Dr. Deqing Ren Profile

Dr. Deqing Ren

at California State Univ Northridge

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Author

Publications (37)

SPIE Journal Paper | 8 January 2019

Approach for deformable mirror wavefront error correction

Deqing Ren, Gang Wang, Xi Zhang

OE, Vol. 58, Issue 01, 014102, (January 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.1.014102

KEYWORDS: Wavefronts, Adaptive optics, Point spread functions, Deformable mirrors, Mirrors, Actuators, Camera shutters, Astronomical imaging, Astronomy, Manufacturing

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SPIE Journal Paper | 20 September 2016

Pupil-transformation multiconjugate adaptive optics for solar high-resolution imaging

Deqing Ren, Xi Zhang, Jiangpei Dou, Yongtian Zhu, Robert Broadfoot, Julius Chapman

OE, Vol. 55, Issue 09, 094103, (September 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.9.094103

KEYWORDS: Adaptive optics, Wavefronts, Telescopes, Imaging systems, Turbulence, Tomography, Wavefront sensors, Atmospheric turbulence, Wavefront reconstruction, Solar telescopes

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Proceedings Article | 6 August 2014 Paper

A coronagraph based on two spatial light modulators for active amplitude apodizing and phase corrections

Jiangpei Dou, Deqing Ren, Xi Zhang, Yongtian Zhu, Gang Zhao, Zhen Wu, Rui Chen, Chengchao Liu, Feng Yang, Chao Yang

Proceedings Volume 9147, 91478O (2014) https://doi.org/10.1117/12.2055327

KEYWORDS: Spatial light modulators, Coronagraphy, Point spread functions, Exoplanets, Imaging systems, Telescopes, Phase shift keying, Apodization, Calibration, Modulation

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Proceedings Article | 21 July 2014 Paper

The first portable solar and stellar adaptive optics

Deqing Ren, Rong Li, Xi Zhang, Jiangpei Dou, Yiangtian Zhu, Gang Zhao, Zhen Wu, Rui Chen, Chengchao Liu, Feng Yang, Chao Yang

Proceedings Volume 9148, 91482W (2014) https://doi.org/10.1117/12.2055349

KEYWORDS: Adaptive optics, Telescopes, Cameras, Point spread functions, Calibration, Exoplanets, Actuators, Near infrared, LabVIEW, Stars

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Proceedings Article | 24 September 2012 Paper

A demonstration test of the dual-beam polarimetry differential imaging system for the high-contrast observation

Jiangpei Dou, Deqing Ren, Yongtian Zhu, Xue Wang, Xi Zhang, Rong Li

Proceedings Volume 8446, 84461X (2012) https://doi.org/10.1117/12.924246

KEYWORDS: Imaging systems, Exoplanets, Polarimetry, Point spread functions, Coronagraphy, Polarization, Image processing, Liquid crystals, Wave plates, Speckle

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Proceedings Article | 24 September 2012 Paper

Laboratory test of a polarimetry imaging subtraction system for the high-contrast imaging

Jiangpei Dou, Deqing Ren, Yongtian Zhu, Xi Zhang, Rong Li

Proceedings Volume 8446, 84468D (2012) https://doi.org/10.1117/12.924245

KEYWORDS: Imaging systems, Distortion, Point spread functions, Exoplanets, Polarimetry, Speckle, Prisms, Coronagraphy, Image processing, Astronomy

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Proceedings Article | 21 September 2012 Paper

A dark-hole correction test for the step-transmission filter based coronagraphic system

Jiangpei Dou, Deqing Ren, Yongtian Zhu, Xi Zhang, Rong Li

Proceedings Volume 8442, 84420D (2012) https://doi.org/10.1117/12.924248

KEYWORDS: Coronagraphy, Point spread functions, Exoplanets, Optimization (mathematics), Actuators, Detection and tracking algorithms, Imaging systems, Distortion, Astronomy, Image filtering

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Proceedings Article | 13 September 2012 Paper

