Physics – Optics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.3004e&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #30.04; Bulletin of the American Astronomical Society, Vol. 30, p.1290
Physics
Optics
Scientific paper
My thesis work spanned over the design, building, testing and commissioning of a novel ground based astronomical instrument, COHSI, the Cambridge OH Suppression Instrument, which will be used in the next few years in the field of near infrared faint object spectroscopy. COHSI filters out the bright near infrared (1.0-1.8 micron) sky background using special suppression masks to enable integral field and multi-object nightsky suppressed spectroscopy down to J>20, H>19. The thesis involves a discussion of the scientific motivation for undertaking the construction of a complicated instrument (Chapter 1), an investigation of the near infrared night sky and its impact on instrument sensitivity (Chapter 2), a discussion of the potential sensitivity gains and design restrictions for a hardware suppression instrument (Chapter 3), an analysis of the optical design of COHSI (Chapter 4), and a detailed review of the major components of COHSI (e.g., optics, cryogenics, detectors) (Chapters 5,7,8). In particular, mention is made for a new technique of fabricating OH suppression masks which we developed in our lab (Chapter 6). Discussion of the instrument's performance during its commissioning on the United Kingdom Infrared Telescope on Mauna Kea, Hawaii, in March 1998 is given (Chapter 9). The thesis concludes with a summary of the next steps in COHSI's instrument development as well as future paths for near infrared sky background reduction in the age of larger detectors and telescope facilities (Chapter 10).
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