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Laser Chain status: Amp1 &Harmonic generation details Massimo Petrarca & Marta Divall

Laser Chain status: Amp1 &Harmonic generation details Massimo Petrarca & Marta Divall. F1 = +1146mm. Preamp. beam. M4. 21cm. M2. Nd:Ylf rod. M6. 2.5cm. 3.5cm. M3. M1. M5. 5cm. 54cm. 58cm. 1 st pass. 2 nd pass. 3 rd pass. First Amplifier layout.

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Laser Chain status: Amp1 &Harmonic generation details Massimo Petrarca & Marta Divall

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  1. Laser Chain status:Amp1 &Harmonic generation detailsMassimo Petrarca & Marta Divall

  2. F1 = +1146mm Preamp. beam M4 21cm M2 Nd:Ylf rod M6 2.5cm 3.5cm M3 M1 M5 5cm 54cm 58cm 1st pass 2nd pass 3rd pass First Amplifier layout -After the discovery of Amp1 problems (thanks to harmonic generation + scope) the Amp1 design has been revised and changed: 3 different configuration. -Final configuration: 3 passages trough the rod with F1 to ~ compensate for the beam divergence: X(3rd pass)-X(1st pass)~1.2mm; Y(3rd pass)-Y(1st pass)~1mm . Nominal power ~3KW has been reached with 85amp Satisfactory trace pulse stability has been reached Transverse beam parameters:M2x~2.38; M2x~1.94

  3. X=1.439 mm Y=1.323 mm X=1.579 mm Y=1.432 mm @ 50a @ 60av @0amp @ 70a @ 80a F1 = +1146mm Preamp. beam M4 21cm M2 2.5cm 3.5cm M5 M3 M1 X=1.698 mm Y=1.544 mm X=1.800 mm Y=1.685 mm 5cm 54cm 58cm 1st pass 2nd pass 3rd pass Imaging the rod center Looking at the amplification process By imaging the transverse beam profile in the rod Along the 3rd passage F = +20cm Magnification=78/27~2.8 Camera Imaging lens

  4. F1 = +1146mm Preamp. beam M4 21cm M2 Nd:Ylf rod M6 2.5cm 3.5cm M3 M1 M5 5cm 54cm 58cm 1st pass 2nd pass 3rd pass Temporal Profile & Power Power Masurements: Unamplified  ~ 5.4 W @ 50 amps  ~ 6.6 W @ 60 amps  ~ 7.5 W @ 70 amps  ~ 8.4 W @ 80 amps  ~ 9.4 W  ~2.75 KW @ 85 amps  ~ 9.9 W  ~3.1 KW

  5. Temporal Profile after Pockel Cell Macro pulse window selection by Pockels Cell Leading edge from Pockels Cell Trailing edge from Pockels Cell Selected window edge from Pockels Cell

  6. Amp1 Harmonic Generation Satisfactory conversion efficiency values has been achieved either for SHG and FHG obtaining a final micro pulse energy of ~120 nJ with only AMP1 working at 80amps

  7. Next • Synchronization • Second amplifier optimization • Harmonic conversion with second amplifier on • ……

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