Recent progress on the portable solar adaptive optics

Deqing Ren, Xi Zhang, Matt Penn, Haimin Wang, Jiangpei Dou, Yongtian Zhu, Li Rong, Xue Wang

Proceedings Volume 8447, 84473K (2012) https://doi.org/10.1117/12.924447

KEYWORDS: Adaptive optics, Computing systems, Cameras, Solar telescopes, LabVIEW, Computer programming, Telescopes, Digital signal processing, Astronomy, Observatories

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SPIE Journal Paper | 22 May 2012

Demonstration of portable solar adaptive optics system

Deqing Ren, Bing Dong

OE, Vol. 51, Issue 10, 101705, (May 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.10.101705

KEYWORDS: Adaptive optics, Computing systems, Solar telescopes, Wavefront sensors, Telescopes, Observatories, LabVIEW, Optics manufacturing, Digital signal processing, Astronomy

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Proceedings Article | 6 December 2011 Paper

A dual-channel imaging polarimetry system

Xue Wang, Deqing Ren, Jiangpei Dou, Yongtian Zhu, Xi Zhang

Proceedings Volume 8197, 81971I (2011) https://doi.org/10.1117/12.916664

KEYWORDS: Distortion, Imaging systems, Point spread functions, Polarimetry, Coronagraphy, Planets, Exoplanets, Prisms, Stars, Image segmentation

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Proceedings Article | 5 December 2011 Paper

Testing of a high-contrast imaging coronagraph based on an active liquid crystal array

Xi Zhang, Deqing Ren, Yongtian Zhu, Jiangpei Dou, Xue Wang

Proceedings Volume 8197, 81970M (2011) https://doi.org/10.1117/12.916666

KEYWORDS: Coronagraphy, Liquid crystals, Reflectivity, Optical components, Calibration, Planets, Point spread functions, Modulation, Phase shift keying, Polarizers

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Proceedings Article | 5 December 2011 Paper

Design and test of a high-contrast imaging coronagraph based on two 50-step transmission filters

Jiangpei Dou, Deqing Ren, Yongtian Zhu, Xi Zhang, Xue Wang

Proceedings Volume 8197, 81970F (2011) https://doi.org/10.1117/12.916663

KEYWORDS: Coronagraphy, Point spread functions, Image filtering, Exoplanets, Manufacturing, Optical filters, Calibration, Astronomy, Coating, Image transmission

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Proceedings Article | 29 July 2010 Paper

A portable solar adaptive optics system: software and laboratory developments

Deqing Ren, Matt Penn, Claude Plymate, Haimin Wang, Xi Zhang, Bing Dong, Nathan Brown, Andrew Denio

Proceedings Volume 7736, 77363P (2010) https://doi.org/10.1117/12.856224

KEYWORDS: Adaptive optics, LabVIEW, Telescopes, Computer programming, Digital signal processing, Cameras, Software development, Solar telescopes, Computing systems, Image processing

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Proceedings Article | 21 July 2010 Paper

Testing of a transmission-filter coronagraph for ground-based imaging of exoplanets

Jiangpei Dou, Deqing Ren, Yongtian Zhu, Xi Zhang, Xue Wang

Proceedings Volume 7735, 77358E (2010) https://doi.org/10.1117/12.855775

KEYWORDS: Coronagraphy, Exoplanets, Telescopes, Point spread functions, Manufacturing, Optical filters, Image filtering, Diffraction, Coating, Astronomy

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Proceedings Article | 23 September 2009 Paper

A portable solar adaptive optics system

Deqing Ren, Matt Penn, Haimin Wang, Gary Chapman, Claude Plymate

Proceedings Volume 7438, 74380P (2009) https://doi.org/10.1117/12.824457

KEYWORDS: Adaptive optics, Telescopes, Deformable mirrors, Solar telescopes, Space telescopes, Actuators, Infrared telescopes, Magnetism, Cameras, Infrared radiation

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Proceedings Article | 23 September 2009 Paper

