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Optimised CCD Anti-Reflection Coating

Optimised CCD Anti-Reflection Coating. Backthinned CCDs normally use a single wavelength antireflection coating to maximise QE E2v designed custom evaporation technique to allow a graded AR coating Test results – Optimised spectral response from 300-1000 nm along 60mm length of the sensor.

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Optimised CCD Anti-Reflection Coating

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  1. Optimised CCD Anti-Reflection Coating • Backthinned CCDs normally use a single wavelength antireflection coating to maximise QE • E2v designed custom evaporation technique to allow a graded AR coating • Test results – • Optimised spectral response from 300-1000 nm along 60mm length of the sensor. • Reduction of fringes when minimum reflection matches illuminated wavelength. • Results of spectral response, reflectivity, and fringe amplitudes are presented. Graded thickness AR coating (for fixed-format spectroscopy) Andrew Kelt, Andrew Harris and Paul Jorden E2V Technologies, 106, Waterhouse Lane, Chelmsford, Essex, CM1 2QU, United Kingdom Simon Tulloch Isaac Newton Group, Apartado De Correos 321, 38700 Santa Cruz de La Palma, Islas Canarias, SPAIN

  2. Sample CCD44-82 with graded coating This side of CCD is optimised for the red This side of CCD is optimised for the blue Optimised CCD Anti-Reflection Coating

  3. Optimised CCD Anti-Reflection Coating

  4. Optimised CCD Anti-Reflection Coating Optimised spectral response cf fixed wavelength AR coat [Curves are for deep depletion CCD] Please see poster for all the other data. Thanks! • SUMMARY • Low reflectivity = High QE Optimises QE across full wavelength range. • Low reflectivity in the red = Low fringing Reduced fringes at red wavelengths • AR coat can be matched to spectrograph output. Ideal choice for Fixed Format Spectrographs.

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