Electro-Optical Modulation Nonlinear Optics Techniques Self Focussing

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Presentation transcript:

LCLS Drive Laser Stabilization using Feed-Forward Techniques Axel Brachmann, SLAC November 20, 2003 Electro-Optical Modulation Nonlinear Optics Techniques Self Focussing Two Photon Absorption LCLS Drive Laser Review, November 20, 2003 Axel Brachmann, SLAC

Electro-Optical Modulation Principle of operation Pockels cell / polarizer cube as intensity modulator Modulation of Pockels cell retardation based on laser intensity monitor Adjustable delay line using fast pockels cells to compensate for propagation delay of HV pulser LCLS Drive Laser Review, November 20, 2003 Axel Brachmann, SLAC

Electro-Optical Modulation Layout Input beam Photodiode Pulse stretcher Faraday Isolator Wedged window (Pick off) /2 Switch out Pockels cell Switch in Pockels cell PBS Adjustable Delay Line /4 (optical bias) Modulating Pockels cell HV Amplifier PBS LCLS Drive Laser Review, November 20, 2003 Axel Brachmann, SLAC

Modulating Pockels Cell and Driver SLAC built device Propagation delay: 50 to 100 ns SLAC built HV amplifier Uses commercial Pockels cell Previous use for E158 temporal laser pulse shaping LCLS Drive Laser Review, November 20, 2003 Axel Brachmann, SLAC

EO Feed-Forward Simulation (I) Pockels cell transmitted intensity: Pockels cell phase shift: : phase shift b: Phase shift introduced by optical bias n0: refractive index 63: electro-optical constant Vz: applied voltage pulse LCLS Drive Laser Review, November 20, 2003 Axel Brachmann, SLAC

EO Feed-Forward Simulation (II) LCLS Drive Laser Review, November 20, 2003 Axel Brachmann, SLAC

Feed forward cost estimate Item Qty. Unit cost Ext. Cost Manufacturer Faraday isolator 1 5,000 OFR IO-5-532-VHP window 190 CVI Lasers ELW-25.4-6.35-UV telescope lenses for beam diameter adjustment 2 220 440 BICX-25.4-XXX-C-532(1) half wave plate to maximize transmission 480 QWPO-532-10-2-R15 clean up polarizer 270 PBS-532-100 delay line polarizer 540 delay line Pockels cells and pulser 9,300 18,600 Laser Metrics 5046E (Pulser) Q1059P-12-532-SG (Pockels cell) delay line end mirrors 195 390 Y2-1037-0-2.00CC delay line folding mirrors 130 260 Y2-1037-45-S optical bias quarter wave plate QWPO-532-10-4-R15 modulating PC and pulser (SLAC build) 10,000 SLAC N/A polarizer past modulating PC Total: 36920 LCLS Drive Laser Review, November 20, 2003 Axel Brachmann, SLAC

Fast forward experimental timeline Activity Month 1 Month 2 Month 3 Month 4 Month 5 Test Amplification of photodiode signal Photodiode Signal conditioning (level/timing) Setup of delay line Setup of modulation system Experimental evaluation of system LCLS Drive Laser Review, November 20, 2003 Axel Brachmann, SLAC