An IFU for diffraction-limited 3D spectroscopic imaging: laboratory and on-site tests

Deqing Ren, Christoph Keller, Claude Plymate

Proceedings Volume 7438, 743818 (2009) https://doi.org/10.1117/12.824460

KEYWORDS: Mirrors, Spectrographs, Manufacturing, Optics manufacturing, Spectroscopes, Imaging spectroscopy, Telescopes, Spectroscopy, Adaptive optics, Detector arrays

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Proceedings Article | 18 September 2009 Paper

Wave-front sensing and correction for 4-meter LAMOST

Xi Zhang, Deqing Ren, Yongtian Zhu, Jiangpei Dou

Proceedings Volume 7439, 74390V (2009) https://doi.org/10.1117/12.825417

KEYWORDS: Mirrors, Telescopes, Calibration, Sensing systems, Active optics, Sensors, Actuators, Segmented mirrors, Wavefront sensors, Algorithm development

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Proceedings Article | 20 August 2009 Paper

Laboratory experiment of a high-contrast imaging coronagraph with new step-transmission filters

Jiangpei Dou, Deqing Ren, Yongtian Zhu, Xi Zhang

Proceedings Volume 7440, 744019 (2009) https://doi.org/10.1117/12.825253

KEYWORDS: Coronagraphy, Point spread functions, Image filtering, Manufacturing, Coating, Planets, Optics manufacturing, Optical filters, Chromium, Light scattering

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Proceedings Article | 12 July 2008 Paper

Laboratory experiment of a coronagraph based on step-transmission filters

Jiangpei Dou, Yongtian Zhu, Deqing Ren, Xi Zhang

Proceedings Volume 7010, 70104J (2008) https://doi.org/10.1117/12.785491

KEYWORDS: Coronagraphy, Point spread functions, Manufacturing, Image filtering, Coating, Optical filters, Planets, CCD cameras, Optics manufacturing, Optical aberrations

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Proceedings Article | 27 June 2006 Paper

Development of an IFU for diffraction-limited 3D spectropolarimetry

Deqing Ren, Christoph Keller, Claude Plymate

Proceedings Volume 6269, 62695Z (2006) https://doi.org/10.1117/12.674536

KEYWORDS: Mirrors, Adaptive optics, Spectrographs, Telescopes, Polarimetry, Spectroscopy, Optics manufacturing, Space telescopes, Optical alignment, Imaging spectroscopy

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Proceedings Article | 23 June 2006 Paper

Progress on the 1.6-meter New Solar Telescope at Big Bear Solar Observatory

C. Denker, P. Goode, D. Ren, M. Saadeghvaziri, A. Verdoni, H. Wang, G. Yang, V. Abramenko, W. Cao, R. Coulter, R. Fear, J. Nenow, S. Shoumko, T. Spirock, J. Varsik, J. Chae, J. Kuhn, Y. Moon, Y. Park, A. Tritschler

Proceedings Volume 6267, 62670A (2006) https://doi.org/10.1117/12.671870

KEYWORDS: Telescopes, Mirrors, Space telescopes, Observatories, Adaptive optics, Solar telescopes, Domes, Control systems, Astronomy, Wavefront sensors

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Proceedings Article | 15 June 2006 Paper

Estimated performance of a symmetric nulling coronagraph for exoplanet imaging

D. Ren, E. Serabyn

Proceedings Volume 6265, 62653X (2006) https://doi.org/10.1117/12.674163

KEYWORDS: Coronagraphy, Planets, Point spread functions, Space telescopes, Telescopes, Error analysis, Nulling interferometry, Interferometers, Stars, Signal attenuation

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Proceedings Article | 30 September 2004 Paper

All-sky extrasolar planet searches with multi-object dispersed fixed-delay interferometer in optical and near IR

Jian Ge, Suvrath Mahadevan, Julian van Eyken, Curtis DeWitt, Jerry Friedman, Deqing Ren

