Dr. Xiaoke Wan Profile

Dr. Xiaoke Wan

Sr Optical Engineer at Digital Signal Corp

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Publications (11)

Proceedings Article | 24 September 2012 Paper

Design and performance of a new generation, compact, low cost, very high Doppler precision and resolution optical spectrograph

Jian Ge, Bo Zhao, Scott Powell, Ji Wang, Adam Fletcher, Liang Chang, John Groot, Xiaoke Wan, Hali Jakeman, Derek Myers, Elliot Grafer, Jian Liu, Frank Varosi, Sidney Schofield, Alexandria Moore, Maria-Ines van Olphen, Jordan Katz, Rory Barnes

Proceedings Volume 8446, 84468R (2012) https://doi.org/10.1117/12.925795

KEYWORDS: Planets, Stars, Doppler effect, Telescopes, Calibration, Spectrographs, Sensors, Exoplanets, Spectral resolution, Photons

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Proceedings Article | 13 September 2012 Paper

Silicon immersion gratings and their spectroscopic applications

Jian Ge, Bo Zhao, Scott Powell, Adam Fletcher, Xiaoke Wan, Liang Chang, Hali Jakeman, Dimitrios Koukis, David Tanner, Dennis Ebbets, Jonathan Weinberg, Sarah Lipscy, Rich Nyquist, John Bally

Proceedings Volume 8450, 84502U (2012) https://doi.org/10.1117/12.925803

KEYWORDS: Infrared spectroscopy, Silicon, Spectroscopy, Spectrographs, Stars, Near infrared, Diffraction gratings, Infrared telescopes, Coating, Spectral resolution

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Silicon immersion gratings (SIGs) offer several advantages over the commercial echelle gratings for high resolution infrared (IR) spectroscopy: 3.4 times the gain in dispersion or ~10 times the reduction in the instrument volume, a multiplex gain for a large continuous wavelength coverage and low cost. We present results from lab characterization of a large format SIG of astronomical observation quality. This SIG, with a 54.74 degree blaze angle (R1.4), 16.1 l/mm groove density, and 50x86 mm² grating area, was developed for high resolution IR spectroscopy (R~70,000) in the near IR (1.1-2.5 μm). Its entrance surface was coated with a single layer of silicon nitride antireflection (AR) coating and its grating surface was coated with a thin layer of gold to increase its throughput at 1.1-2.5 m. The lab measurements have shown that the SIG delivered a spectral resolution of R=114,000 at 1.55 m with a lab testing spectrograph with a 20 mm diameter pupil. The measured peak grating efficiency is 72% at 1.55 m, which is consistent with the measurements in the optical wavelengths from the grating surface at the air side. This SIG is being implemented in a new generation cryogenic IR spectrograph, called the Florida IR Silicon immersion grating spectrometer (FIRST), to offer broad-band high resolution IR spectroscopy with R=72,000 at 1.4-1.8 um under a typical seeing condition in a single exposure with a 2kx2k H2RG IR array at the robotically controlled Tennessee State University 2-meter Automatic Spectroscopic Telescope (AST) at Fairborn Observatory in Arizona. FIRST is designed to provide high precision Doppler measurements (~4 m/s) for the identification and characterization of extrasolar planets, especially rocky planets in habitable zones, orbiting low mass M dwarf stars. It will also be used for other high resolution IR spectroscopic observations of such as young stars, brown dwarfs, magnetic fields, star formation and interstellar mediums. An optimally designed SIG of the similar size can be used in the Silicon Immersion Grating Spectrometer (SIGS) to fill the need for high resolution spectroscopy at mid IR to far IR (~25-300 μm) for the NASA SOFIA airborne mission in the future.

Proceedings Article | 13 September 2012 Paper

Wide-field tracking of moving objects with a compact multi-object dispersed fixed-delay interferometer

Jian Ge, Xiaoke Wan, Derek Myers, Scott Powell

Proceedings Volume 8450, 84501C (2012) https://doi.org/10.1117/12.926689

KEYWORDS: Doppler effect, Interferometers, Remote sensing, Spectrographs, Germanium, Imaging systems, Cameras, Velocity measurements, Data processing, Head

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Proceedings Article | 22 July 2010 Paper

Monolithic Michelson Interferometer as ultra stable wavelength reference

Xiaoke Wan, Jian Ge

Proceedings Volume 7734, 77343N (2010) https://doi.org/10.1117/12.857616

KEYWORDS: Interferometers, Michelson interferometers, Fabry–Perot interferometers, Calibration, Optical filters, Mirrors, Signal detection, Lamps, Light sources, Multimode fibers

