New generation Laser amplifier system for FEL applications ... · - adaptive dispersion control for...
Transcript of New generation Laser amplifier system for FEL applications ... · - adaptive dispersion control for...
F. Tavella | Hamburg | 26-01-2012 | Page 1
New generation Laser amplifier system
for FEL applications at DESY.
Franz Tavella
Helmholtz-Institut-Jena
Merging advanced solid-state Laser
technology with FEL sources
Helmholtz-Institut-Jena – DESY
F. Tavella | Hamburg | 26-01-2012 | Page 2
Overview.
Novel Laser amplifiers systems at DESY
• applications
• requirements and Laser specifications
• The system
Development status
• OPCPA and it‘s pump amplifier system
…. development
• methods – enabling technologies
• outlook
F. Tavella | Hamburg | 26-01-2012 | Page 3
Laser amplifier applications at FELs.
LINAC (electron accelerator)
(the mother of all Lasers)
Optical seed laser
and HHG
Undulator section
FLASH II experimental hall
(Pump probe lasers)
accelerator
Electron gun … photo-injector Laser
F. Tavella | Hamburg | 26-01-2012 | Page 4
The seeding driving laser amplifier.
Laser Seed X-ray ɳ Rep.-rate Pave Comments
EEHG 0.8 m
100 GW
>10 fsec
(mJ)
200 nm
up to GW
2 nm >10-1conv.,
10% losses
1 MHz
(burst)
100s W
for burst
UV and IR
both
required
CEP (evt.)
HGHG 0.8 m
10 GW
>10 fsec
(100 J)
200 nm
100 MW
20 nm >10-1conv.,
10% losses
1 MHz
(burst)
100s W
for burst
CEP
stabilization
for ultrafast
pulses
HHG+
HGHG
or
EEHG
0.8 m
100 GW
10 fsec
(mJ)
20 nm
100 kW
1 nm 10-5 conv.,
10% losses
1 MHz
(burst)
kW same
HHG 0.8 m
100 GW
10-30 fsec
(>1 mJ)
>10 nm
100 kW
> 10 nm 10-5 conv.,
10% losses
1 MHz
(burst)
kW 100 kHz
development
ongoing
HHG 0.8 m
1 TW
<10 fsec
(>10 mJ)
<10 nm
1 MW
<10 nm 10-6 conv.,
10% losses
1 MHz
(burst)
10s kW extreme
R&D
necessary
F. Tavella | Hamburg | 26-01-2012 | Page 5
Special needs…input from the future user community.
CEP stabilization?
Pulse duration (tunable?)
10 - 30 fs …seeding
Burst repetition rate 100 kHz – 1 MHz
Pulse energy
few mJ
<7 fs …pump/probe Laser
NIR Laser amplifier (~650-1000 nm)
synchronization precision to the FEL <10 fs
24/7 operation
up to hundreds of W average power
….. t
800 µs
100 ms …continuous 100 kHz operation possible
F. Tavella | Hamburg | 26-01-2012 | Page 6
Optical Parametric Chirped Pulse Amplification (OPCPA).
Non-collinear amplification (NOPA)
• type-I phasematching in BBO
• pump wave: extraordinary axis
• signal / idler wave: ordinary axis
Optical parametric chirped pulse amplification
• broadband amplification
• instantaneous process no energy storage, no inversion
• negligible absorption,… no thermal load High repetition rates (high average power)
• conversion efficiency >20% in 2-pass OPCPA
…but requires a non-conventional pump amplifier!
Dubietis et al., Opt. Commun., 88, 437 (1992).
I. N. Ross et al., Opt. Commun., 144, 125 (1997). kpump = ksignal + kidler
F. Tavella | Hamburg | 26-01-2012 | Page 7
Optical Parametric Chirped Pulse Amplifier: Setup.
