Califes Laser Optical design M Gilbert – P.Y Thro - G.Cheymol Laboratoire Interaction Laser Matière/SCP/DPC/DEN/DANS/CEA Saclay DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

Laser-Matter Interaction Lab. : competences Complex optical systems and processes using the laser-matter interaction optimisation PROCESSES valorisation Laser physics Optics Laser ablation Active pyrometry Laser produced plasma Surface treatment OPTICAL SYSTEMS Laser-matter interaction Diode-pumped solid-state lasers Frequency conversion In-situ analysis in hostile environment Optical fiber technologies Innovative instrumentation MODELLING interpretation prediction Laser-matter Interaction Modelling of solid-state laser Simulation of optical systems Physicochemistry of surfaces DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

µpulse:1.5GHz,6ps, 10mJ/pulse Global Scheme Drive Beam Probe Beam drive beam output Oscillator + préamp 1047 nm 1.5GHz; 10ps 10W; 6.7 nJ/pulse Ampli n°1 et n°2 macropulse:5 Hz,270µs 20W; µpulse:1.5GHz,6ps, 10mJ/pulse Pulse shaping & stabilisation Drive Beam gun t Spare beam :  for probe beam t To simplify the following views t Pulse selector & mixer 1.5 GHz  3GHz 1 to 64 µpulse@ 3GHz 128 µpulse@ 1.5GHz Frequency Conversion ω  4ω 1047nm to 262 nm η=12% Beam transport ~ 80m & Position control Probe Beam gun DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

Pulse selector and mixer: 1.5 GHz 3 GHz 25ns Optical delay 7.5 m (25ns) Combination through a polariser t 1to64 pulses @ 3 GHz t zoom 1to32 micropulses @ 1.5 GHz max 21.3 ns t Scheme of 2 pulses to be selected and combined to generate à 3 GHz beam. ~20µs DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

Pulse picker: details and combination DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

Pulse picker: specifications Transmission expected time diagram Mains specifications for the pulse picker: sharp rise and fall time: ~400 ps (period:1.5 Ghz 666ps) duration ~ 0.5 ns to 85 ns with stability better than ± 1.25% - low transmission (< 4%) out of the pulse selected - need of high transmission on tranmitted beam but also on rejected beam (T to be confirmed) DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

Frequency conversion – Type of crystal 2w TYPE I : e Optical axis w o 2w e w TYPE II : o Optical axis DRIVE BEAM : ω  2ω BBO type I ; 2ω  4ω BBO type I PROBE BEAM : ω  2ω KTP, LBO type II  ; 2ω  4ω BBO, CLBO type I DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

Frequency conversion – parameters KTP (II) LBO (II) BBO (I) CLBO (I) ω -> 2 ω 2ω -> 4 ω  incident (nm) 1047 523 deff :non linearity coeff (pm.V) 3.0 0.62 1.74 0.8 L : length of crystal (cm) 0.6 1.5 1/e²: diameter (mm) 1.8 1.14 2.04 2.1 Tolerance: Angular acceptance: =   2  /acc   0.028 0.125 0.48 0.32 Walk-off :  =2.max..L /  0.038 0.17 0.67 0.44 GVM : GVM = GVM.L /Dt1/2 0.267 0.97 1.04 Typical parameters and tolerances calculations for entering beam parameters: 10µJ, 6ps, 1047 nm, M²(beam quality factor) =1 and for CE (conversion efficiency) =35% ( 12% for  -> 4) DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

Optical path on « laser table » / provisional DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

Optical relay /afocal system disturbance A A’ ft d Optical relay reduce consequences of miroir vibration, air turbulence in plane A’ 3 lenses afocal system allows to: - decrease the footprint of the optical system for a given relay distance. - change Gy and relay distance (to some extent) DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

« under the roof » long distance beam delivery 2 afocal optical relay: L1-L2 with f~ 10 m L3-L4 with f~ 7.5m DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

under air / under vacuum beam delivery Concequence of Temperture and Pressure variations: n-1 (~ 3 10-4) proportional to P et T. n: air optical index l = 80m and ΔT or ΔP = 1%  Δ (n .l) ~ 0.3mm  Δt ~ 1 ps. Attenuation (@ 262 nm): Rayleigh Diffusion  Transmission = 98%. Ozone absorption: = ~10-17 cm-2 (max at 255 nm). : absorption cross section 40 ppb ozone, l= 80m  T=92%.  Transport under vacuum to be prefered DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07

« photoinjector » optical table DEPARTEMENT DE PHYSICO-CHIMIE DEN/Saclay CTF3 coll meeting 16-17 jan 07