Dr. Rosemary T. Diaz Profile

Dr. Rosemary T. Diaz

at Jet Propulsion Lab

SPIE Involvement:

Author

Publications (7)

SPIE Journal Paper | 28 October 2015

Demonstration of high contrast with an obscured aperture with the WFIRST-AFTA shaped pupil coronagraph

Eric Cady, Camilo Mejia Prada, Xin An, Kunjithapatham Balasubramanian, Rosemary Diaz, N. Jeremy Kasdin, Brian Kern, Andreas Kuhnert, Bijan Nemati, Ilya Poberezhskiy, A. J. Eldorado Riggs, Robert Zimmer, Neil Zimmerman

JATIS, Vol. 2, Issue 01, 011004, (October 2015) https://doi.org/10.1117/12.10.1117/1.JATIS.2.1.011004

KEYWORDS: Coronagraphy, Photomasks, Planets, Point spread functions, Telescopes, Infrared telescopes, Semiconducting wafers, Reflectivity, Wavefronts, Data modeling

Read Abstract +

The coronagraph instrument on the Wide-Field Infrared Survey Telescope-Astrophysics-Focused Telescope Asset (WFIRST-AFTA) mission study has two coronagraphic architectures, shaped pupil and hybrid Lyot, which may be interchanged for use in different observing scenarios. Each architecture relies on newly developed mask components to function in the presence of the AFTA aperture, and so both must be matured to a high technology readiness level in advance of the mission. A series of milestones were set to track the development of the technologies required for the instrument; we report on completion of WFIRST-AFTA coronagraph milestone 2—a narrowband 10−8 contrast test with static aberrations for the shaped pupil—and the plans for the upcoming broadband coronagraph milestone 5.

Proceedings Article | 16 September 2015

Laboratory performance of the shaped pupil coronagraphic architecture for the WFIRST/AFTA coronagraph

Eric Cady, Camilo Mejia Prada, Xin An, Kunjithapatham Balasubramanian, Rosemary Diaz, N. Jeremy Kasdin, Brian Kern, Andreas Kuhnert, Bijan Nemati, Keith Patterson, Ilya Poberezhskiy, A. J. Eldorado Riggs, Daniel Ryan, Hanying Zhou, Robert Zimmer, Neil Zimmerman

Proceedings Volume 9605, 96050B (2015) https://doi.org/10.1117/12.2189113

KEYWORDS: Coronagraphy, Photomasks, Telescopes, Point spread functions, Microscopes, Infrared telescopes, Silicon, Binary data, Infrared radiation, Stars

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One of the two primary architectures being tested for the WFIRST-AFTA coronagraph instrument is the shaped pupil coronagraph, which uses a binary aperture in a pupil plane to create localized regions of high contrast in a subsequent focal plane. The aperture shapes are determined by optimization, and can be designed to work in the presence of secondary obscurations and spiders - an important consideration for coronagraphy with WFIRST-AFTA. We present the current performance of the shaped pupil testbed, including the results of AFTA Milestone 2, in which ≈ 6 × 10^-9 contrast was achieved in three independent runs starting from a neutral setting.

Proceedings Article | 2 August 2014

Technology development towards WFIRST-AFTA coronagraph

Ilya Poberezhskiy, Feng Zhao, Xin An, Kunjithapatham Balasubramanian, Ruslan Belikov, Eric Cady, Richard Demers, Rosemary Diaz, Qian Gong, Brian Gordon, Renaud Goullioud, Frank Greer, Olivier Guyon, Michael Hoenk, N. Jeremy Kasdin, Brian Kern, John Krist, Andreas Kuhnert, Michael McElwain, Bertrand Mennesson, Dwight Moody, Richard Muller, Bijan Nemati, Keith Patterson, A. J. Riggs, Daniel Ryan, Byoung-Joon Seo, Stuart Shaklan, Erkin Sidick, Fang Shi, Nicholas Siegler, Rémi Soummer, Hong Tang, John Trauger, J. Kent Wallace, Xu Wang, Victor White, Daniel Wilson, Karl Yee, Hanying Zhou, Neil Zimmerman

Proceedings Volume 9143, 91430P (2014) https://doi.org/10.1117/12.2060320

KEYWORDS: Coronagraphy, Sensors, Wavefronts, Wavefront sensors, Iterated function systems, Photomasks, Space telescopes, Exoplanets, Deformable mirrors, Planets

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NASA’s WFIRST-AFTA mission concept includes the first high-contrast stellar coronagraph in space. This coronagraph will be capable of directly imaging and spectrally characterizing giant exoplanets similar to Neptune and Jupiter, and possibly even super-Earths, around nearby stars. In this paper we present the plan for maturing coronagraph technology to TRL5 in 2014-2016, and the results achieved in the first 6 months of the technology development work. The specific areas that are discussed include coronagraph testbed demonstrations in static and simulated dynamic environment, design and fabrication of occulting masks and apodizers used for starlight suppression, low-order wavefront sensing and control subsystem, deformable mirrors, ultra-low-noise spectrograph detector, and data post-processing.

