منابع مشابه
MAXIPOL’s Half Wave Plate Polarimetry
MAXIPOL was the first experiment to measure the polarization of the cosmic microwave background with a rotating half wave plate. We discuss the magnitude and sources for instrumental polarization and polarization rotation in the instrument.
متن کاملA Millimeter-Wave Achromatic Half Wave Plate
We have constructed an achromatic half wave plate (AHWP) suitable for the millimeter wavelength band. The AHWP was made from a stack of three sapphire a-cut birefringent plates with the optical axes of the middle plate rotated by 50.5 degrees with respect to the aligned axes of the other plates. The measured modulation efficiency of the AHWP at 110 GHz was 96 ± 1.5%. In contrast, the modulation...
متن کاملMillimeter-wave achromatic half-wave plate.
We have constructed an achromatic half-wave plate (AHWP) suitable for the millimeter wavelength band. The AHWP was made from a stack of three sapphire a-cut birefringent plates with the opticalaxes of the middle plate rotated by 50.5 deg with respect to the aligned axes of the other plates. The measured modulation efficiency of the AHWP at 110 GHz was 96 +/- 1.5%. In contrast, the modulation ef...
متن کاملMulti-octave metamaterial reflective half-wave plate for millimeter and sub-millimeter wave applications.
The quasi-optical modulation of linear polarization at millimeter and sub-millimeter wavelengths can be achieved by using rotating half-wave plates (HWPs) in front of polarization-sensitive detectors. Large operational bandwidths are required when the same device is meant to work simultaneously across different frequency bands. Previous realizations of half-wave plates, ranging from birefringen...
متن کاملElectron Drift Velocity and Ultrafast Gaseous Switching
Ultrafast switching (100 ps domain) depends on extremely fast electrical pulses generated by mm spark gaps at high gas pressure (typically H2). The electron drift velocity under such breakdown conditions is too slow to explain the observed switching times. A type of experiment is suggested.
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ژورنال
عنوان ژورنال: Optics Express
سال: 2008
ISSN: 1094-4087
DOI: 10.1364/oe.16.007564