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Status of the Laser System

Status of the Laser System. Sparc Laser group A. Ghigo, G. Gatti, P.Musumeci, M. Petrarca, C. Vicario. C. Vicario SPARC review committee LNF 14/06/2005. Outlines. sa. Report on the Dazzler experiment at BNL Laser system description Installation and tests of the SPARC laser

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Status of the Laser System

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  1. Status of the Laser System Sparc Laser group A. Ghigo, G. Gatti, P.Musumeci, M. Petrarca, C. Vicario. C. Vicario SPARC review committee LNF 14/06/2005

  2. Outlines • sa • Report on the Dazzler experiment at BNL • Laser system description • Installation and tests of the SPARC laser system • Conclusions C. Vicario SPARC review committee LNF 14/06/2005

  3. Impulso gaussiano senza filtraggio Dazzler

  4. 4 x 10 3 Blue UV 2.5 IR 2 1.5 Spectral intensity 1 0.5 0 780 785 790 795 800 Wavelength (nm) Dazzler Filter for Square Pulse

  5. 4 x 10 3 2.5 2 Spectral intensity 1.5 1 0.5 0 262 263 264 265 Wavelength (nm) Spettro UV ottimizzato • Conversione di armonica è molto sensibile a amp phase & amp modulation in IR. • Modulazione 1% in IR >10% in UV • FWHM UV è 1.94 nm • Spettro modulazione minima 7% • Blue edge 13%, red 17% del FWHM • Il dazzler sembra non poter compensare queste mod così fini.

  6. 100 fs IR 200 fs blue Power meter ~10 ps UV BBO crystal Misure di cross-correlazione Delayed Misure su impulsi di 20 ps mostrano una perfetta sovrapposizione tra traccia di x-correlazione e spettro

  7. cc012205 120 100 80 Detector (mV) 60 40 20 0 -5 0 5 Time (ps) 10 ps cross-correlazionemaggior peso degli ordini di fase superiori

  8. Laser • Laser parameters: Oscillator: 860mW, 790nm, 10nm BWRegen: 14.5mJ pump, 30 roundtrips, 1.45mJ output2-pass amp: 269mJ pump, 34mJ outputCompressor: 15.5mJ outputConversion: 6.2mJ input, 315uJ output, 5% efficiency. Input limitato da danneggiamento ottiche. • Dazzler resolution: 0.3nm, ma nelle condizioni sperimentali è possibile correggere dettagli ~1.5nm

  9. SDL layout 1.6 cell gun with copper cathode zero phase linac Undulators 70 MeV Linac tanks Bend Bend 70-200 MeV Triplet Triplet RF zero phase screen Dump 5 MeV 30 mJ, 10 nm Ti:Sapphire laser

  10. e-beam measurement Q=70 pC

  11. e-beam temporal distribution Q=70 pC dopo ottimizzazione filtro

  12. e-beam temporal distribution Q=300 pC

  13. Misura distribuzione temporale e spettrale

  14. UV streak camera e cross-correlation

  15. Si sono effettuate misure preliminari di emittanza @300 pC, 60 MeV • L’emittanza trasversa diminuisce da 2 a 1.5 [μrad] passando da impulso gaussiano a quello flat top. • Le misure di emittanza slice non sono consistenti. (>2.3 μrad). • Le misure evidenziavano limiti di risoluzione dei BPM. Cambiamento lattice?? • Servirebbe una analisi sistematica dei risultati.

  16. Nd:YAG pump laser Harmonics 50 Laser top view 14 ft 5 ft 5 ft 5 ft C. Vicario SPARC review committee LNF 14/06/2005

  17. Elevated support/stand (optional) SDG Synchrolock Mira control UV Stretcher Harmonics HIDRA Evolution Laser/optical table (5 x 14 ft minimum) Verdi controller EVO chiller Mira chiller EVO controller Laser side view Nd:YAG pump laser C. Vicario SPARC review committee LNF 14/06/2005

  18. General Connections Layout AC 115 V / 220 V 20 A / 10 A 50 Hz / 60 Hz Scope Remote motor control Verdicontrol box Mira control box Evolution control box Nd:YAG Pump Laser Control box SDG Hidra timing box Time box QSW sync out Trigger in Out delay 1 HV 1 BWD HV 2 Lamp OUT RF sync Electrical connections Sync out delay Out delay 2 Trigger IN USB Com. port Trigger OUT Ch. 1: RGA Cavity trace Trigger Computer USB Flash lamp trigger IN HV 1 HV 2 HSD 2 BWD out HSD 1 Com. port Sync out Q-Switch trigger IN Photodiode DC motor Hidra-50 Head Verdi Head Evolution Head Mira Head Nd:YAG Pump Laser Head Remote control Optical connections IN Air IN OUT Air OUT Tap water from facility: 2 GPM min, 40 psi. IN Water/Air connections OUT Chiller Nd:YAG pump laser chiller (part of Nd:YAG pump laser controller) C. Vicario SPARC review committee LNF 14/06/2005

