2014
DOI: 10.1117/12.2055609
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The infrared imaging spectrograph (IRIS) for TMT: volume phase holographic grating performance testing and discussion

Abstract: Maximizing the grating efficiency is a key goal for the first light instrument IR.IS (Infrared Imaging Spectrograph) currently being designed to sample the diffraction limit of the TMT (Thirty Meter Telescope). Volume Phase Holographic (VPH) gratings have been shown to offer extremely high efficiencies that approach 100% for high line frequencies (i.e., 600 to 60001/mm), which has been applicable for astronomical optical spectrographs. However, VPH gratings have been less exploited in the near-infrared, partic… Show more

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Cited by 3 publications
(5 citation statements)
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“…The large differences in efficiency with polarization are not ubiquitous, however the RCWA analysis predicts a wide variability with wavelength. On the contrary, the VPH gratings exhibit a lower dependence of the efficiencies on polarization than the RD gratings 5 .…”
Section: Discussionmentioning
confidence: 84%
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“…The large differences in efficiency with polarization are not ubiquitous, however the RCWA analysis predicts a wide variability with wavelength. On the contrary, the VPH gratings exhibit a lower dependence of the efficiencies on polarization than the RD gratings 5 .…”
Section: Discussionmentioning
confidence: 84%
“…Within each polarization state the efficiency decreases by less than 10% when off the bragg angle by 3°. In contrast, the VPH gratings can exhibit a decrease in efficiency of greater than 20% when the incident angle is similarly changed 5 . This is very important to the design of IRIS as the gratings will be required to accept an incident angle difference of up to 4.4°8.…”
Section: Discussionmentioning
confidence: 93%
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“…Throughput and polarization testing was completed at the Dunlap Institute for Astronomy and Astrophysics during 2013 and early 2014. Preliminary results of this trade study are presented at this meeting (Chen et al 17 , Meyer et al 18 ).…”
Section: Gratingsmentioning
confidence: 97%
“…Two companies were used for each type of grating and were tested at infrared wavelengths with our selected field angles. 10,11 So the beams from the lenslet and slicer collimators are directed to strike a common rotating turret of ruled diffraction gratings at the same incident angles and thus are directed into the common camera optics to the detector.…”
Section: Hybrid Spectrographmentioning
confidence: 99%