Quantum efficiency characterization of back-illuminated CCDs: Part II. Reflectivity measurements

Maximilian H. Fabricius; Chris J. Bebek; Donald E. Groom; Armin Karcher; Natalie A. Roe

doi:10.1117/12.667314

6 February 2006 Quantum efficiency characterization of back-illuminated CCDs: Part II. Reflectivity measurements

Maximilian H. Fabricius, Chris J. Bebek, Donald E. Groom, Armin Karcher, Natalie A. Roe

Proceedings Volume 6068, Sensors, Cameras, and Systems for Scientific/Industrial Applications VII; 60680G (2006) https://doi.org/10.1117/12.667314
Event: Electronic Imaging 2006, 2006, San Jose, California, United States

Abstract

The usual QE measurement heavily relies on a calibrated photodiode (PD) and the knowledge of the CCD's gain. Either can introduce significant systematic errors. But 1-R ≥QE, where R is the reflectivity. Over a significant wavelength range, 1-R = QE. An unconventional reflectometer has been developed to make this measurement. R is measured in two steps, using light from the lateral monochromator port via an optical fiber. The beam intensity is measured directly with a PD, then both the PD and CCD are moved so that the optical path length is unchanged and the light reflects once from the CCD; the PD current ratio is R. Unlike the traditional VW scheme this approach makes only one reflection from the CCD surface. Since the reflectivity of the LBNL CCDs might be as low as 2% this increases the signal to noise ratio dramatically. The goal is a 1% accuracy. We obtain good agreement between 1 - R and the direct QE results.

Citation Download Citation

Maximilian H. Fabricius, Chris J. Bebek, Donald E. Groom, Armin Karcher, and Natalie A. Roe "Quantum efficiency characterization of back-illuminated CCDs: Part II. Reflectivity measurements", Proc. SPIE 6068, Sensors, Cameras, and Systems for Scientific/Industrial Applications VII, 60680G (6 February 2006); https://doi.org/10.1117/12.667314

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available