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

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

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apopt..45.6982p&link_type=abstract

Applied Optics IP, vol. 45, Issue 27, pp.6982-6989

Physics

Optics

11

Polarimetry, Optical Devices, Polarization-Sensitive Devices, Polarization, Astronomical Optics

Scientific paper

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.

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