Optical scramblers

Inactive Publication Date: 2017-02-16
PENN STATE RES FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]This disclosure features optical scramblers that can be used with spectrographs and other optical measurement systems, including Doppler-based radial velocity measurement systems and other precision spectroscopy. The scramblers typically include an optic

Problems solved by technology

Detecting extrasolar planetary Earth analogs via radial velocity measurements has proved to be challenging, in part due to the levels of Doppler precision that are expected to be required to detect such planets.
One of the major technical challenges in improving the stability of these instruments is stabilizing the instrument illumination.
Conventional slit-fed spectrographs have instrument point-spread functions (PSF) that vary significantly with seeing conditions and telescope guiding variability, thus limiting their ultimate RV precision.
This is particularly an issue for fiber-fed Doppler RV instruments

Method used

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[0042]Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION

Introduction

[0043]High precision spectroscopic measurement systems are often used to conduct sensitive, low-light measurements such as galactic and extra-galactic planetary surveys and other astrophysical investigations at visible and / or near-infrared wavelengths. Many such systems perform Doppler-based radial velocity measurements in an effort to reliably identify targets at great distances from these Earth-based systems. The Habitable-zone Planet Finder spectrograph is one example of such a system.

[0044]In these high precision systems, step-index multimode fibers have been used as optical image scramblers to decouple the distribution of flux in an output beam from an illumination pattern at a telescope focal plane. In agreement with theory, repeated laboratory tests show that standard circular fibers yield a high degree of azimuthal scrambling, but minimal radial scrambling. Fibers with

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Abstract

The disclosure features optical scramblers that can be used with spectrographs and other optical measurement systems, including Doppler-based radial velocity measurement systems and other precision spectroscopy. In one aspect, an optical scrambler includes a first fiber configured to receive measured light from an optical collection system, a second fiber configured to deliver the measured light to a detection system, and an optical coupling element positioned between a light output surface of the first fiber and a light input surface of the second fiber and configured to deliver the measured light from the first fiber to the second fiber. The coupling element defines an output focal position for the measured light that is delivered to the second fiber and the output focal position is located within 50 microns of an output surface of the coupling element.

Description

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Claims

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Application Information

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Owner PENN STATE RES FOUND
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