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.551989

KEYWORDS: Planets, Stars, Telescopes, Doppler effect, Exoplanets, Interferometers, Visible radiation, Germanium, Sensors, Space telescopes

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Proceedings Article | 19 November 2003 Paper

First planet confirmation with the exoplanet tracker

Julian van Eyken, Jian Ge, Suvrath Mahadevan, Curtis DeWitt, Deqing Ren

Proceedings Volume 5170, (2003) https://doi.org/10.1117/12.506012

KEYWORDS: Stars, Interferometers, Iodine, Visibility, Exoplanets, Planets, Telescopes, Spectrographs, Doppler effect, Calcium

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Proceedings Article | 7 March 2003 Paper

Design and performance of a versatile Penn State near-infrared imager and spectrograph

Jian Ge, Abhijit Chakraborty, John Debes, Deqing Ren, Jerry Friedman

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.461143

KEYWORDS: Coronagraphy, Telescopes, Adaptive optics, Imaging spectroscopy, Silicon, Spectroscopy, Infrared imaging, Prisms, Imaging systems, Space telescopes

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A versatile near IR instrument called Penn State near IR Imager and Spectrograph (PIRIS) with a 256 x 256 PICNIC IR array has been developed at Penn State and saw its first light at the Mt. Wilson 100 inch in October 2001. The optical design consists of five optical subsystems including (1) the slit aperture wheel, (2) an achromat collimator optic, (3) a grism/filter and pupil assembly, (4) a pupil imaging optic, and (5) achromat camera optics. This instrument has imaging, spectroscopy and coronagraph modes. It is being updated to have an integral field 3-D imaging spectroscopy mode and a very high IR spectroscopy mode (R ~ 150,000) with an anamorphic silicon immersion grating in 2003. The instrument is designed to take full advantage of high Strehl ratio images delivered by high order adaptive optics systems. Its imaging mode has f/37 and f/51 optics to allow diffraction-limited imaging in H and K bands, respectively. Its spectroscopy mode has R = 20, 180, 400, 2000, and 5000. The lowest resolution is obtained with a non-deviation prism. The medium resolution spectroscopy mode is conducted with three commercial fused-silica grisms. They can be either used in long slit spectroscopy mode with a blocking filter or used as a cross-disperser for a high resolution silicon grism. High resolution spectroscopy is done with silicon grisms and cross-disperser grisms, which are designed to work on high orders (~ 80) to completely cover H and K bands for R = 5000 separately, or simultaneously cover H and K bands for R = 2000. Coronagraphy is done by inserting an apodizing mask, held in the slit aperture wheel, in the focal plane and a Lyot stop (pupil mask) at a reimaged pupil inside the dewar. Image contrast can be enhanced by using different combinations of the apodizing mask and pupil mask. Several of Gaussian pupil masks have also been installed in the pupil wheel for high contrast imaging. We have successfully detected two substellar companions during our first light at Mt. Wilson 100 inch telescope. We were also able to evaluate our cononagraphy and gaussion pupil mask modes, which demonstrate 10^-3 - 10^-4 contrast 1 arcsec region around a bright point source. A hybrid coronagraph mode, a combination of an apodizing focal plane mask with a Gaussian shaped pupil mask, has been tested and produces 10^-5 - 10^-6 deep contrast as close as 4 λ/D at 2.2 μm in the lab. Low resolution spectroscopy modes including a vision prism (R = 20) and three fused silicon grisms (R = 200 - 400) have been tested in the lab. The spectroscopy results are reported here.

