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Slide1

Next Generation Lunar Laser Ranging

Alix

Preston*, Stephen Merkowitz, Jan McGarry, Thomas ZagwodzkiLUNAR Steering Committee MeetingApril 12, 2011

*supported in part by an appointment to the NASA

Posdoctoral

Program at Goddard Space Flight Center, administered by Oak Ridge Associated Universities through contract with NASASlide2

Hydroxide Bonding and Hollow Cubes

GSFC has been investigating in-house hollow corner cube developmentAttempting to use Hydroxide-Bonding techniques to bond mirrorsEasy: only need a small amount of hydroxide solution (typically KOH or sodium silicate)Strong: >1 MPa

in shearCan bond large surface areasWorks with a variety of materialsCan survive large temperature changesCurrently understanding how the hydroxide bond curesHow much does it change the angles between surfaces?

Two 1” mirrors bonded using the hydroxide bonding methodSlide3

Current Work

6-axis

piezo positioners that will be used to construct hollow corner cubes

1” corner cube produced using the

piezo

aligners and hydroxide bonding

Fabricated fixture to make corner cubes

Can accommodate larger facets already

2” fused silica facet flats have been ordered (arrive in May)

Alignment procedures/test protocols will be established once the cubes are made

Zerodur

facets will be ordered when this is completed

Optimizing the bonding process is underway

a few variations have been found already

Improvements were made to the far-field test bed

Transmit /receive optics simplified, fiber replaced spatial filter, larger off axis parabola with longer focal length, othersSlide4

Future Work Plan

Finish improvements to far-field test bed (almost done)Make and test 2” cubesAttempt to have first cube made in JuneDetermine how the FFDP changes after thermally cyclingCompare cubes using different bonding methodsPrepare report on 2” cubes

Procure 5”-6” facetsCurrently looking into possible vendorsMake and test larger corner cubesPrepare report on larger cube results

FFDP of an optical flat (left) and spare LAGOES 2 corner cube (right) using the improved setup. Quality is limited by air currents and vibrations

Construction of the light-tight enclosure to reduce air turbulence

By: danika-pritchard
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Next Generation Lunar Laser Ranging - Description


Alix Preston Stephen Merkowitz Jan McGarry Thomas Zagwodzki LUNAR Steering Committee Meeting April 12 2011 supported in part by an appointment to the NASA Posdoctoral Program at Goddard Space Flight Center administered by Oak Ridge Associated Universities through contract with N ID: 425606 Download Presentation

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