A translational polarization rotator

Chuss, David T.; Wollack, Edward J.; Pisano, G.; Ackiss, S. E.; U-yen, Kongpop; Ng, Ming Wah

doi:10.1364/ao.51.006824

Cited by 18 publications

(10 citation statements)

References 15 publications

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“…Table 1). In such a design, known as a dual variable-delay polarization modulator (dual VPM), the system can be kept free from unwanted oscillations by using piezo-electric actuators (the translational polarization rotator introduced by Chuss et al [2012b] is a further development). It seems fair to say that in both approaches the stability requirement makes the system more complex, either by adding a second VPM, or, as in our case, an air-bearing.…”

Section: Measurement Equationmentioning

confidence: 99%

Submillimeter Polarimetry with PolKa, a Reflection-Type Modulator for the APEX Telescope

Wiesemeyer¹,

Hezareh²,

Kreysa³

et al. 2014

Publications of the Astronomical Society of the Pacific

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Imaging polarimetry is an important tool for the study of cosmic magnetic fields. In our Galaxy, polarization levels of a few up to ∼10% are measured in the submillimeter dust emission from molecular clouds and in the synchrotron emission from supernova remnants. Only few techniques exist to image the distribution of polarization angles as a means of tracing the plane-of-sky projection of the magnetic field orientation. At submillimeter wavelengths, polarization is either measured as the differential total power of polarization-sensitive bolometer elements, or by modulating the polarization of the signal. Bolometer arrays such as LABOCA at the APEX telescope are used to observe the continuum emission from fields as large as ∼0:°2 in diameter. Here we present PolKa, a polarimeter for LABOCA with a reflection-type waveplate of at least 90% efficiency. The modulation efficiency depends mainly on the sampling and on the angular velocity of the waveplate. For the data analysis, the concept of generalized synchronous demodulation is introduced. The instrumental polarization toward a point source is at the level of ∼0:1%, increasing to a few percent at the À10 db contour of the main beam. A method to correct for its effect in observations of extended sources is presented. Our map of the polarized synchrotron emission from the Crab nebula is in agreement with structures observed at radio and optical wavelengths. The linear polarization measured in OMC1 agrees with results from previous studies, while the high sensitivity of LABOCA enables us to also map the polarized emission of the Orion Bar, a prototypical photon-dominated region.

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Section: Measurement Equationmentioning

confidence: 99%

Submillimeter Polarimetry with PolKa, a Reflection-Type Modulator for the APEX Telescope

Wiesemeyer¹,

Hezareh²,

Kreysa³

et al. 2014

Publications of the Astronomical Society of the Pacific

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“…a device that refiects right-handed circular polarization while transmitting its left-handed counterpart. Chuss et al 20 have synthesized a circular polarizer out of a metal mesh quarter-wave plate 21 placed in front of a wire grid polarizer such that the wires are oriented at 45° with respect to the fast (or slow) axis of the wave-plate. Preliminary measurements have been reported elsewhere and verify the basic principle.…”

Section: Methodsmentioning

confidence: 99%

Phase-controlled polarization modulators

Chuss

Wollack

Novak³

et al. 2012

SPIE Proceedings

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We report technology development of millimeter /submillimeter polarization modulators that operate by introdGcing a variable, controlled phase delay between two orthogonal polarization states. The variable-delay polarization modulator (VPM) operates via the introduction of a variable phase deiay between two linear orthogonal polarization states, resulting in a variable mapping of a single. linear polarization into a combination of that Stokes parameter and circular (Stokes V) polarization. Characterization of a prototype VP1! is presented at 350 and 3000 microns. We also describe a modulator in which a variable phase delay is introduced between rigl:t-and left-circular polarization states. In this architecture, linear polarization is fully modulated. Each of these devices consists of a polarization diplexer parallel to and in front of a movable mirror. Modulation involves sub-wavelength translations of the mirror that change the magnitude of the phase delay.

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“…The data analysis is identical to that for previously published results. 22 Figure 8 shows the single frequency polarization transfer function from 76-117 GHz. For each grid-mirror separation, a polarization spectrum is obtained.…”

Section: Grid Polarization Efficiencymentioning

confidence: 99%

Variable-delay polarization modulators for cryogenic millimeter-wave applications

Chuss

Eimer

Fixsen

et al. 2014

Review of Scientific Instruments

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We describe the design, construction, and initial validation of the variable-delay polarization modulator (VPM) designed for the PIPER cosmic microwave background polarimeter. The VPM modulates between linear and circular polarization by introducing a variable phase delay between orthogonal linear polarizations. Each VPM has a diameter of 39 cm and is engineered to operate in a cryogenic environment (1.5 K). We describe the mechanical design and performance of the kinematic double-blade flexure and drive mechanism along with the construction of the high precision wire grid polarizers.

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A translational polarization rotator

Cited by 18 publications

References 15 publications

Submillimeter Polarimetry with PolKa, a Reflection-Type Modulator for the APEX Telescope

Submillimeter Polarimetry with PolKa, a Reflection-Type Modulator for the APEX Telescope

Phase-controlled polarization modulators

Variable-delay polarization modulators for cryogenic millimeter-wave applications

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