Proceedings Article | 26 February 2003 Paper

Compact high-resolution 3D imaging spectrometer for discovering oases on Mars

Jian Ge, Deqing Ren, Jonathan Lunine, Robert Brown, Roger Yelle, Laurence Soderblom

Proceedings Volume 4859, (2003) https://doi.org/10.1117/12.457334

KEYWORDS: Silicon, Spectroscopy, Mars, Spectral resolution, Mirrors, Infrared spectroscopy, Germanium, Minerals, Spectrographs, Spatial resolution

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Two key infrared instrument components, high resolution silicon grisms and cryogenic image slicers, are being developed at Penn State under NASA support for potential applications in future Mars missions. These new instrument components are planned to be used in a new kind of instrument called a CUBE Machine for detecting and characterizing possible organic compounds on the martian surface through spectroscopically observing martian rocks, soil, and organic matter in IR wavelengths (1-5 μm). It is a compact, robust and light-weight 3D near-IR imaging spectrometer and takes full advantage of these new instrument components to enable an order of magnitude improvement in spectral resolution and observing efficiency and also large simultaneous wavelength coverage (~1-5 μm). Due to high dispersion (n = 3.4), silicon grisms provide at least 2 times higher spectral dispersion than any commercially made grisms. These silicon grisms will be the key elements for making the instrument compact enough to fit into spacecrafts and simultaneously provide high enough spectral resolution to resolve the weak spectral features from organic materials. The reflective imaging slicers enable us to collect spectral information from the Mars surface in three dimensional form - two spatial dimensions and one spectral dimension. This unique capability obviates the need to make many scans to build up the data cube as traditional instruments such as spot scanned spectrometers, or slit scanned spectrometers, resulting in an order of magnitude increase in observing efficiency. In addition, use of the Cube Machine to produce spectral maps of a target body will result in dramatically reduced operational complexity, data processing complexity, and increased geometric fidelity of the final data. With current available large IR arrays such as 2kx2k HgCdTe arrays this new instrument will provide large simultaneous wavelength coverage at high spectral resolution. We have successfully developed silicon grisms with 1 inch in dimension and 54.7 degree in blaze angle. These grisms can provide a diffraction-limited spectral resolution of R~20,000 at 2 μm, which is already high enough for most astrobiology space mission applications. The grisms have very smooth grating facets, with typical rms roughness of ~9 nm, indicating a total integrated scattered light level less than 1% in the entire IR wavelengths to allow high precision spectroscopy. The optical design of the image slicers has been finished. The optics required to assemble a prototype image slicer is being procured.

Proceedings Article | 11 February 2003 Paper

High-order adaptive optical system for big bear solar observatory

Leonid Didkovsky, Alexander Dolgushyn, William Marquette, Jeff Nenow, John Varsik, Philip Goode, Steven Hegwer, Deqing Ren, Steve Fletcher, Kit Richards, Thomas Rimmele, Carsten Denker, Haimin Wang

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.471341

KEYWORDS: Adaptive optics, Fabry–Perot interferometers, Mirrors, Visible radiation, Solar telescopes, Infrared imaging, Optical benches, Observatories, Cameras, Sensors

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Proceedings Article | 11 February 2003 Paper

Image slicer integral field unit for solar telescope

Deqing Ren, Steven Hegwer

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460269

KEYWORDS: Mirrors, Observatories, Polarimetry, Adaptive optics, Spectrographs, Visible radiation, Near infrared, Microlens, Microlens array, Iterated function systems

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Proceedings Article | 11 February 2003 Paper

Optical design of a high-order adaptive optics for the NSO Dunn Solar Telescope and the Big Bear Solar Observatory

Deqing Ren, Steven Hegwer, Thomas Rimmele, Leonid Didkovsky, Philip Goode

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460270

KEYWORDS: Adaptive optics, Mirrors, Optical design, Sensors, Image sensors, Wavefront sensors, Solar telescopes, Observatories, Sun, Wavefront aberrations

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Proceedings Article | 7 February 2003 Paper

Solar adaptive optics: a progress report

Thomas Rimmele, Kit Richards, Steven Hegwer, Deqing Ren, S. Fletcher, Scott Gregory, Leonid Didkovsky, Carsten Denker, William Marquette, J. Marino, Philip Goode

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.457018

KEYWORDS: Adaptive optics, Digital signal processing, Wavefront sensors, Cameras, Diffraction, Mirrors, Sensors, Observatories, Sun, Magnetism

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Proceedings Article | 4 February 2003 Paper

