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Laser Chain status:Amp1 &Harmonic generation
detailsMassimo Petrarca & Marta Divall
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First Amplifier layout
M1
M2
M3
M4
M5
1st pass2nd pass3rd pass
F1 = +1146mmPreamp. beam
58cm54cm
21cm3.5cm 2.5cm
5cm
M6 Nd:Ylf rod
-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 85ampSatisfactory trace pulse stability has been reachedTransverse beam parameters:M2
x~2.38; M2x~1.94
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M1
M2
M3
M4
M5
1st pass
2nd pass
3rd pass
F1 = +1146mm
Preamp. beam
58cm54cm
21cm
3.5cm2.5cm
5cm
Camera
X=1.439 mm
Y=1.323 mm
X=1.579 mm
Y=1.432 mm@ 50a
@ 60av
@ 80a@ 70a
X=1.698 mm
Y=1.544 mm
X=1.800 mm
Y=1.685 mm
Imaging the rod center
Imaging lens
Looking at the amplification processBy imaging the transverse beam profile in the rod
Along the 3rd passageF = +20cm
Magnification=78/27~2.8 @0amp
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Temporal Profile & Power
M1
M2
M3
M4
M5
1st pass2nd pass3rd pass
F1 = +1146mmPreamp. beam
58cm54cm
21cm3.5cm 2.5cm
5cm
M6 Nd:Ylf rod
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
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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
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Amp1 Harmonic GenerationIR energy within 2s
gate
GREEN energy
within 2s gate
UV
Energy within
2s gate
Amp1 @80amps
PC on 2s
( Best Result )
(3.97-1.3)mJ
std=0.02mJ
1.170 mJ
Std=0.16mJ
0.398 mJ
Std=0.012
133.3 nJ in a micro pulse
~44 % efficiency
~34 % efficiency
Amp1 @80amps
PC on 2s
(4.15-1.33)mJ
std=0.06mJ
1.15 mJ
Std=0.05mJ
0.375 mJ
Std=0.02
123.3 nJ in a micro pulse
Satisfactory conversion efficiency values has been achieved either for SHG and FHGobtaining a final micro pulse energy of ~120 nJ with only AMP1 working at 80amps
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Next
- Synchronization
- Second amplifier optimization
- Harmonic conversion with second amplifier on
-……