Dr. Stephanie D. Leifer Profile

Dr. Stephanie D. Leifer

at Aerospace Corp

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Author

Publications (12)

SPIE Journal Paper | 8 January 2025

Accordion effect: a consequence of polarized light in precision radial velocity spectrometers

Rose Gibson, Gautam Vasisht, Jason Fucik, Rebecca Oppenheimer, Mahmood Bagheri, Boqiang Shen, Stephanie Leifer, Kittrin Matthews, Charles Beichman, Thomas Lockhart, Bryson Lee Cale

JATIS, Vol. 11, Issue 01, 015001, (January 2025) https://doi.org/10.1117/12.10.1117/1.JATIS.11.1.015001

KEYWORDS: Polarization, Prisms, Spectrographs, Telescopes, Birefringence, Equipment, Point spread functions, Single mode fibers, Polarized light, Fabry Perot interferometers

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Proceedings Article | 14 August 2024 Poster + Paper

Recent upgrades to the Keck Planet Imager and Characterizer

Daniel Echeverri, Nemanja Jovanovic, Jacques-Robert Delorme, Charlotte Guthery, Mitsuko Roberts, Reston Nash, Katelyn Horstman, Jerry Xuan, Yinzi Xin, Luke Finnerty, Chih-Chun Hsu, Garreth Ruane, Stepahnie Leifer, Jake Zimmer, Svarun Soda, Tobias Schofield, J. Kent Wallace, Jason Wang, Dimitri Mawet, Eduardo Marin, Peter Wizinowich, Jinhao Ge, Maodong Gao

Proceedings Volume 13096, 130962D (2024) https://doi.org/10.1117/12.3019085

KEYWORDS: Adaptive optics, Optical switching, K band, Single mode fibers, Prisms, Exoplanets, Nulling interferometry, Astronomical spectroscopy

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Proceedings Article | 18 July 2024 Presentation + Paper

Fiber-fed high-resolution infrared spectroscopy at the diffraction limit with Keck-HISPEC and TMT-MODHIS: status update

Dimitri Mawet, Michael Fitzgerald, Quinn Konopacky, Nemanja Jovanovic, Ashley Baker, David Andersen, Etienne Artigau, John Bailey, Charles Beichman, Björn Benneke, Rob Bertz, Christopher Betters, David Brearly, Aaron Brown, James Brugger, Richard Dekany, Jocelyn Ferrara, Alberto Franco, Jason Fucik, Rose Gibson, Tim Greffe, Samuel Halverson, Christopher Johnson, Marc Kassis, Takayuki Kotani, Yoo Jung Kim, Stephanie Leifer, Sergio Leon-Saval, Jonathan Lin, Larry Lingvay, Jerome Maire, Eduardo Marin, Kenneth Magnone, Don Neill, Rishi Pahuja, Garreth Ruane, Greg Sercel, Svarun Soda, Ji Man Sohn, Jonathan Steiner, Motohide Tamura, Jim Thorne, Eric Wang, Truman Wold, Ray Zarzaca

Proceedings Volume 13096, 130960W (2024) https://doi.org/10.1117/12.3019238

KEYWORDS: Spectrographs, Exoplanets, Equipment, Design, Planets, Spectral resolution, Single mode fibers, Infrared spectroscopy, Adaptive optics, Telescopes

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Proceedings Article | 18 July 2024 Poster + Paper

Calibration unit design for Keck/High-Resolution Infrared Spectrograph for Exoplanet Characterization (HISPEC)

Ben Sappey, Quinn Konopacky, Jerome Maire, Ashley Baker, Nemanja Jovanovic, Samuel Halverson, Rose Gibson, Stephanie Leifer, Jocelyn Ferrara, Rob Bertz, Dimitri Mawet, Michael Fitzgerald, Marc Kassis, John Bailey, Jason Fucik, Don Neill, Chris Johnson, Ken Magnone

Proceedings Volume 13096, 130966K (2024) https://doi.org/10.1117/12.3020409

KEYWORDS: Frequency combs, Calibration, Spectrographs, Lamps, Fabry Perot interferometers, Gas cells, Equipment, Sensors, Single mode fibers, Tunable filters, Optical filters

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Proceedings Article | 5 October 2023 Presentation + Paper

The development of HISPEC for Keck and MODHIS for TMT: science cases and predicted sensitivities

