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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 6 — Mar. 14, 2011
  • pp: 5357–5363
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High energy picosecond Yb:YAG CPA system at 10 Hz repetition rate for pumping optical parametric amplifiers

Sandro Klingebiel, Christoph Wandt, Christoph Skrobol, Izhar Ahmad, Sergei A. Trushin, Zsuzsanna Major, Ferenc Krausz, and Stefan Karsch  »View Author Affiliations


Optics Express, Vol. 19, Issue 6, pp. 5357-5363 (2011)
http://dx.doi.org/10.1364/OE.19.005357


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Abstract

We present a chirped pulse amplification (CPA) system based on diode-pumped Yb:YAG. The stretched ns-pulses are amplified and have been compressed to less than 900fs with an energy of 200mJ and a repetition rate of 10Hz. This system is optically synchronized with a broadband seed laser and therefore ideally suited for pumping optical parametric chirped pulse amplification (OPCPA) stages on a ps-timescale.

© 2011 Optical Society of America

1. Introduction

High-power, few-cycle light pulses are of great interest for studying laser-matter interactions at extreme conditions. Several applications such as the generation of mono-energetic electron beams by laser-wakefield acceleration in the “bubble” regime or higher-harmonic generation from solid surfaces have been demonstrated [1

1. J. Faure, Y. Glinec, A. Pukhov, S. Kiselev, S. Gordienko, E. Lefebvre, J.-P. Rousseau, F. Burgy, and V. Malka, “A laser-plasma accelerator producing monoenergetic electron beams,” Nature 431, 541–544 (2004). [CrossRef] [PubMed]

, 2

2. Y. Nomura, R. Horlein, P. Tzallas, B. Dromey, S. Rykovanov, Zs. Major, J. Osterhoff, S. Karsch, L. Veisz, M. Zepf, D. Charalambidis, F. Krausz, and G. D. Tsakiris, “Attosecond phase locking of harmonics emitted from laser-produced plasmas,” Nat Phys 5, 124–128 (2009). [CrossRef]

] and theoretical predictions call for light sources delivering ever shorter and more powerful pulses in order to drive these processes more efficiently [3

3. M. Geissler, J. Schreiber, and J. M. ter Vehn, “Bubble acceleration of electrons with few-cycle laser pulses,” New J. Phys. 8, 186 (2006). [CrossRef]

, 4

4. G. D. Tsakiris, K. Eidmann, J. M. ter Vehn, and F. Krausz, “Route to intense single attosecond pulses,” New J. Phys. 8, 19 (2006). [CrossRef]

]. The generation of Joule-class pulse energies combined with the few-cycle duration has yet to be demonstrated.

Recently Yb:YAG based CPA systems delivering sub-2ps pulses with energies as high as 125mJ at 100Hz [11

11. J. Tümmler, R. Jung, H. Stiel, P. V. Nickles, and W. Sandner, “High-repetition-rate chirped-pulse-amplification thin-disk laser system with joule-level pulse energy,” Opt. Lett. 34, 1378–1380 (2009). [CrossRef] [PubMed]

], and 25mJ at 3kHz [12

12. T. Metzger, A. Schwarz, C. Y. Teisset, D. Sutter, A. Killi, R. Kienberger, and F. Krausz, “High-repetition-rate picosecond pump laser based on a yb:yag disk amplifier for optical parametric amplification,” Opt. Lett. 34, 2123–2125 (2009). [CrossRef] [PubMed]

] have been demonstrated. For the PFS pump laser we aim for higher pulse energies but limit our repetition rate to 10Hz. We have developed Yb:YAG amplifiers and have shown up to 3J pulse energy with ns-pulses at 1Hz repetition rate [13

13. M. Siebold, J. Hein, C. Wandt, S. Klingebiel, F. Krausz, and S. Karsch, “High-energy, diode-pumped, nanosecond Yb:YAG MOPA system,” Opt. Express 16, 3674–3679 (2008). [CrossRef] [PubMed]

], and for 200mJ pulses we raised the repetition rate to 10Hz [14

14. Chr. Wandt, S. Klingebiel, M. Siebold, Zs. Major, J. Hein, F. Krausz, and S. Karsch, “Generation of 220mJ nanosecond pulses at a 10Hz repetition rate with excellent beam quality in a diode-pumped Yb:YAG MOPA system,” Opt. Lett. 33, 1111–1113 (2008). [CrossRef] [PubMed]

]. In this paper we present a full characterization of a high energy CPA system generating the shortest high energy pulses in Yb:YAG and show its potential for OPCPA pumping. We implemented a spatial light modulator (SLM) for spectral amplitude shaping which counteracts gain narrowing and therefore pushes the limit for the compressed pulse length below 900fs. Simulations show, that similar values can be reached for 50 J pulse energy.