Technical challenges of the Advanced Technology Solar Telescope

Thomas Rimmele, Stephen Keil, Christoph Keller, Frank Hill, John Briggs, Nathan Dalrymple, Bret Goodrich, Steven Hegwer, Rob Hubbard, Jacobus Oschmann, Richard Radick, Deqing Ren, Jeremy Wagner, Stephen Wampler, Mark Warner

Proceedings Volume 4837, (2003) https://doi.org/10.1117/12.456707

KEYWORDS: Telescopes, Adaptive optics, Polarization, Mirrors, Solar telescopes, Optical instrument design, Polarimetry, Solar processes, Magnetism, Monochromatic aberrations

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Proceedings Article | 30 January 2003 Paper

Design and construction of a multiple integral-field unit for 8-m telescopes

Deqing Ren, Jeremy Allington-Smith, Ray Sharples, George Dodsworth

Proceedings Volume 4842, (2003) https://doi.org/10.1117/12.456668

KEYWORDS: Microlens array, Microlens, Telescopes, Near infrared, Spectrographs, Prisms, Visible radiation, Optical instrument design, Iterated function systems, Prototyping

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SPIE Journal Paper | 1 December 2001

Design and construction of a fiber bundle connector using microlenses

Deqing Ren, Ray Sharples, Jeremy Allington-Smith, George Dodsworth, David Robertson, Gavin Dalton

OE, Vol. 40, Issue 12, (December 2001) https://doi.org/10.1117/12.10.1117/1.1416824

KEYWORDS: Connectors, Lenses, Optical alignment, Optical aberrations, Prototyping, Microlens, Light, Fiber couplers, Interfaces, Laser sintering

Proceedings Article | 16 August 2000 Paper

Fiber multi-object spectrograph (FMOS) for the Subaru Telescope

Toshinori Maihara, Kouji Ohta, Naoyuki Tamura, Hiroshi Ohtani, Masayuki Akiyama, Junichi Noumaru, Norio Kaifu, Hiroshi Karoji, Masanori Iye, Gavin Dalton, Ian Parry, David Robertson, Ray Sharples, Deqing Ren, Jeremy Allington-Smith, Keith Taylor, Peter Gillingham

Proceedings Volume 4008, (2000) https://doi.org/10.1117/12.395429

KEYWORDS: Spectrographs, Optical spheres, Telescopes, Near infrared, Mirrors, Astronomical imaging, Spectroscopy, Stars, Optical components, Galactic astronomy

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Proceedings Article | 16 August 2000 Paper

Integral field spectroscopy with the GEMINI multi-object spectrographs

Jeremy Allington-Smith, Robert Content, George Dodsworth, Graham Murray, Deqing Ren, David Robertson, James Turner, John Webster

Proceedings Volume 4008, (2000) https://doi.org/10.1117/12.395436

KEYWORDS: Telescopes, Gemini Observatory, Spectrographs, Field spectroscopy, Astronomical imaging, Adaptive optics, Stars, Spatial resolution, Sensors, Mirrors

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SPIE Journal Paper | 1 March 1999

Apochromatic lenses for near-infrared astronomical instruments

Deqing Ren, Jeremy Allington-Smith

OE, Vol. 38, Issue 03, (March 1999) https://doi.org/10.1117/12.10.1117/1.602131

KEYWORDS: Glasses, Lenses, Near infrared, Lens design, Chromatic aberrations, Cameras, Zinc, Infrared radiation, Astronomy, Optical engineering

Proceedings Article | 23 October 1997 Paper

Compact all-reflective near-infrared spectrograph and imager

Deqing Ren, Jeremy Allington-Smith, Bernard Rauscher

Proceedings Volume 3122, (1997) https://doi.org/10.1117/12.279003

KEYWORDS: Mirrors, Spectrographs, Imaging systems, Sensors, Imaging spectroscopy, Spectroscopes, Near infrared, Cameras, Spherical lenses, Chromatic aberrations

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Showing 5 of 37 publications

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