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Proceedings Article

Breakthroughs in Silicon Grism and Immersion Grating Technology at Penn State

[+] Author Affiliations
Jian Ge, Daniel L. McDavitt, Shane Miller, John L. Bernecker, Abhijit Chakraborty

The Pennsylvania State Univ. (USA)

Junfeng Wang

The Pennslyvania State Univ. (USA)

Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 1006 (March 7, 2003); doi:10.1117/12.461163
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From Conference Volume 4841

  • Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
  • Masanori Iye; Alan F. M. Moorwood
  • Waikoloa, Hawai'i, United States | August 22, 2002

abstract

Fabrication of silicon grisms up to 2 inches in dimension has become a routine process at Penn State thanks to newly developed techniques in chemical etching, lithography and post-processing. The newly etched silicon grisms have typical rms surface roughness of ~ 9 nm with the best reaching 0.9 nm, significantly lower than our previous attempts (~ 20-30 nm). The wavefront quality of the etched gratings is high. Typical wavefront error is ~ 0.035 wave at 0.6328 micron, indicating diffraction-limited performance in the entire infrared wavelengths (1.2-10 microns) where silicon has excellent transmission. These processes have also significantly eliminated visible defects due to grating mask breaks during chemical etching. For the best grisms, we have less than 1 defect per cm2. The measured total integrated scatter is less than 1% at 0.6328 micron, indicating similar or lower scatter in the IR when grisms are operated in transmission. These new generation grisms are being evaluated with our Penn State near IR Imager and Spectrograph (PIRIS) in cryogenic temperature. We are applying the new techniques in etching an 80x40 mm2 grating on 30 mm thick substrate to make an anamorphic silicon immersion grating, which can provide a diffraction-limited spectral resolution of R = 220,000 at 2.2 micron. We plan to put this immersion grating in a modified PIRIS to measure magnetic field strength using the Fe I line at 1.56 micron among hundreds of nearby solar type stars to investigate the probability of the Maunder Minimum using the Mt. Wilson 100inch with adaptive optics in 2003.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Jian Ge ; Daniel L. McDavitt ; Shane Miller ; John L. Bernecker ; Abhijit Chakraborty, et al.
"Breakthroughs in Silicon Grism and Immersion Grating Technology at Penn State", Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 1006 (March 7, 2003); doi:10.1117/12.461163; http://dx.doi.org/10.1117/12.461163


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