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Electro-Optical Modulation Nonlinear Optics Techniques Self Focussing Two Photon Absorption

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. Electro-Optical Modulation. Principle of operation

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Electro-Optical Modulation Nonlinear Optics Techniques Self Focussing Two Photon Absorption

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  1. LCLS Drive Laser Stabilization using Feed-Forward TechniquesAxel Brachmann, SLACNovember 20, 2003 • Electro-Optical Modulation • Nonlinear Optics Techniques • Self Focussing • Two Photon Absorption Axel Brachmann, SLAC

  2. 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 Axel Brachmann, SLAC

  3. Electro-Optical Modulation Layout Input beam Pulse stretcher Photodiode 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 Axel Brachmann, SLAC

  4. 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 Axel Brachmann, SLAC

  5. 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 Axel Brachmann, SLAC

  6. EO Feed-Forward Simulation (II) Axel Brachmann, SLAC

  7. Feed forward cost estimate Axel Brachmann, SLAC

  8. Fast forward experimental timeline Axel Brachmann, SLAC

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