2. Experimental setup

As shown in Fig. 1(a) Ti:sapphire fs oscillator (Femtolaser rainbow) is used as front-end. The advantage of this approach is that the broadband OPCPA seed can be derived from the same oscillator and therefore will be optically synchronized. For the OPCPA pump a fraction of the oscillator output is spectrally shifted to 1030nm in a photonic-crystal fiber. An interference filter selects a Δλ = 10 nm band centered at 1030 nm from the frequency spectrum with 3.4 pJ pulse energy. This output is then amplified in a two-stage Yb-doped fiber amplifier (designed by the Institute for Applied Physics, Jena, Germany) to 14 nJ pulse energy (70 MHz, 4.4 ps).

Fig. 1 Experimental setup: The seed pulses from the Ti:Sa oscillator are spectrally shifted to 1030 nm in a photonic crystal fiber (PCF), pre amplified in a double stage fiber amplifier, stretched to 3ns and their spectral amplitude is shaped by an SLM in a zero-dispersion stretcher. The subsequent Dazzler shapes the spectral phase to improve the compression. The amplifier chain consists of a Yb:glass regenerative amplifier and a Yb:YAG multipass. After the main amplification compression is realized in a Treacy type compressor. TFP:thin film polarizer,QWP: quarter wave plate, SLM: Spatial Light Modulator.

The seed pulses are temporally stretched in a compact all-reflective grating stretcher [15

15. P. Banks, M. Perry, V. Yanovsky, S. Fochs, B. Stuart, and J. Zweiback, “Novel all-reflective stretcher for chirped-pulse amplification of ultrashort pulses,” IEEE J. Quant. Electron. 36, 268–274 (2000). [CrossRef]

] to a FWHM pulse-duration of 3ns with a spectral bandwidth of 4nm centered at 1030nm. It has been constructed using a 1740 lines/mm multilayer-dielectric reflection grating with an angle of incidence of 59°, a f= 2.5m concave mirror, a flat mirror in the focal plane of the curved one, and two retroreflectors. This geometry provides a 4-times folded optical path, i.e. 8 reflections off the grating.

In Yb:YAG the bandwidth is normally limited by strong gain narrowing therefore we incorporated a spatial light modulator (SLM) which allows spectral amplitude shaping by changing the transmission for each wavelength. The SLM (CRI corporation) is located in the Fourier plane of an additional zero-dispersion stretcher, which is adapted to the aperture of the used SLM (12.8mm × 5mm). The losses of this setup are easily compensated by a few more round trips in the subsequent regenerative amplifier. Recently, a Dazzler (Fastlite Inc.) was implemented with the capability of simultaneously shaping the spectral phase and amplitude. Nevertheless the presented results were achieved using the SLM for spectral amplitude shaping.

Fig. 2 Measured beam profiles: a) output beam profile of the regenerative amplifier (2.5mm diameter), b) output beam profile of the 8-pass amplifier (2.5mm diameter) and c) beam profile of the frequency doubled beam down collimated to 1.3 mm diameter at the position of the first OPA stage. The diffraction rings originate from dust on the filters in front of the camera.

For reaching the final output energy, we apply an 8-pass, diode-pumped, Yb:YAG amplifier, which is an upgraded version of the amplifier presented in [14

14. Chr. Wandt, S. Klingebiel, M. Siebold, Zs. Major, J. Hein, F. Krausz, and S. Karsch, “Generation of 220mJ nanosecond pulses at a 10Hz repetition rate with excellent beam quality in a diode-pumped Yb:YAG MOPA system,” Opt. Lett. 33, 1111–1113 (2008). [CrossRef] [PubMed]

