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3 4 5 92 7 8 1061

3 4 5 92 7 8 1061

Pulse Pair

+ helicity pulse

− helicity pulse

COMPLEMENT

Timeslot

Timeslot

NEW

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SlowHelicityReversal

2 2 Argon Laser

R

P

2

P

R

Pockels Cell

Piezo−electric positioner

Linear Polarizer

Half−wave Plate

Rotatable Half−wave Plate

ChopperWheel

HPC

Path along electronbeam pipe to GaAsphotocathode

Ti:Saphire Laser

IPCSPC

CPC

IPC Intensity Pockels Cell

SPC Shutter Pockels Cell

CPC Correction Pockels Cell

Laser Beam

Optical Table

HPC Helicity Pockels Cell

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E�E 9

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2

SlowHelicityReversal

P2R

Low DivergenceRegion

Path toPhotocathode

VacuumWindow

2 Half−wave Plate

R Rotatable Half−wave Plate

Pockels Cell

Linear Polarizer

Converging Lens

P

HPC

BeamExpander

CPC

Diverging Lens

CPC Correction Pockels Cell

Laser Beam

Piezo−electric positioner

HPC Helicity Pockels Cell

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