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Proceedings Article | 22 July 2010 Paper

Development of Monolithic Michelson Interferometer for RV measurement in IR

Ji Wang, Xiaoke Wan, Jian Ge

Proceedings Volume 7734, 77343Q (2010) https://doi.org/10.1117/12.857255

KEYWORDS: Interferometers, Calibration, Doppler effect, Velocity measurements, Precision calibration, Sensors, Interferometry, Temperature metrology, Thermography, Mirrors

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Proceedings Article | 15 July 2010 Paper

Design, performance, and early results from extremely high Doppler precision instruments in a global network

Jian Ge, Bo Zhao, John Groot, Liang Chang, Frank Varosi, Xiaoke Wan, Scott Powell, Peng Jiang, Kevin Hanna, Ji Wang, Rohan Pais, Jian Liu, Liming Dou, Sidney Schofield, Shaun McDowell, Erin Costello, Adriana Delgado-Navarro, Scott Fleming, Brian Lee, Sandeep Bollampally, Troy Bosman, Hali Jakeman, Adam Fletcher, Gabriel Marquez

Proceedings Volume 7735, 77350H (2010) https://doi.org/10.1117/12.857366

KEYWORDS: Planets, Telescopes, Doppler effect, Stars, Calibration, Spectrographs, Sensors, Spectral resolution, Interferometers, Iodine

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Proceedings Article | 10 September 2009 Paper

Monolithic interferometer for high precision radial velocity measurements

Xiaoke Wan, Jian Ge, Ji Wang, Brian Lee

Proceedings Volume 7424, 742406 (2009) https://doi.org/10.1117/12.825747

KEYWORDS: Interferometers, Phase shifts, Beam splitters, Calibration, Velocity measurements, Mirrors, Michelson interferometers, Stars, Exoplanets, Glasses

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Proceedings Article | 20 August 2009 Paper

A new generation multi-object Doppler instrument for the SDSS-III Multi-object APO Radial Velocity Exoplanet Large-area Survey

Jian Ge, Brian Lee, Nathan De Lee, Xiaoke Wan, John Groot, Bo Zhao, Frank Varosi, Kevin Hanna, Suvrath Mahadevan, Fred Hearty, Liang Chang, Jian Liu, Julian van Eyken, Ji Wang, Rohan Pais, Zhiping Chen, Alaina Shelden, Erin Costello

Proceedings Volume 7440, 74400L (2009) https://doi.org/10.1117/12.826651

KEYWORDS: Stars, Exoplanets, Planets, Interferometers, Doppler effect, Calibration, Spectrographs, Telescopes, Optical fibers, Germanium

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Proceedings Article | 11 July 2006 Paper

A new-generation multi-object high throughput Doppler instrument for a planet survey at the SDSS Telescope

Jian Ge, Xiaoke Wan, Bo Zhao, Abishek Hariharan, Suvrath Mahadevan, Julian van Eyken, Pengcheng Guo, Dan McDavitt, Curtis DeWitt, Roger Cohen, Scott Fleming, Stephen Kane, Justin Crepp, Stuart Shaklan

Proceedings Volume 6269, 62692E (2006) https://doi.org/10.1117/12.670856

KEYWORDS: Planets, Stars, Doppler effect, Telescopes, Exoplanets, Interferometers, Spectrographs, Sensors, Germanium, Prototyping

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Proceedings Article | 30 June 2006 Paper

A fiber feed system for a multiple object Doppler instrument at Sloan Telescope

Xiaoke Wan, Jian Ge, Pengcheng Guo, Bo Zhao, Lakshminarayan Hariharan, Daniel McDavitt

Proceedings Volume 6269, 62692T (2006) https://doi.org/10.1117/12.670858

KEYWORDS: Connectors, Telescopes, Doppler effect, Stars, Absorption, Exoplanets, Fiber couplers, Interferometers, Polishing, Coating

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Proceedings Article | 3 July 2003 Paper

Monitoring and multiplexing fiber Fabry-Perot interferometer sensors using a linearly tunable Er: fiber laser

Xiaoke Wan, Henry Taylor

Proceedings Volume 4974, (2003) https://doi.org/10.1117/12.478307

KEYWORDS: Sensors, Interferometers, Fiber optics sensors, Fiber lasers, Fourier transforms, Multiplexing, Signal detection, Modulation, Fabry–Perot interferometry, Erbium

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Showing 5 of 11 publications

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