Quinn Konopacky, Ashley Baker, Dimitri Mawet, Michael Fitzgerald, Nemanja Jovanovic, Charles Beichman, Garreth Ruane, Rob Bertz, Hiroshi Terada, Richard Dekany, Larry Lingvay, Marc Kassis, David Anderson, Motohide Tamura, Björn Benneke, Thomas Beatty, Tuan Do, Shogo Nishiyama, Peter Plavchan, Jason Wang, Ji Wang, Adam Burgasser, Jean-Baptiste Ruffio, Huihao Zhang, Aaron Brown, Jason Fucik, Aidan Gibbs, Rose Gibson, Sam Halverson, Christopher Johnson, Sonia Karkar, Takayuki Kotani, Evan Kress, Stephanie Leifer, Kenneth Magnone, Jerome Maire, Rishi Pahuja, Michael Porter, Mitsuko Roberts, Ben Sappey, Jim Thorne, Eric Wang, Etienne Artigau, Geoffrey Blake, Gabriela Canalizo, Guo Chen, Greg Doppmann, René Doyon, Courtney Dressing, Min Fang, Thomas Greene, Greg Herczeg, Lynne Hillenbrand, Andrew Howard, Stephen Kane, Tiffany Kataria, Eliza Kempton, Heather Knutson, David Lafrenière, Chao Liu, Stanimir Metchev, Max Millar-Blanchaer, Norio Narita, Gajendra Pandey, S.P. Rajaguru, Paul Robertson, Colette Salyk, Bun'ei Sato, Evertt Schlawin, Sujan Sengupta, Thirupathi Sivarani, Warren Skidmore, Gautam Vasisht, Chikako Yasui, Hui Zhang

Proceedings Volume 12680, 1268007 (2023) https://doi.org/10.1117/12.2681522

KEYWORDS: Planets, Stars, Exoplanets, Spectrographs, Atmospheres, Spectroscopy, Telescopes

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SPIE Journal Paper | 7 September 2023 Open Access

Commissioning observations of HD 189733 with the PAlomar Radial Velocity Instrument

Bryson L. Cale, Aurora Kesseli, Charles Beichman, Gautam Vasisht, Rose Gibson, Rebecca Oppenheimer, Jason Fucik, Dimitri Mawet, Christopher Paine, Kittrin Matthews, Thomas Lockhart, Samuel Halverson, Boqiang Shen, Mahmood Bagheri, Stephanie Leifer, Peter Plavchan, David Hover

JATIS, Vol. 9, Issue 03, 038006, (September 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.3.038006

KEYWORDS: Signal detection, Spectral resolution, Spectrographs, Point spread functions, Single mode fibers, Doppler effect, Planets, Telescopes, Equipment, Exoplanets

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Proceedings Article | 29 August 2022 Poster + Paper

An all-photonic, dynamic device for flattening the spectrum of a laser frequency comb for precise calibration of radial velocity measurements

Nemanja Jovanovic, Pradip Gatkine, Boqiang Shen, Maodong Gao, Nick Cvetojevic, Katarzyna Ławniczuk, Ronald Broeke, Charles Beichman, Stephanie Leifer, Jeffrey Jewell, Gautam Vasisht, Dimitri Mawet

Proceedings Volume 12188, 121885D (2022) https://doi.org/10.1117/12.2630301

KEYWORDS: Waveguides, Frequency combs, Modulation, Calibration, Spectrographs, Precision calibration, Polarization, Velocity measurements, Light sources, Chemical elements

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Laser frequency combs are fast becoming critical to reaching the highest radial velocity precisions. One shortcoming is the highly variable brightness of the comb lines across the spectrum (up to 4-5 orders of magnitude). This can result in some lines saturating while others are at low signal and lost in the noise. Losing lines to either of these effects reduces the precision and hence effectiveness of the comb. In addition, the brightness of the comb lines can vary with time which could drive comb lines with initially reasonable SNR’s into the two regimes described above. To mitigate these two effects, laser frequency combs use optical flattener’s. Flattener’s are typically bulk optic setups that disperse the comb light with a grating, and then use a spatial light modulator to control the amplitude across the spectrum before recombining the light into another single mode fiber and sending it to the spectrograph. These setups can be large (small bench top), expensive (several hundred thousand dollars) and have limited stability. To address these issues, we have developed an all-photonic spectrum flattener on a chip. The device is constructed from optical waveguides on a SiN chip. The light from the laser frequency comb’s output optical fiber can be directly connected to the chip, where the light is first dispersed using an arrayed waveguide grating. To control the brightness of each channel, the light is passed through a Mach-Zehnder interferometer before being recombined with a second arrayed waveguide grating. Thermo-optic phase modulators are used in each channel before recombination to path length match the channels as needed. Here we present the results from our first generation prototype. The device operates from 1400-1800 nm (covering the H band), with 20, 20 nm wide channels. The device was mounted on a PCB board to enable electrical control of the active elements and tested in the laboratory. It was demonstrated that the Mach- Zehnder’s allowed for nearly 40 dBs of dynamic modulation of the spectrum, which is greater than that offered by most spatial light modulators. With a smooth spectrum light source (superluminescent light source), we reduced the spectral variation to 3 dBs, limited by the properties of the components used. On a laser frequency comb which had strong modulations at high spatial frequencies, we still managed to reduce the modulation to 5 dBs. These devices are of the order of a US quarter and could play a significant role in future PRV and EPRV initiatives.

