overview of diode pumped high energy solid state lasers
TRANSCRIPT
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Seite 1 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Overview of diode pumped high energy solid state lasers
F. Röser, M. Löser, D. Albach, M. Siebold, U. Schramm, R. Sauerbrey Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
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Seite 2 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Overview
High-Energy class diode-pumped solid state lasers
Projects worldwide
PENELOPE Project
Motivation – Laser driven ion therapy
Project description & status
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Seite 3 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
High-power laser diodes:
+ up to 60% electrical-to-optical
efficiency
+ reduced heat into the laser medium
+ 1000× higher brightness than lamps
+ liftime: 1Gshot
(i.e. 10a@10Hz, 200d/a, 10h/d)
Diode-pumping
- Price ($/W)
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Seite 5 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
HEC-DPSSLs: MERCURY
Yb:S-FAP, 60J, 10Hz, 12% + high efficiency at room temperature + longitudinal pumping & cooling + distributed bulk laser + high gain material – sophisticated gas cooling – exotic gain medium – large quantum defect
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Seite 7 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
DiPOLE high-energy amplifier
HEC-DPSSLs: DIPOLE
cryo Yb:YAG, 7J, 10Hz, 20%
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Seite 8 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
HEC-DPSSLs: HALNA
Nd:glass, 22J, 10Hz, 12% + high efficiency at room temperature + large volume gain medium available + no reabsorption at room temperature + high gain material – short fluorescence lifetime of Nd – large quantum defect – transverse pumping – 1D aperture/energy scaling
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Seite 10 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
HEC-DPSSLs: GENBU
Yb:YAG, 200mJ, 100Hz, 30% + high efficiency + longitudinal cooling + multiple active mirrors – cryo cooling – energy/aperture scaling limits
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Seite 12 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
HEC-DPSSLs: LUCIA
Yb:YAG, 14J, 2Hz, 12% + room temperature operation + active mirror concept + gradient doping option + energy scaling option at multiple active mirrors – water cooling (jet plate)
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Seite 14 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
HEC-DPSSLs: HILASE-Prague/LWS Munich
Yb:YAG thin-disk + room temperature operation + commercial thin-disk technology – low gain – energy scaling limited due to ASE – up to 1J feasible
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Seite 16 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
HEC-DPSSLs: POLARIS-Jena
Yb:glass, 16J, 0.01Hz, 5% + room temperature operation + broad bandwidth (~15nm) operation – low efficiency due to reabsorption – low rep-rate – 940nm pumping (instead of 980nm) – bulk laser design – brightness losing pump engine – transverse cooling
Yb:CaF2, 400mJ, 1Hz, 3% + relay imaging cavity + possibly high efficiency + 940nm pumping (no diode stabilazation) – cryo / vacuum technology – narrowed bandwidth – bulk laser design – transverse cooling
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Seite 17 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Overview
High-Energy class diode-pumped solid state lasers
Projects worldwide
PENELOPE Project
Motivation – Laser driven ion therapy
Project description & status
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Seite 18 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
future: compact proton accelerators for radiation therapy
Motivation – Laser driven ion therapy
0 10 20 300
1
Protonen
No
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rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
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rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
0 10 20 300
1
(175-190 MeV)Protonen
Protonen
No
rmie
rte D
osis
Eindringtiefe in Wasser / cm
Photonen
healthy tissue tumor
Penetration depth in water [cm]
No
rma
lize
d d
os
e
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Seite 19 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Motivation – Laser driven ion therapy
© GSI Darmstadt
Localized dose deposition for
precise tumour treatment
Benefitial for 10-20% of patients
Conventional ion therapy
Large scale/costly setup:
accelerator, beam guidance &
radiation shielding
Laser driven ion therapy
Pro
ton
nu
mb
er
Time
1 s
~1 ns
high acceleration
gradients TV/m
compact source and
laser beam transport
1010 to 1013 ions per pulse
Short ion pulses: fs to ps at the
source
Broad energy spectrum
Facility Image courtesy by Stern, Gruner+Jahr AG & Co KG, Germany Dose Image courtesy by O. Jäkel, DKFZ Heidelberg, Germany
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Seite 20 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Basic research High pulse dose rate radiation
Biological effectiveness?
Clinical practice Laser driven dose delivery system
Stable & reliable laser proton accelerator
Precise beam delivery: Spatial & spectral shaping
Real-time dosimetry
Translational Research - Concept
Laser / plasma development
100
depth in water [cm]
• Proton energy Increase
• not monoenergetic, but sufficiently high
rela
tive e
ffective d
ose [%
]
Clinical trials
In vitro - cells
In vivo - animals
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Seite 21 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Center for high power radiation sources
Start in summer 2010
Building finished in summer 2011
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Seite 22 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Center for high power radiation sources
2012 - New lab space (800 m2): clean rooms – workshop – cell lab
Footprint of the extended ELBE (electron accelerator) building
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Seite 23 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Center for high power radiation sources
DRACO Laser (Ti:Sa, 4J in 30fs -> ~150TW) and ion acceleration area
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Seite 24 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Center for high power radiation sources
2013: DRACO Upgrade
Dual ultra-short pulse beam option (50TW / 500TW)) (~1.5/15J in 30fs)
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Seite 25 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Center for high power radiation sources
~2014/15 - PEnELOPE 150J in <150fs, >1Hz rep rate active medium (Yb:CaF2) fully diode pumped system
Petawatt, Energy-Efficient Laser for Optical Plasma Experiments
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Seite 26 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
OGZ – joint center for radiation research
experimental cave
43 m
las
er-d
riven
Conventional proton therapy facility (patient treatment start 2014)
+ unique benchmarking option for in-house laser accelerator
direct comparison to conventional proton beam
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Seite 27 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Overview
High-Energy class diode-pumped solid state lasers
Projects worldwide
PENELOPE Project
Motivation – Laser driven ion therapy
Project description & status
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Seite 28 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Front end: 1) single CPA 2a) double CPA + XPW 2b) OPCPA +pump laser up to 10J (Yb:YAG)
Goal: 150J, <150fs, 1Hz, >5% o-o eff.
Layout
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Seite 29 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Laboratory infrastructure
Tables: 90m²
Lab space: 340m2
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Seite 31 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Amplifier Design – Multi Slab approach
→ tested at 60J, 10Hz (LLNL) & 10J, 6Hz (RAL) → low thermal abberations → operation at RT + MP pumping possible → solid angle for pump & extraction: 4p instead of 2p → 4 slabs 110 mm diameter, thickness: 5mm
[K. Ertel et.al. Opt. Express 27, 26610 (2011)]
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Seite 32 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Amplifier Design – Final amplifier stage
2 × 600kW
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Seite 33 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Amplifier Design – Brightness Requirement
(7.5“ @ 200J)
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Seite 34 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Compressor
dielectric gratings (PGL) 940 × 420 mm²
1760 lines/mm, ~0.5 J/cm2
Beam diameter: 250mm
Dimensions: 6 × 3 × 1.5 m3
(~15k€/m3 vacuum)
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Seite 35 F. Röser ■ [email protected] ■ www.hzdr.de ■ HZDR
Conclusions
Today:
Worldwide high energy projects push laser and optics technology, but limited
in repetition rate/average power due to heat dissipation timescales
Dresden program for laser driven proton therapy with prototype diode
pumped PW laser system PEnELOPE.
Future:
ICAN concept - significant repetition rate scaling
ICAN laser profits from experience of large single beam lasers in terms of
laser technology, e.g. contrast control, pulse shaping&control, high power
optics development