A5009157332- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Optical Polarization and Ellipsometry
- Astronomy and Astrophysical Research
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- solar cell performance optimization
- Optical Network Technologies
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Gender Diversity and Inequality
- History and Developments in Astronomy
- Geomagnetism and Paleomagnetism Studies
- GNSS positioning and interference
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- CCD and CMOS Imaging Sensors
- Retirement, Disability, and Employment
- Advanced Vision and Imaging
- Economic Growth and Productivity
- Work-Family Balance Challenges
- Solar Radiation and Photovoltaics
- Satellite Image Processing and Photogrammetry
- Calibration and Measurement Techniques
National Solar Observatory
2016-2024
Ritsumeikan University
2017
University of Arizona
2013-2014
Pacific University
2007
Abstract We present an overview of the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST), its instruments, and support facilities. The 4 m aperture DKIST provides highest-resolution observations Sun ever achieved. large combined with state-of-the-art instrumentation provide sensitivity to measure vector magnetic field in chromosphere faint corona, i.e. for first time we will be able study most important free-energy source outer solar atmosphere – coronal field. Over...
Abstract The Diffraction-Limited Near-Infrared Spectropolarimeter (DL-NIRSP) is one of the first-light instruments for National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST). DL-NIRSP an integral-field, dual-beam spectropolarimeter intended studying magnetically sensitive spectral lines in Sun’s photosphere, chromosphere, and corona with high resolution polarimetric accuracy. Two novel fiber-optic integral-field units (IFUs), paired selectable feed optics a field-scanning...
We outline polarization performance calculations and predictions for the Daniel K. Inouye Solar Telescope (DKIST) optics show Mueller matrices two of first light instruments. is due to polarization-dependent mirror reflectivity rotations between groups mirrors as telescope moves in altitude azimuth. The Zemax optical modeling software has ray-trace capabilities predicts system given a coating prescription. develop model formula that approximates measured witness sample properties. Estimates...
We provide an update on the construction status of Daniel K. Inouye Solar Telescope. This 4-m diameter facility is designed to enable detection and spatial/temporal resolution predicted, fundamental astrophysical processes driving solar magnetism at their intrinsic scales throughout atmosphere. These data will drive key research its influence winds, flares, coronal mass ejections irradiance variability. The developed support a broad wavelength range (0.35 28 microns) employ state-of-the-art...
The Daniel K. Inouye Solar Telescope (formerly Advanced Technology Telescope) will be the world's largest solar telescope and polarimeter when completed in 2019. Efficient use of to address key science priorities calls for polarization measurements simultaneously over broad wavelength ranges calibration polarimeters high accuracy. Broadband modulation optics utilizing crystal have been designed this application. performance modulators retarders is presented along with a discussion unique...
Abstract The Daniel K. Inouye Solar Telescope (DKIST) advances studies of solar magnetism through high-precision and accuracy in polarimetry at frontier spatial temporal scales. A system model for polarization response azimuth altitude has been developed to calibrate DKIST instruments. team several new modeling performance-estimation techniques coupled with thorough metrology. These efforts ensure that quality is delivered meet stringent requirements. custom spectropolarimetric calibration...
Super achromatic retarders and polychromatic modulators are required to meet the polarimetry specifications of Daniel K. Inouye Solar Telescope. These components have been analyzed toleranced using a birefringent polarization ray trace over wavelength field view.
We outline polarization fringe predictions derived from an application of the Berreman calculus for Daniel K. Inouye Solar Telescope (DKIST) retarder optics. The DKIST baseline design used six crystals, single-layer antireflection coatings, thick cover windows, and oil between all optical interfaces. This tool estimates fringes optic Mueller matrices as functions choices. amplitude period polarized under changes, manufacturing errors, tolerances, several physical factors can now be...
Data products from high spectral resolution astronomical polarimeters are often limited by fringes. Fringes can skew derived magnetic field properties spectropolarimetric data. Fringe removal algorithms also corrupt the data if fringes and object signals too similar. For some narrow-band imaging polarimeters, change calibration retarder dominate errors. Systems-level engineering tools for polarimetric instrumentation require accurate predictions of fringe amplitudes, periods transmission,...
The National Science Foundation's Daniel K. Inouye Solar Telescope (DKIST) is the largest solar telescope in world, utilizing a 4m off-axis primary mirror sending light to ∼16m wide rotating multi-instrument coudé laboratory supported by highly complex active and adaptive optics system, delivering diffraction limited beam. resulting mount size, long optical pathways, various moving components, thermal design leaves DKIST with very tight error budget that susceptible vibration-related...
