2008
DOI: 10.1117/12.789930
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The Keck-I Cassegrain ADC

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Cited by 5 publications
(3 citation statements)
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“…Exceptions were usually at an airmass <1.2 or when the slit was positioned at a specific angle to include a second object (the host‐galaxy nucleus, a trace star, a second SN, etc.). In 2007 August, LRIS was retrofitted with an atmospheric dispersion corrector (ADC; Phillips et al ). With the ADC, differential light loss is substantially reduced regardless of position angle, even at high airmass.…”
Section: Observationsmentioning
confidence: 99%
“…Exceptions were usually at an airmass <1.2 or when the slit was positioned at a specific angle to include a second object (the host‐galaxy nucleus, a trace star, a second SN, etc.). In 2007 August, LRIS was retrofitted with an atmospheric dispersion corrector (ADC; Phillips et al ). With the ADC, differential light loss is substantially reduced regardless of position angle, even at high airmass.…”
Section: Observationsmentioning
confidence: 99%
“…It is very easy to e-beam and appears to be moisture-resistant in our tests. We are currently evaluating protected Ag coatings using YF 3 and an oxide (HfO 2 , Zr-Ti oxide or Zr-Ta oxide). These coatings have reflectance R > 90% for λ > 340 nm, R > 95.5% for λ > 400 nm, and R ~ 98.5% at 2 μm.…”
Section: New Materialsmentioning
confidence: 99%
“…Maximum correction is when the prisms are spaced furthest apart; at zero spacing the system becomes a simple plate with no dispersion. The linear ADC can be made with simple prisms (for example, in the Keck Cassegrain ADC 5 ), although in this case it displaces the optical axis of the system as the prisms separate, so zero-deviation compound prisms are usually chosen (as in, for example, the Gemini Planet Imager 6 ). This design introduces a small amount of spherical aberration and some "constant" coma.…”
Section: Choice Of Adc Designmentioning
confidence: 99%