Deastigmatism and Circularization of an Elliptical Gaussian Beam by Off-Axis Ellipsoid Reflector Based Off-Focus Configuration

Yang, Shan; Bai, Ming; Miao, Jungang

doi:10.2528/pierb08090502

Cited by 1 publication

(2 citation statements)

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“…In this treatment the beam is thus defined with two sets of independently evolving Gaussian beam parameters. In this work, we expand upon previous works addressing this issue [4], [8]- [10], where astigmatism is defined solely in terms of mismatched beam amplitude radii in the transverse orthogonal directions, with the mismatched phase radii of curvature not being addressed. The resultant beams can thus not be considered as truly stigmatic i.e., where , and .…”

Section: Correction Of An Astigmatic Gaussian Beammentioning

confidence: 99%

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A Compensating Anastigmatic Submillimeter Array Imaging System for STEAMR

Whale

Murphy

Murk

et al. 2013

IEEE Trans. THz Sci. Technol.

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In this paper, we present a novel technique for the removal of astigmatism in submillimeter-wave optical systems through employment of a specific combination of so-called astigmatic off-axis reflectors. This technique treats an orthogonally astigmatic beam using skew Gaussian beam analysis, from which an anastigmatic imaging network is derived. The resultant beam is considered truly stigmatic, with all Gaussian beam parameters in the orthogonal directions being matched. This is thus considered an improvement over previous techniques wherein a beam corrected for astigmatism has only the orthogonal beam amplitude radii matched, with phase shift and phase radius of curvature not considered. This technique is computationally efficient, negating the requirement for computationally intensive numerical analysis of shaped reflector surfaces. The required optical surfaces are also relatively simple to implement compared to such numerically optimized shaped surfaces. This technique is implemented in this work as part of the complete optics train for the STEAMR antenna. The STEAMR instrument is envisaged as a mutli-beam limb sounding instrument operating at submillimeter wavelengths. The antenna optics arrangement for this instrument uses multiple off-axis reflectors to control the incident radiation and couple them to their corresponding receiver feeds. An anastigmatic imaging network is successfully implemented into an optical model of this antenna, and the resultant design ensures optimal imaging of the beams to the corresponding feed horns. This example also addresses the challenges of imaging in multi-beam antenna systems.

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Section: Correction Of An Astigmatic Gaussian Beammentioning

confidence: 99%

“…The resultant beams can thus not be considered as truly stigmatic i.e., where , and . In order to produce the desired stigmatic beam, more degrees of freedom are required in the optical train than those put forth in [4], [8]- [10], all of which utilize only a single phase transforming element.…”

Section: Correction Of An Astigmatic Gaussian Beammentioning

confidence: 99%