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Achromatic half-wave plate for submillimeter instruments in cosmic microwave background astronomy: experimental characterization

Pisano, Giampaolo, Savini, Giorgio, Ade, Peter A. R., Haynes, Vic and Gear, Walter Kieran 2006. Achromatic half-wave plate for submillimeter instruments in cosmic microwave background astronomy: experimental characterization. Applied Optics 45 (27) , pp. 6982-6989. 10.1364/AO.45.006982

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Abstract

An achromatic half-wave plate (HWP) to be used in millimeter cosmic microwave background (CMB) polarization experiments has been designed, manufactured, and tested. The design is based on the 5-plates Pancharatnam recipe and it works in the frequency range 85–185 GHz . A model has been used to predict the transmission, reflection, absorption, and phase shift as a function of frequency. The HWP has been tested by using coherent radiation from a back-wave oscillator to investigate its modulation efficiency and with incoherent radiation from a polarizing Fourier transform spectrometer (FTS) to explore its frequency behavior. The FTS measurements have been fitted with an optical performance model which is in excellent agreement with the data. A detailed analysis of the data also allows a precise determination of the HWP fast and slow axes in the frequency band of operation. A list of the HWP performance characteristics is reported including estimates of its cross polarization.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: The Optical Society of America
ISSN: 0003-6935
Last Modified: 04 Jun 2017 04:16
URI: http://orca.cf.ac.uk/id/eprint/35821

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