Laser system Setup: combining OPCPA with ultra-short pump amplifiers
- Ti:Sa oscillator frontend
split for signal and pump seed
- adaptive dispersion control for signal (4-f SLM)
- Yb based CPA with high repetition rate
- sub-ps pump pulses from CPA
F. Tavella | Hamburg | 26-01-2012 | Page 9
The OPCPA pump amplifier.
The challenge: OPCPA pump Laser
• central wavelength: 1030 nm
(SHG @ 515 nm used for OPCPA)
• pulse energy: 20 mJ 10 mJ @ 515 nm
• repetition rate: 100 kHz cw / burst (1 MHz final version)
• pulse duration: sub-1 ps
multi-kW average power Laser amplifier!
F. Tavella | Hamburg | 26-01-2012 | Page 10
Pump amplifier: fiber amplifier front-end.
T. Eidam, et al,
Opt. Lett. 35, 94-96,
(2010).
Fiber amplifier
(IAP Jena)
Helmholtz-Institute Jena
• 4 fiber amplifiers
(2 Yb:glass rod type PCF amplifier)
• Chirped Pulse Amplifier (CPA), 2 ns → 1 ps
• current amplifier max 50 W continuous and burst
repetition rate (100 kHz – 1 MHz)
F. Tavella | Hamburg | 26-01-2012 | Page 11
Pump amplifier: fiber amplifier front-end.
T. Eidam, et al,
Opt. Lett. 35, 94-96,
(2010).
Fiber amplifier
(IAP Jena)
Helmholtz-Institute Jena
fiber amplifier
stretcher/compressor
F. Tavella | Hamburg | 26-01-2012 | Page 12
Results: OPCPA with fiber pump laser.
1-Stage OPCPA
20 µJ, 6.9 fs (F. Tavella et al, Opt. Exp. 18
4689-4694 (2010)
2-Stage OPCPA with CEP stabilization
70 µJ, 8.0 fs J. Rothhardt et al, Opt. Exp. 18
12719-12726 (2010)
2-stage OPCPA with optimized adaptive dispersion control
87 µJ, 4.8 fs
S. Hädrich et al, Opt. Letters 36, 3 (2011)
F. Tavella | Hamburg | 26-01-2012 | Page 13
Pump amplifier: fiber amplifier front-end.
T. Eidam, et al,
Opt. Lett. 35, 94-96,
(2010).
Fiber amplifier
(IAP Jena)
Helmholtz-Institute Jena
Innoslab amplifier
(ILT Aachen)
Pump amplifier: Innoslab amplifier.
F. Tavella | Hamburg | 26-01-2012 | Page 14
Pump amplifier: Innoslab amplifier.
Innoslab amplifier
(ILT Aachen)
Development from Amphos (spin-off from ILT)
Different sets of amplifier modules
• >1.5 kW currently installed at DESY (burst-mode
and continuous operation possible)
• up to multi-kW burst mode planned XFEL/DESY
F. Tavella | Hamburg | 26-01-2012 | Page 15
Pump amplifier: Innoslab amplifier.
Innoslab amplifier
(ILT Aachen)
250 W module tested between 12.5-100kHz
M. Schulz et al.,
Opt. Lett. 36 2456-2458 (2011)
830 fs FWHM
Development from Amphos (spin-off from ILT)
Different sets of amplifier modules
• >1.5 kW currently installed at DESY (burst-mode
and continuous operation possible)
• up to multi-kW burst mode planned XFEL/DESY
F. Tavella | Hamburg | 26-01-2012 | Page 16
Pump amplifier: Thin-disk amplifier.
Thin disk multipass amplifier (DESY)
Trumpf Laser GmbH
Multipass design with max. 30 passes through the disk
F. Tavella | Hamburg | 26-01-2012 | Page 17
Pump amplifier: Thin-disk amplifier.
Trumpf Laser GmbH
Multipass design with max. 30 passes through the disk
Thin disk multipass amplifier (DESY)
F. Tavella | Hamburg | 26-01-2012 | Page 18
Pump amplifier: Thin-disk amplifier.