The US National Science Foundation 4m Daniel K. Inouye Solar Telescope (DKIST) on Haleakala, Maui is the largest solar telescope in world. DKIST's superb resolution and polarimetric sensitivity will enable astronomers to explore origins of magnetism, mechanisms coronal heating drivers flares mass ejections. DKIST operates as a coronagraph at infrared wavelengths, providing crucial measurements magnetic field corona. During its Operations Commissioning Phase, has already conducted significant...
Interference fringes are a major source of systematic error in astronomical spectropolarimeters. We apply the Berreman formalism with recent spatial fringe aperture averaging estimates to design and fabricate new fringe-suppressed polarization optics for several Daniel K. Inouye Solar Telescope (DKIST) use cases. successfully performed an optical contact bond on 120-mm-diameter compound crystal retarder calibration wavelength-dependent suppression factors one three orders magnitude. Special...
Modern observatories and instruments require optics fabricated at larger sizes with more stringent performance requirements. The Daniel K. Inouye Solar Telescope (DKIST) will be the world’s largest solar telescope 4.0-m aperture delivering a 300 W beam 5 arc min field. Spatial variation of retardance is limitation to calibration full Three polarimeters operate seven cameras simultaneously in narrow bandpasses from 380 1800 nm. DKIST polarization must 120 mm diameter Gregorian focus pass...
Construction of the Daniel K. Inouye Solar Telescope (DKIST) is well underway on Haleakalā summit Hawaiian island Maui. Featuring a 4-m aperture and an off-axis Gregorian configuration, DKIST will be world's largest solar telescope. It designed to make high-precision measurements fundamental astrophysical processes produce large amounts spectropolarimetric imaging data. These data support research magnetism its influence wind, flares, coronal mass ejections, irradiance variability. Because...
Daniel K. Inouye Solar Telescope (DKIST) is designed to deliver accurate spectropolarimetric solar data across a wide wavelength range, covering large field of view simultaneously using multiple facility instruments for disk, limb, and coronal observations. We show successful design implementation National Observatory Coudé Laboratory Spectropolarimeter, custom metrology tool efficient continuous broadband polarization calibration the telescope mirrors through coudé laboratory focus. compare...
The DKIST will have a suite of first-light polarimetric instrumentation requiring precise calibration complex articulated optical path. optics are subject to large thermal loads caused by the ~300Watts collected solar irradiance across 5 arc minute field view. process requires stable generate known polarization states. We present modeling several optical, and mechanical effects optics, first transmissive elements in light path, because they absorb substantial heat. Previous studies showed...
We outline polarization performance calculations and predictions for the Daniel K. Inouye Solar Telescope (DKIST) optics show Mueller matrices two of first light instruments. is due to dependent mirror reflectivity rotations between groups mirrors as telescope moves in altitude azimuth. The Zemax optical modeling software has ray-trace capabilities predicts system given a coating prescription. develop model formula that approximates measured witness sample properties. Estimates DKIST matrix...
Astronomical instruments greatly improve wavelength multiplexing capabilities by using beam splitters. In the case of 4-m National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST) solar telescope, over 70 W optical power is distributed simultaneously to four instruments, each with multiple cameras. Many DKIST observing cases require simultaneous observations many narrow bandpasses combined an adaptive optics system. The facility uses five dichroic stations allow at least 11...
A theoretical and experimental investigation of the transmission solid-core photonic crystal fibers (PCFs) filled with nonlinear absorbers shows a sharp change in threshold for optical limiting leakage loss as refractive index material holes approaches that glass matrix. Theoretical calculations mode profiles PCF are agreement results indicate response is due to interaction evanescent field guided holes.
Astronomical spectropolarimeters require high accuracy polarizers with large aperture and stringent uniformity requirements. In solar applications, wire grid are often used as performance is maintained under heat loads temperatures over 200°C. DKIST the NSF’s new 4-m telescope designed to deliver accurate spectropolarimetric data across a wide wavelength range, covering field of view simultaneously using multiple facility instruments. Polarizers at 120 mm diameter calibrate instruments but...
The National Science Foundation's 4m Daniel K. Inouye Solar Telescope (DKIST) on Haleakala, Maui is now the largest solar telescope in world. DKIST's superb resolution and polarimetric sensitivity will enable astronomers to unravel many of mysteries Sun presents, including origin magnetism, mechanisms coronal heating drivers flares mass ejections. Five instruments, four which provide highly sensitive measurements magnetic fields, illusive field faint corona. DKIST operates as a coronagraph...