A5051107413- Adaptive optics and wavefront sensing
- Optical Systems and Laser Technology
- Stellar, planetary, and galactic studies
- Advanced optical system design
- Solar Thermal and Photovoltaic Systems
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Satellite Image Processing and Photogrammetry
- Calibration and Measurement Techniques
- Optical Wireless Communication Technologies
- Astro and Planetary Science
- Advanced Measurement and Metrology Techniques
- Astronomy and Astrophysical Research
Lawrence Livermore National Laboratory
2023-2024
University of California, Santa Cruz
2020-2022
HD 106315 and GJ 9827 are two bright, nearby stars that host multiple super-Earths sub-Neptunes discovered by K2 well suited for atmospheric characterization. We refined the planets' ephemerides through Spitzer transits, enabling accurate transit prediction required future characterization transmission spectroscopy. Through a multi-year high-cadence observing campaign with Keck/HIRES Magellan/PFS, we improved mass measurements in anticipation of HST For 9827, modeled activity-induced radial...
The Santa Cruz Extreme AO Lab (SEAL) is a new visible-wavelength testbed designed to advance the state of art in wavefront control for high contrast imaging on large, segmented, ground-based telescopes. SEAL provides multiple options simulating atmospheric turbulence, including custom spatial light modulator. A 37-segment deformable mirror simulates W. M. Keck Observatory segmented primary mirror. adaptive optics system consists woofer/tweeter DM system, and four sensor arms: 1) high-speed...
Advancements in making high-efficiency actuators are an enabling technology for building the next generation of large-format deformable mirrors. The Netherlands Organization Applied Scientific Research (TNO) has developed a new style variable-reluctance actuator that requires approximately eighty times less power to operate as compared traditional voice-coil actuators. We present performance results from laboratory testing TNO's 57-actuator mirror measuring influence functions, linearity,...
Astronomical adaptive optics (AO) is a critical approach to enable ground-based diffraction-limited imaging and high contrast science, with the potential habitable exoplanet on future extremely large telescopes. However, AO systems must improve significantly imaging. Time lag between end of an exposure deformable mirror commands being applied in loop now dominant error term many extreme (e.g., Poyneer et al. 2016), within that component detector read time becoming non-negligible Cetre 2018)....
Advancements in making high-efficiency actuators are an enabling technology for building the next generation of large-format deformable mirrors. The Netherlands Organization Applied Scientific Research (TNO) has developed a new style variable-reluctance actuator that requires approximately eighty times less power to operate as compared traditional voice-coil actuators. We present performance results from laboratory testing TNO's 57-actuator mirror measuring influence functions, linearity,...
Due to turbulence in the atmosphere images taken from ground-based telescopes become distorted. With Adaptive Optics (AO) can be given greater clarity allowing for better observations with existing and are essential coronagraphic exoplanet imaging instruments. A disadvantage many AO systems is that they use sensors cannot correct non-common path aberrations. We have developed a new focal plane wavefront sensing technique address this problem called Deformable Mirror (DM)-based pupil...
Due to turbulence in the atmosphere images taken from ground-based telescopes become distorted. With adaptive optics (AO) can be given greater clarity allowing for better observations with existing and are essential coronagraphic exoplanet imaging instruments. A disadvantage many AO systems is that they use sensors not correct non-common path aberrations. We have developed a new focal plane wavefront sensing technique address this problem called deformable mirror (DM)-based pupil chopping....
In order for telescopes to obtain good and precise images they need see through atmospheric turbulence. To accomplish this compensate turbulence we use Adaptive Optics technologies. thesis analyze the variations in phase delays across plates which simulate characterize them determine how well these reproduce delay variation of atmosphere. This experiment was conducted using Quadrature Polarization Interferometer (QPI) testbed Lab (LAO) at University California Santa Cruz (UCSC). Using QPI...
The development of the Keck All sky Precision Adaptive optics (KAPA) project was initiated in September 2018 to upgrade I adaptive (AO) system enable laser tomography (LTAO) with a four guide star (LGS) asterism. includes replacement existing LMCT Toptica laser, implementation new real-time controller (RTC) and wavefront sensor camera, daytime calibration test platform provide required infrastructure for tomography. work presented here describes performance KAPA tomographic algorithms. This...
The Keck All-Sky Precision Adaptive Optics (KAPA) system project will upgrade the I AO to enable laser tomography with a four guide star (LGS) asterism. This paper describes new infrastructure which is being built for daytime calibration and testing of KAPA tomographic algorithms.
The Santa Cruz Extreme AO Lab (SEAL) is a new visible-wavelength testbed designed to advance the state of art in wavefront control for high contrast imaging on large, segmented, ground-based telescopes. SEAL provides multiple options simulating atmospheric turbulence, including rotating phase plates and custom Meadowlark spatial light modulator that delivers offsets up 6pi at 635nm. A 37-segment IrisAO deformable mirror (DM) simulates W. M. Keck Observatory segmented primary mirror. adaptive...