CCD-world: Absolute QE measurments

[Don Groom]

The following was posted to CCD-world:

At ESO99 there was some discussion about the absolute accuracy of QE 
measurments. We have three pieces of input, the first two thanks to
Armin Karchar of our group:

1. Communication with Hamamatsu:
Date: Mon, 8 Nov 1999 12:55:20 -0500
From: Chris DePalma <cdepalma at hamamatsu.com>
Subject: Accuracy of PD calibration
Here is the calibration accuracy of the sens in each wavelength range.
    200 -  400nm      +/-10%
    400 - 1000nm      +/- 5%
   1000 - 1200nm      +/-10%

2. Melles Griot spec sheets, http://www.mellesgriot.com/pdf/550.pdf
At the bottom, it says "13 DAS 011.C offers NIST traceability from 400
to 1100 nm at 10 nm intervals. Absolute accuracy of the calibration is
+/- < 5%."

3. Recent Lick measurements of both QE and reflectivity for our CCDs:
1-R agrees with QE (refered to Hamamatsu calibrated photodiodes) at
about the 2% level for our CCD's at 700, 800, and 900 nm, where
agreement would be expected. (The 1-R point looks wrong at 600 nm.)
Ref: R. Stover's ESO99 contribution, available on http://ccd.lbl.gov.

I suspect that 5% is a bit pessimistic, but safe.

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Don Groom deg at lbl.gov (Particle Data Group, Supernova Cosmology Project)
http://ccd.lbl.gov   Voice: 510/486-6788 FAX: 510/486-4799
Analog: 50-6008//Berkeley Lab//Berkeley, CA 94720
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