bhushan Joshi, Pravinkumar Chordia, Mahesh Burse, Kalpesh Chillal, Sakya Sinha, Sujit Punnadi, Ketan Rikame, Sungwook Hong, Dhruv Paranjpye, Haeun Chung, Changbom Park, Amitesh Omar

JATIS, Vol. 4, Issue 03, 036002, (July 2018) https://doi.org/10.1117/12.10.1117/1.JATIS.4.3.036002

KEYWORDS: Interference (communication), Charge-coupled devices, Electrons, Analog electronics, Clocks, Amplifiers, Power supplies, Sensors, Field programmable gate arrays, Statistical modeling

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The IUCAA digital sampling array controller (IDSAC) is a flexible and generic yet powerful CCD controller that can handle a wide range of scientific detectors. Based on an easily scalable modular backplane architecture consisting of single board controllers (SBC), IDSAC can control large detector arrays and mosaics. Each of the SBCs offers the full functionality required to control a CCD independently. The SBCs can be cold swapped without the need to reconfigure them. IDSAC is also available in a backplane-less architecture. Each SBC can handle data from up to four video channels with or without dummy outputs at speeds up to 500-kilo pixels per second (kPPS) per channel with a resolution of 16 bits. Communication with a Linux-based host computer is through a USB3.0 interface, with the option of using copper or optical fibers. A field programmable gate array (FPGA) is used as the master controller in each SBC, which allows great flexibility in optimizing performance by adjusting gain, timing signals, bias levels, etc., using user-editable configuration files without altering the circuit topology. Elimination of thermal kTC noise is achieved via digital correlated double sampling (DCDS). The number of digital samples per pixel (for both reset and signal levels) is user configurable. We present the results of noise performance characterization of IDSAC through simulation, theoretical modeling, and actual measurements. The contribution of different types of noise sources is modeled using a tool to predict noise of a generic DCDS signal chain analytically. The analytical model predicts the net input referenced noise of the signal chain to be 5 electrons for 200-k pixels/s per channel readout rate with three samples per pixel. Using a cryogenic test setup in the lab, the noise is measured to be 5.4 e (24.3 μV), for the same readout configuration. With a better-optimized configuration of 500-kPPS readout rate, the measured noise is down to 3.8 electrons RMS (17 μV), with three samples per interval.

Proceedings Article | 10 July 2018 Paper

Multiple rooks of chess: a generic integral field unit deployment technique

Sabyasachi Chattopadhyay, A. Ramaprakash, Pravin Khodade, Kabir Chakravarti, Shabbir Shaikh, Haeun Chung, Sungwook Hong

Proceedings Volume 10706, 107065S (2018) https://doi.org/10.1117/12.2313798

KEYWORDS: Detection and tracking algorithms, Target acquisition, Telescopes, Robots, Space telescopes, Astronomy, Spectrographs, Computer simulations, Astronomical imaging

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Proceedings Article | 10 July 2018 Presentation + Paper

A new photolithography based technique to mass produce microlens+fibre based integral field units (IFUs) for 2D spectroscopy

Sabyasachi Chattopadhyay, Vishal Joshi, A. Ramaprakash, Deepa Modi, Abhay Kohok, Haeun Chung

Proceedings Volume 10706, 107062D (2018) https://doi.org/10.1117/12.2313729

KEYWORDS: Photomasks, Optical lithography, Microlens array, Polishing, Microlens, Metals, Spectrographs, Ultraviolet radiation, Photoresist materials, Back illuminated sensors

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Long-slit astronomical spectroscopy has various limitations when dealing with optimum slit width, atmospheric dispersion, extended source spectroscopy, etc. to name a few. Most of these issues can be solved by the use of optical fibers as the light carrier from the telescope focal plane to the spectrograph. The approach is technically and scientifically flexible in terms of instrument modularity and target acquisition. Implementation of Integral Field Unit (IFU) provides a continuous sampling of extended objects and has a distinct advantage over the single fiber. Using a microlens array in front of the fibers improves the sky coverage by increasing the fill factor. Devasthal Optical Telescope Integral Field Spectrograph (DOTIFS) is a novel instrument being built by the Inter-University Centre for Astronomy and Astrophysics, Pune for the 3.6m Devasthal Optical Telescope (DOT) constructed by Aryabhatta Research Institute of Observational Sciences, Nainital. Each of the 16 DOTIFS IFUs consist of 12x12 spatial elements (spaxels) distributed in a hexagonal honeycomb structure covering 8.7"x7.8" in the sky. Each IFU is made by a photolithography technique to transfer the corresponding microlens array pattern to create a mask which holds the fibers at the focal plane end of an integral field unit. These masks are aligned with the microlens array and fibers are inserted before gluing and polishing. The fiber array can be positioned with a peak positioning error less than 5 μm from the desired position within a fiber array, compared to a requirement of 10 μm. The slit end is made by wire EDM cutting technology and fibers are placed with an accuracy of ~0.3 pixels compared to a 6.75 pixel center-to-center gap between two spectra on the detector. In this paper we provide details of deriving requirements and error budgets. The process of photolithography and the use of generated masks to create an IFU are also discussed. The technique allows very cost effective mass production of IFUs which are very accurately matched with the corresponding microlens array.

Proceedings Article | 9 July 2018 Paper

DOTIFS: fore-optics and calibration unit design

Haeun Chung, A. Ramaprakash, Pravin Khodade, Chaitanya Rajarshi, Sabyasachi Chattopadhyay, Pravin Chordia, Amitesh Omar, Changbom Park

Proceedings Volume 10702, 107027U (2018) https://doi.org/10.1117/12.2312394

KEYWORDS: Calibration, Telescopes, Lamps, Mirrors, Integrating spheres, Spectrographs, Lenses, Light, Optical instrument design, Optomechanical design

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Proceedings Article | 8 July 2018 Paper

DOTIFS: spectrograph optical and opto-mechanical design

Haeun Chung, A. N. Ramaprakash, Pravin Khodade, Deepa Modi, Chaitanya Rajarshi, Sabyasachi Chattopadhyay, Pravin Chordia, Vishal Joshi, Sungwook Hong, Amitesh Omar, Swara Ravindranath, Yong-Sun Park, Changbom Park

Proceedings Volume 10702, 107027A (2018) https://doi.org/10.1117/12.2311594

KEYWORDS: Spectrographs, Cameras, Charge-coupled devices, Optical design, Collimators, Optical filters, Spectral resolution, Tolerancing, Optomechanical design, Optical fibers, Thermal analysis

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Proceedings Article | 18 July 2014 Paper

DOTIFS: a new multi-IFU optical spectrograph for the 3.6-m Devasthal optical telescope

Haeun Chung, A. Ramaprakash, Amitesh Omar, Swara Ravindranath, Sabyasachi Chattopadhyay, Chaitanya Rajarshi, Pravin Khodade

Proceedings Volume 9147, 91470V (2014) https://doi.org/10.1117/12.2053051

KEYWORDS: Spectrographs, Optical fibers, Galactic astronomy, Iterated function systems, Telescopes, Microlens, Charge-coupled devices, Optical telescopes, Software development, Astronomy

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