Proceedings Article | 23 July 2010

Advanced wavefront sensing and control testbed (AWCT)

Fang Shi, Scott Basinger, Rosemary Diaz, Robert Gappinger, Hong Tang, Raymond Lam, Erkin Sidick, Randall Hein, Mayer Rud, Mitchell Troy

Proceedings Volume 7739, 77392W (2010) https://doi.org/10.1117/12.858304

KEYWORDS: Wavefronts, Cameras, Wavefront sensors, Mirrors, Interferometers, Optical testing, Phase retrieval, Optical alignment, Light, Sensors

Read Abstract +

The Advanced Wavefront Sensing and Control Testbed (AWCT) is built as a versatile facility for developing and demonstrating, in hardware, the future technologies of wavefront sensing and control algorithms for active optical systems. The testbed includes a source projector for a broadband point-source and a suite of extended scene targets, a dispersed fringe sensor, a Shack-Hartmann camera, and an imaging camera capable of phase retrieval wavefront sensing. The testbed also provides two easily accessible conjugated pupil planes which can accommodate active optical devices such as fast steering mirror, deformable mirror, and segmented mirrors. In this paper, we describe the testbed optical design, testbed configurations and capabilities, as well as the initial results from the testbed hardware integrations and tests.

Proceedings Article | 19 September 2007

Current progress on TPF-I mid-infrared achromatic nulling at the Jet Propulsion Laboratory

Robert Gappinger, Rosemary Diaz, Stefan Martin, Frank Loya, Peter Lawson

Proceedings Volume 6693, 669318 (2007) https://doi.org/10.1117/12.736023

KEYWORDS: Interferometers, Nulling interferometry, Glasses, Mirrors, Beam splitters, Metrology, Infrared radiation, Interferometry, Mid-IR, Exoplanetary science

Read Abstract +

Infrared interferometric nulling is a promising technology for exoplanet detection. Nulling research for the Terrestrial Planet Finder Interferometer has explored several interferometer architectures at the Jet Propulsion Laboratory (JPL). The most recent efforts have focused on an architecture which employs a geometric field flip to achieve the necessary π phase delay in the interferometer. The periscope design currently in use allows for a completely achromatic phase flip. Deep interferometric nulling requires optical path stability, precision optical alignment, intensity balancing, and dispersion correction. This paper will discuss recent efforts to implement a precision optical alignment, stabilize the interferometer environment, implement optical path metrology, control intensity balance, and compensate for dispersion introduced by beamsplitter mismatch.

Proceedings Article | 12 February 2007

Dual-frequency multifunction lidar

Rosemary Diaz, Sze-Chun Chan, Jia-Ming Liu

Proceedings Volume 6457, 64570O (2007) https://doi.org/10.1117/12.699822

KEYWORDS: Microwave radiation, Doppler effect, Velocity measurements, LIDAR, Semiconductor lasers, Ranging, Signal detection, Photodiodes, Laser optics, Target detection

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The design and performance of a multifunction continuous wave dual-frequency lidar system is presented. The system is based on the use of the nonlinear dynamics of an optically injected semiconductor laser. Under proper operating conditions, the laser emits a dual-frequency beam with a broadly tunable microwave separation. The two optical lines are coherently locked to each other using an external microwave synthesizer, resulting in a stable microwave beat frequency. The lidar system is capable of simultaneous velocity and range measurement of remote targets. The velocity is measured from the Doppler shift of the microwave beat frequency. The stability of the microwave beat frequency enables accurate measurement of low velocities. In addition, the stable locking enables long-range measurements because of the long microwave coherence length. Ranging is accomplished by extracting the time-of-flight information carried on the residual microwave phase noise. We demonstrate preliminary measurements of velocities as low as 26 &mgr;m/s and range measurements of 7.95 km with 2 % accuracy.

Proceedings Article | 26 February 2003

SIM internal metrology beam launcher development

Feng Zhao, Rosemary Diaz, Gary Kuan, Norbert Sigrist, Yuri Beregovski, Lawrence Ames, Kalyan Dutta

Proceedings Volume 4852, (2003) https://doi.org/10.1117/12.460940

KEYWORDS: Metrology, Interferometers, Diffraction, Mirrors, Stars, Beam splitters, Heterodyning, Collimators, Optical testing, Oscillators

Read Abstract +

To accomplish micro-arcsecond astrometric measurement, stellar interferometers such as SIM require the measurement of internal optical path length delay with an accuracy of ~10 picometers level. A novel common-path laser heterodyne interferometer suitable for this application was proposed and demonstrated at JPL. In this paper, we present some of the experimental results from a laboratory demonstration unit and design considerations for SIM's internal metrology beam launcher.

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