0 2 4 6 8 10 12 14 160.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Burs
t energ
y [J]
Pump energy [J]
0 10 20 30 400,0
0,5
1,0
1,5
2,0
Burs
t energ
y [J]
Time [min]
• energy increase to max. 44.5 mJ / pulse
…but asymmetric burst
• amplification factor of 118 (1.17 per pass)
• 1.1 % rms stability
• flat burst at 25 mJ amplified pulse energy
• …compressed to 820 fs
0,0 0,2 0,4 0,6 0,80
5
10
15
20
25
30
P
uls
e e
nerg
y [m
J]
Time [ms]
Thin disk multipass amplifier (DESY)
-2 -1 0 1 20,0
0,2
0,4
0,6
0,8
1,0
AC
sig
nal [a
rb.]
Delay [ps]
F. Tavella | Hamburg | 26-01-2012 | Page 19
Pump amplifier
The challenge: OPCPA pump Laser
• central wavelength: 1030 nm
(SHG @ 515 nm used for OPCPA)
• pulse energy: 20 mJ 10 mJ @ 515 nm
• repetition rate: 100 kHz cw / burst (1 MHz final version)
• pulse duration: sub-1 ps
OPCPA development
F. Tavella | Hamburg | 26-01-2012 | Page 20
what can we do next ?
> 5 W 100s of W multi kW
Ep >1 mJ
tp = 5-30 fs
0.1-1 MHz
F. Tavella | Hamburg | 26-01-2012 | Page 21
what can we do next ?
400 μJ 20 mJ several 100 mJ (1 J possible?)
10 Hz operation
Ep >1 mJ
tp = 5-30 fs
0.1-1 MHz
Ep > 40 mJ
tp = <7 fs
10 Hz
ambitious project for the next years
F. Tavella | Hamburg | 26-01-2012 | Page 22
The „Laser-Express“.
OPCPA
• kilowatt-burst pump amplifier
• next step is OPCPA
• ready to be used this year
Highly efficient QPM HHG source
- developement & characterization
- dual gas jet target
- FLASH-II seeding planned in 2015
XUVXUV
SEEDe- XUV
XUVSEED
Franz
Tavella
Arik Willner
Arvid Hage
Michael Schulz
Robert Riedel Mark
Prandolini
F. Tavella | Hamburg | 26-01-2012 | Page 23
Seeding FLASH II.
development of a laser-driven XUV source
with high conversion efficiency
(QPM-schemes)
Collaboration partners:
- Queens University of Belfast (QUB)
group of M. Zepf
- Technical University of Crete (TEI)
group of M. Tatarakis and N. Papadogiannis
development of high repeptition rate,
mJ-level, sub-10 fs laser amplifiers
-enabling technologies-
Collaboration partners:
- Helmholtz Institut Jena
- Institut of Applied Physics Jena (IAP)
group of A.Tünnermann
- Institut für Lasertechnik Aachen (ILT)
H. Hoffmann group
- ILT-spinoff Amphos
T. Mans, C. Schnitzler
- European XFEL
M. Lederer
Laser Development... F. Tavella, A. Willner, M. Schulz, R. Riedel, A,Hage, M. Prandolini (HI-Jena/DESY/Hamburg University)
DESY-Hamburg University… S. Düsterer, J. Rossbach, M. Drescher, H. Schlarb, J. Feldhaus
FLASH-II team (DESY-Helmholtz Zentrum Berlin)... B. Faatz, A. Meseck, R. Mitzner, F. Tavella, A. Willner, M. Schulz, R.
Riedel M. Abo-Bakr, N. Baboi, J. Bahrdt, V. Balandin, W. Decking, S. Düsterer, R. Follath, A. Gamp, K. Holldack, K.
Honkavaara, T. Limberg, K. Tiedtke, R. Treusch, K. Wittenburg, S. Schreiber, M.V. Yurkov, E. Schneidmiller