Max Planck Institute Gravitational Physics · Albert Einstein Institute 7th International LISA...

Albert Einstein Institute

www.lisa.aei-hannover.de

LISA Technology II – June 18, 2008 / 15:30 h7th International LISA Symposium – Barcelona, Spain / June 16-20, 2008

HannoverMax Planck InstituteforGravitational Physics

LISA Technology II – June 18, 2008 / 17:15 h7th International LISA Symposium – Barcelona, Spain / June 16-20, 2008

Measurement of the nonreciprocal phase noise of a singlemode polarization maintaining optical fiber

R. Fleddermann, F. Steier, M. Tröbs, G. Heinzel and K. Danzmann

LISA Group AEI Hannover, Germany Roland Fleddermann, June 18, 2008http://www.lisa.aei-hannover.de/ 7th International LISA Symposium – LISA Technology II

Measurement of the nonreciprocal phase noise of a single mode polarization maintaining optical fiber

Fiber reciprocity

• Desirable to exchange light between two optical benches

• Benches move fiber• Fiber introduces reciprocal

phase noise, but can be subtracted

• Nonreciprocal phase noise can not be subtracted

• Possible sources• Travel time effects • Light in wrong fiber axis• Reflections at fiber ends• … ?

Tests of the reciprocity

• Two possibilities:• Sagnac• LISA-like

• First experiments using sagnac setup• Phasenoise above LISA requirements• Reduction not possible

LISA-like setup

Initial Sagnac results

• Noise Level of about

observed• External influences investigated:

• Fiber temperature• Electronic noise• Polarization inside fiber• Reciprocity• Coherence length• Backscatter• Temperature of EOM

Hzrad/ 3103 −⋅

LISA-like setup

• Sagnac does not show required performance• Switch to setup closer to actual LISA application

LISA like setup

• Improvements:• LISA Pathfinder laser system• Vacuum• Matched path lengths• New photodiode amplifiers

Comparison of spectra

Pathlength noise

• Setup sensitve to changes in pathlength

• Simple IFO for comparison• Heterodyne Mach-Zehnder• 10 cm Armlength

• Measure pathlength noise• Add.: Measurement w/o fiber

Zerodur Mach-Zehnder

Pathlength noise

Measurements without fiber

Zerodur Interferometer

• Aluminum limits pathlength noiseZerodur

First results with Zerodur Interferometer

Still way above requirements, even worse than Sagnac results

Improvements

• Straylight correction• Pi measurements high noise level• Straylight must enter measurement

Effect of straylight correction

Polarization control

• Polarization must match fiber axis• Different indices of refraction act like waveplate• Output polarization state will generally be elliptic and time dependant

• Introduce polarizers into zerodur setup• Alignment is difficult• Polarimeter needed

Null measurement

• Measurement without fiber• Foreseen in design of Zerodur IFO• Shows noise of setup

Summary

Conclusions/Outlook

• Requirements not (yet) fulfilled• Made good progress• Nonreciprocity observed still limited by setup• Backreflection identified as noise source

• Possible ways of improvement• Less backreflection (couplers, lenses, fibers, alignment)• Better polarization alignment/control

• Next steps• Investigate backreflection• Try other fiber couplers (LPF Fiber injector prototypes?)• Improve polarization alignment (Polarimeter)• Other fibers• Fiber temperature/length stabilization

ThankThank youyou forfor youryour attentionattention

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