  19. Picture of the oscillator and the pump C. Vicario SPARC review committee LNF 14/06/2005

  20. Oscillator pump laser Main features • CW operation, multimode • 5 W power • Frequency doubled YFL at 532.1 nm • Diode pumped solid state laser (DPSS). Diodes are in the controller. Fiber coupled to the scillator laser head. C. Vicario SPARC review committee LNF 14/06/2005

  21. Oscillator overview Main features • CW operation, at 79+1/3 Mhz • Output power 800 mW • Pulse duration >130 fs fwhm and bandwidth < 12 nm. • Tunability between 700-900 nm. • Synchronization to an external generator or laser. C. Vicario SPARC review committee LNF 14/06/2005

  22. Synchronization measurements We tested the oscillator rep. rate with an external sinusoidal oscillator. At the coherent facility the synchronization jitter of two oscillators was measured. Synchrolock Off Synchrolock On C. Vicario SPARC review committee LNF 14/06/2005

  23. Oscillator spectral and time domains measurements The spectrum and the pulse length are in the specs. C. Vicario SPARC review committee LNF 14/06/2005

  24. Dtstretch = Jsat/Idamage Ti:Al2O3 ~ 200 ps Dispersive delay line t Solid state amplifier Peak power increase proportional to Dtstretch > 1000 t t Inverse delay line Saturation is reached safely t CPA: principle of operation We first stretch the pulse in time so to lower its peak power. Then, we amplify it up to saturation, and finally we recompress the pulse width. Short pulse oscillator t t C. Vicario SPARC review committee LNF 14/06/2005

  25. Pump Verdi Pump 1 Pump 2 Continuum Evolution Ti:Sa amplifier system: components ns pulses high energy CW Seed Amplifier Mira Hidra <ps pulse, high energy 100 fs pulse, low energy C. Vicario SPARC review committee LNF 14/06/2005

  26. Chirped pulse amplifier layout Seed Compressor Stretcher Multipass amplifier Pumps Regen amplifier C. Vicario SPARC review committee LNF 14/06/2005

  27. Pictures of the amplifier Multipas amps Compressor Regen. amp. Stretcher C. Vicario SPARC review committee LNF 14/06/2005

  28. From stretcher: SEED Output 14 26 27 28 24 23 22 39 21 20 25 19 15 18 16 17 The regenerative amplifier is a z-cavity oscillator with an input and an output gates. Ejector Pockel cell and reflective polarizer Ejector off Ejector on Injector Pockel cell and waveplete C. Vicario SPARC review committee LNF 14/06/2005

  29. Amplifier’s pump lasers Regenerative pump laser • Diode-pumped, intra-cavity doubled, 1 kHz Q-switched, Nd:YLF lasers. • The laser is compact, reliable and it is fully controlled by the computer. • The output power is 15 W. Multipass pump laser • Lamp pump, amplified Nd:YAG. The amplified pulse is frequency doubled to obtain 532 nm. • The pulse energy achieves 720 mJ, with a length of 8 ns and a rep. rate of 10Hz C. Vicario SPARC review committee LNF 14/06/2005

  30. Summary of the IR specs C. Vicario SPARC review committee LNF 14/06/2005

  31. Amplified pulse measurements • The autocorrelation profile (duration of 153 fs) indicates the pulse length is about 106 fs. • IR profile at full energy: 55 mJ per pulse

  32. Harmonics UV stretcher • The UV stretcher is used to change the UV pulse length between 0.5 ps to 12 ps. • The measured efficiency is about 40%. C. Vicario SPARC review committee LNF 14/06/2005

  33. Energy stability @ 800 nm: < 5%

  34. Third harmonic generator Two thin BBO crystals are used to generate the UV light. The fundamental and the second harmonic are mixed to produce the UV pulse. C. Vicario SPARC review committee LNF 14/06/2005

  35. Second harmonic measurements C. Vicario SPARC review committee LNF 14/06/2005

  36. Third harmonic measurements Beam profile at full energy Spectrum at full energy • M2x: 2.7 • M2y: 1.9 C. Vicario SPARC review committee LNF 14/06/2005

  37. C. Vicario SPARC review committee LNF 14/06/2005

  38. Summary of the UV specs C. Vicario SPARC review committee LNF 14/06/2005

  39. Conclusion

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