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Drive Laser Introduction

Drive Laser Introduction. ‘ir’ master oscillator power amplifier chain (MOPA) uses standard chirped pulse amplification scheme (CPA) third harmonic generation (THG) produces required uv for photocathode irradiation ‘ir’ master oscillator is a mode-locked source which is locked to external RF

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Drive Laser Introduction

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  1. Drive Laser Introduction • ‘ir’ master oscillator power amplifier chain (MOPA) uses standard chirped pulse amplification scheme (CPA) • third harmonic generation (THG) produces required uv for photocathode irradiation • ‘ir’ master oscillator is a mode-locked source which is locked to external RF • Finesse and Reliability are key – stabilities and shaping • readily accommodate technical upgrades

  2. LCLS Drive LaserSections • Oscillator • Temporal Pulse Shaping • Preamplifier • Final Amplifier • UV Conversion and Pulse Shaping • UV Transport (to photocathode) • Other Beamlines (EO diagnostic, laser heater,…)

  3. Drive Laser Architecture: TiS mode-locked oscillator @ 119 MHz (ext reference) & with few nm bandwidth Temporal Pulse Shaper Temporal Stretcher KHz pulse selection Spatial filtering & pulse compression 120 Hz Pulse selection Power amplifier with pumps Preamplifier with pump Relay Imaging UV Profile Shaping and Transport to Photocathode UV Conversion and wavelength separation Injector Photocathode

  4. KHz pulse selection shaper + stretcher (estimate combined efficiency 10-15 %) 4x30Hz Splitter preamplifier + pump (few mJ) isolator isolator oscillator + pump (few nJ) cross-correlator diagnostic compressor Probe 1 & oscillator diagnostics Probe 2 & diagnostics Probe 3 & preamplifier diagnostics to TiS final amplifier (eg. four arms)

  5. 30 Hz pump (500 gr mJ) 30 Hz pump (500 gr mJ) 30 Hz pump (500 gr mJ) 30 Hz pump (500 gr mJ) TiS TiS TiS TiS Final Amplifier - Plan A: From 4x30 Hz splitter 80-100 mJ (3 W @ 30 Hz) Energy stabilization 80-100 mJ (6 W @ 60 Hz) combiner uv generation Energy stabilization High power compressor 80-100 mJ (12 W @ 120 Hz) combiner Energy stabilization combiner uv profile flattener Energy stabilization Multipass amplifier heads (eg. four pass) uv to photocathode blue to EO ir to laser heater

  6. Beamlines crystal pair wavelength separation unconverted ir to laser heater uv profile flattener unconverted blue to EO diagnostic uv to photocathode ( mJ)

  7. Some Drive Laser Challenges • final amplifier designs : plans A and B (minimize ‘ir’ pulse energy requirements) • STABILITIES such as ‘uv’ pulse energy stability (done at ‘ir’ level) • optimize uv conversion efficiency (‘ir’ temporal shaping effects, pulse quality for unconverted light) • ‘ir’ control of uv temporal pulse shape • uv profile shaping and efficient uv transport (final launch phase…) • essential prototyping (FY’04 especially) • readily accommodate repairs and technical upgrades during LCLS operation

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