1998 Fiscal Year Final Research Report Summary
Trial Manufacturing of An InGaAs 2-D Detector Array for Astronomical Observations
| Project/Area Number |
09354002
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Astronomy
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| Research Institution | Nagoya University |
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Principal Investigator |
NAGATA Tetsuya Nagoya University, Department of Physics, Assoc.Professor, 大学院・理学研究科, 助教授 (80208016)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Akimasa Hamamatsu Photonics, KK., Solid State Div., Section Manager, 固体事業部, グループ長代理(研究
SATO Shuji Nagoya University, Department of Physics, Professor, 大学院・理学研究科, 教授 (50025483)
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| Project Period (FY) |
1997 – 1998
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| Keywords | photovoltaic detector / integrating amplifier / dark current |
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| Research Abstract |
InGaAs photovoltaic detectors have been developed and evaluated. Comparison of InGaAs with other detectors has been made. We have completed the evaluation of one dimensional arrays in laboratories and at a telescope, and have not proceeded to development of a two dimensional array. [Dark current and quantum efficiency] The temperature dependence of dark current of single and 16-ch array InGaAs detectors was measured from a room temperature to 200K and 95K, respectively. The dark current shows sufficient decrease at 95K, but the quantum efficiency of the detector for long wavelength radiation decreases there ; its cutoff wavelength decreases from 1.7 mum (room temperature) to 1.55 mum (95K) . [Evaluation at telescope] An 128-ch InGaAs array was on the Nagoya University 50-cm telescope with optical fibers and a grating to make a spectrometer with spectral resolution of lambda/DELTAlambdaSOOO.We obtained spectra of bright stars at 1.3 mum, which show the Pa beta absorption and telluric absorptions. [Comparison with other detectors] An electronics system which can drive two dimensional arrays has been developed ; its speed and noise characteristics are sufficient for detector arrays of astronomical use. In comparison with other arrays, we conclude that InGaAs has merits such as low dark current and high operation temperature, but that the decrease of its efficiency at 1.55 mum poses a difficulty in astronomical applications.
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