An infrared beam combiner for wavelength bootstrapping at the NPOI

J. Thomas Armstrong; Henrique R. Schmitt; Sergio R. Restaino; Ellyn K. Baines; Gerard T. van Belle

doi:10.1117/12.2312284

9 July 2018 An infrared beam combiner for wavelength bootstrapping at the NPOI

J. Thomas Armstrong, Henrique R. Schmitt, Sergio R. Restaino, Ellyn K. Baines, Gerard T. van Belle

Proceedings Volume 10701, Optical and Infrared Interferometry and Imaging VI; 107010B (2018) https://doi.org/10.1117/12.2312284
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Since 1994, the Navy Precision Optical Interferometer (NPOI) has operated at visual wavelengths (450 to 850 nm). Its primary Classic backend is a pupil-plane combiner that disperses the light at a resolution R ≈ 50, uses avalanche photo-diodes as photon-counting detectors, and scans interference fringes by modulating the delay at 1 kHz. The newer NPOI image-plane combiner, VISION (Tennessee State University), which is similar to CHARA’s MIRC and is currently being upgraded, dispenses with delay modulation. We are now developing a third backend to expand into the near infrared. Its primary purpose will be to stabilize the NPOI for high-resolution observations by bootstrapping from the infrared to visual wavelengths.

Conference Presentation

Citation Download Citation

J. Thomas Armstrong, Henrique R. Schmitt, Sergio R. Restaino, Ellyn K. Baines, and Gerard T. van Belle "An infrared beam combiner for wavelength bootstrapping at the NPOI", Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107010B (9 July 2018); https://doi.org/10.1117/12.2312284

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