Proceedings Article | 29 August 2022 Presentation + Paper

Fiber-fed high-resolution infrared spectroscopy at the diffraction limit with Keck-HISPEC and TMT-MODHIS: status update

Dimitri Mawet, Michael Fitzgerald, Quinn Konopacky, Nemanja Jovanovic, Ashley Baker, Charles Beichman, Rob Bertz, Richard Dekany, Jason Fucik, Mitsuko Roberts, Michael Porter, Rishi Pahuja, Garreth Ruane, Stephanie Leifer, Samuel Halverson, Aidan Gibbs, Chris Johnson, Evan Kress, Kenneth Magnone, Ji Man Sohn, Eric Wang, Aaron Brown, Jerome Maire, Ben Sappey, David Andersen, Hiroshi Terada, Marc Kassis, Etienne Artigau, Bjorn Benneke, Rene Doyon, Takayuki Kotani, Motohide Tamura, Thomas Beatty, Peter Plavchan, Tuan Do, Shogo Nishiyama, Jason Wang, Ji Wang

Proceedings Volume 12184, 121841R (2022) https://doi.org/10.1117/12.2630142

KEYWORDS: Planets, Exoplanets, Stars, Spectrographs, Spectroscopy, Spectral resolution, Adaptive optics, Single mode fibers, Infrared spectroscopy, Telescopes

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Proceedings Article | 29 August 2022 Presentation + Paper

Innovations and advances in instrumentation at the W. M. Keck Observatory, vol. II

Marc Kassis, Steve Allen, Carlos Alvarez, Ravinder Banyal, Robert Bertz, Charles Beichman, Aaron Brown, Matthew Brown, Gerald Cabak, Kevin Bundy, Sylvain Cetre, Jason Chin, Mark Chun, Will Deich, Richard Dekany, Jacques Delorme, Mark Devenot, Greg Doppmann, Michael Fitzgerald, Jason Fucik, Grant Hill, Philip Hinz, Bradford Holden, Andrew Howard, Maodong Gao, Steve Gibson, Percy Gomez, Colby Gottschalk, Peter Gillingham, Tucker Jones, Nemanja Jovanovic, Evan Kirby, Quinn Konopacky, Shanti Krishnan, Renate Kupke, James Larkin, Stephanie Leifer, Hilton Lewis, Scott Lilley, Jessica Lu, James Lyke, Nick MacDonald, Eduardo Marin, Matt Matuszewski, Dimitri Mawet, Rosalie McGurk, Maxwell Millar-Blanchaer, Reston Nash, Craig Nance, James Neill, John O'Meara, Eliad Peretz, Claire Poppett, John Mather, Matthew Radovan, Mitsuko Roberts, Sam Ragland, Kodi Rider, Constance Rockosi, Dale Sandfor, Boqiang Shen, Charles Steidel, Sunil Simha, Andy Skemer, Deno Stelter, Avinash Surendran, James Thorne, Ben McCarney, Kyle Lanclos, Ashley Baker, Ryan Rubenzahl, Arpita Roy, Sam Halverson, Jerry Edelstein, Christopher Martin, Maureen Savage, Dale Sandford, Stephanie Sallum, Josh Walawender, Peter Wizinowich, Kyle Westfall, Kerry Vahala, Shelley Wright, Truman Wold, Sherry Yeh

Proceedings Volume 12184, 1218405 (2022) https://doi.org/10.1117/12.2628630

KEYWORDS: Adaptive optics, Spectrographs, Exoplanets, Sensors, Spectroscopy, Imaging systems, Telescopes, Planets, Cameras, Observatories

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Proceedings Article | 29 August 2022 Poster

Achieving 1 m/s instrument radial velocity stability with the Palomar Radial Velocity Instrument

Rose Gibson, Gautam Vasisht, Rebecca Oppenheimer, Chalres Beichman, Stephanie Leifer, Jason Fucik, Christopher Paine, Mahmood Bagheri, Bryson Cale

Proceedings Volume 12184, 121845C (2022) https://doi.org/10.1117/12.2644698

KEYWORDS: Near infrared, Stars, Single mode fibers, Motion measurement, Frequency combs, Telescopes, Spectroscopy, Spectrographs, Spectral resolution, Signal detection

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Proceedings Article | 13 December 2020 Presentation + Paper

A microresonator-based etalon for visible light precision radial velocity measurements

Stephanie Leifer, Anatoliy Savchenkov, Abdelkrim El Amili, Charles Beichman, Andrey Matsko, Yu-Hung Lai, Stuart Love, Dmitri Strekalov, Christian Schwab, Lute Maleki, Samuel Halverson, Ian Coddington, Mahmood Bagheri

Proceedings Volume 11447, 114471L (2020) https://doi.org/10.1117/12.2562369

KEYWORDS: Fabry–Perot interferometers, Visible radiation, Velocity measurements, Calibration, Spectral calibration, Magnesium fluoride, Microresonators, Ceramics, Composites, Resonators

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Proceedings Article | 2 March 2020 Presentation + Paper

Status and future developments of integrated photonic spectrographs for astronomy and Earth and planetary sciences

N. Jovanovic, N. Cvetojevic, M. Daal, B. Mazin, R. Moreira, D. Mawet, G. Vasisht, C. Beichman, K. Wallace, J. Jewell, S. Leifer, R. Dekany, M. Porter

Proceedings Volume 11287, 112870K (2020) https://doi.org/10.1117/12.2546959

KEYWORDS: Spectrographs, Astronomy, Telescopes, Waveguides, Single mode fibers, Spectral resolution, Sensors, Integrated photonics, Planetary science, Photonic devices

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Showing 5 of 12 publications

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