Mr. R. Elliot Meyer Profile

R. Elliot Meyer

PhD Candidate at Univ of Toronto

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Publications (6)

PROCEEDINGS ARTICLE | July 10, 2018

The wide integral field infrared spectrograph: commissioning results and on-sky performance

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Telescopes, Optical filters, Spectrographs, Stars, Sensors, Calibration, Imaging spectroscopy, Infrared spectroscopy, Infrared radiation, Galactic astronomy

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PROCEEDINGS ARTICLE | August 9, 2016

The Wide Integral Field Infrared Spectrograph (WIFIS): optomechanical design and development

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

KEYWORDS: Near infrared, Telescopes, Mirrors, Spectrographs, Cameras, Sensors, Calibration, Copper, Space telescopes, Galactic astronomy

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PROCEEDINGS ARTICLE | August 6, 2014

The Infrared Imaging Spectrograph (IRIS) for TMT: instrument overview

Proc. SPIE. 9147, Ground-based and Airborne Instrumentation for Astronomy V

KEYWORDS: Diffraction, Telescopes, Spectrographs, Astronomy, Stars, IRIS Consortium, Thirty Meter Telescope, Imaging systems, Adaptive optics, Cryogenics

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PROCEEDINGS ARTICLE | July 28, 2014

The infrared imaging spectrograph (IRIS) for TMT: volume phase holographic grating performance testing and discussion

Proc. SPIE. 9147, Ground-based and Airborne Instrumentation for Astronomy V

KEYWORDS: Diffraction, Spectrographs, Optical design, Astronomy, IRIS Consortium, Thirty Meter Telescope, Modulation, Polarization, Spectral resolution, Diffraction gratings

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PROCEEDINGS ARTICLE | July 28, 2014

The infrared imaging spectrograph (IRIS) for TMT: reflective ruled diffraction grating performance testing and discussion

Proc. SPIE. 9147, Ground-based and Airborne Instrumentation for Astronomy V

KEYWORDS: Diffraction, Spectrographs, Optical design, Astronomy, IRIS Consortium, Polarization, Cameras, Reflectivity, Spectral resolution, Diffraction gratings

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We present the efficiency of near-infrared reflective ruled diffraction gratings designed for the InfraRed Imaging Spectrograph (IRIS). IRIS is a first light, integral field spectrograph and imager for the Thirty Meter Telescope (TMT) and narrow field infrared adaptive optics system (NFIRAOS). IRIS will operate across the near-infrared encompassing the ZYJHK bands (~0.84 - 2.4μm) with multiple spectral resolutions. We present our experimental setup and analysis of the efficiency of selected reflective diffraction gratings. These measurements are used as a comparison sample against selected candidate Volume Phase Holographic (VPH) gratings (see Chen et al., this conference). We investigate the efficiencies of five ruled gratings designed for IRIS from two separate vendors. Three of the gratings accept a bandpass of 1.19-1.37μm (J band) with ideal spectral resolutions of R=4000 and R=8000, groove densities of 249 and 516 lines/mm, and blaze angles of 9.86° and 20.54° respectively. The other two gratings accept a bandpass of 1.51-1.82μm (H Band) with an ideal spectral resolution of R=4000, groove density of 141 lines/mm, and blaze angle of 9.86°. The fraction of flux in each diffraction mode was compared to both a pure reflection mirror as well as the sum of the flux measured in all observable modes. We measure the efficiencies off blaze angle for all gratings and the efficiencies between the polarization transverse magnetic (TM) and transverse electric (TE) states. The peak reflective efficiencies are 98.90 ± 3.36% (TM) and 84.99 ± 2.74% (TM) for the H-band R=4000 and J-band R=4000 respectively. The peak reflective efficiency for the J-band R=8000 grating is 78.78 ± 2.54% (TE). We find that these ruled gratings do not exhibit a wide dependency on incident angle within ±3°. Our best-manufactured gratings were found to exhibit a dependency on the polarization state of the incident beam with a ~10-20% deviation, consistent with the theoretical efficiency predictions. This work will significantly contribute to the selection of the final grating type and vendor for the IRIS optical system, and are also pertinent to current and future near-infrared astronomical spectrographs.

PROCEEDINGS ARTICLE | July 8, 2014

A near-infrared SETI experiment: instrument overview

Proc. SPIE. 9147, Ground-based and Airborne Instrumentation for Astronomy V

KEYWORDS: Telescopes, Optical filters, Astronomy, Avalanche photodetectors, Stars, Radio optics, Cameras, Sensors, Signal detection, Pulsed laser operation

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