]. The AR-coated Yb:YAG crystal rod (8mm long, 6mm diameter, 3 at.% -doped) is connected to a copper heat sink with indium foil over its lateral area and is pumped by a diode-laser stack (Jenoptik Laserdiode GmbH) with an output power of 3 kW (1.5 ms, 10 Hz) at a center wavelength of 940 nm. In order to provide a small signal single pass gain of approximately 3 a pump intensity of 35kW/cm2 is needed and the pump is focused to an area of 0.086cm2. For a fixed pump power, the length of the individual passes in this non-imaging amplifier setup can be chosen in such a way that the beam size on the crystal stays 2.5mm for all passes. This amplifier boosts the energy from 180μJ to 300mJ (3% standard deviation) with the beam profile shown in Fig. 2(b). In order to quantify the beam quality, we measured the strehl ratio of the compressed 1030nm beam. The beam profile is measured in the near- and far field. Additionally the far field distribution for a perfect gaussian beam with the same size in the near field is simulated. Thereafter, the encircled energy on the area of πω02 was calculated for the calculated focus and compared to the encircled energy on the same area for the measured focus. With this method the strehl ratio was measured to be 0.82±0.05.

3. Results and discussion

The high gain of 1500 in the main amplifier would lead to a gain-narrowed bandwidth of 1.5nm (cf. Figure 4 a) and thus to a shortened pulse duration for stretched pulses which would increase the risk of optical damage significantly. In order to counteract this effect and to preserve the maximum bandwidth we applied spectral amplitude shaping. The final output spectrum and the corresponding shaped input spectrum are shown in Fig. 3(b).

Fig. 4 Results of the simulation: a) gain narrowing for a top-hat input spectrum (red), and the reduced effect for the spectrally shaped spectrum (black). Figure b) shows the normalized spectra at different amplification levels for shaped pulses and illustrates, how the input spectrum with a dip in the center evolves to a tophat spectrum during amplification while the bandwidth is preserved large.
Fig. 3 (a) The input spectrum (red, dashed) which supports a broad flattop spectrum (black, solid) after amplification is calculated. In b) measured spectra for the maximum amplification are shown. The amplified spectrum (black, solid) is still suppressed in the center, showing that further amplification is possible without significant gain narrowing.

We also investigated the effect of gain narrowing numerically. The calculations used a simple model based on the rate equations as described in [14

14. Chr. Wandt, S. Klingebiel, M. Siebold, Zs. Major, J. Hein, F. Krausz, and S. Karsch, “Generation of 220mJ nanosecond pulses at a 10Hz repetition rate with excellent beam quality in a diode-pumped Yb:YAG MOPA system,” Opt. Lett. 33, 1111–1113 (2008). [CrossRef] [PubMed]

]. There it was shown, that the simulation of the amplification in Yb:YAG fits well to the experimental data. For spectral shaping we carry out the reverse calculation, in order to find a suitable input spectrum for the desired output spectrum.

As an example, we calculated the input spectrum for 3.5nm FWHM top-hat output profile, as shown in Fig. 3(a). The major feature is the dip at 1030nm. Compared to the spectrum predicted by our model, the real input spectrum (Fig. 3(b) has narrower wings due to clipping in the stretcher, and we choose it in such a way, that the output spectrum is still suppressed in the center to enable further amplification without significant gain narrowing.

Furthermore the bandwidth for our final gain factor of 2.5 · 105 was simulated by subsequently raising the pump power. The results are shown in Fig. 4(a), which illustrates the change of the FWHM bandwidth of the shaped input spectrum with overall gain. Compared to a top-hat shaped input spectrum our calculation predicts a threefold increase in bandwidth. Fig. 4(b) shows the calculated spectral shape and illustrates how this shape evolves into a smooth top-hat spectrum with increasing gain.

We succeeded in compressing these spectrally shaped, amplified pulses with 66% efficiency to 900fs with 200mJ. In a Treacy type grating compressor [16

16. E. Treacy, “Optical pulse compression with diffraction gratings,” IEEE J. Quant. Electron. - 5, 454–458 (1969). [CrossRef]

] with 6m grating separation, gratings with the same grating period as in the stretcher are utilized. As shown in Fig. 1 we use a reverse configuration, meaning that the incident beam has a smaller angle to the grating normal than the diffracted one. The grating angles were optimized for shortest pulses and the implemented Dazzler enables us to correct for higher order phases.

The compressed pulse duration is measured by a home-built single-shot second-order autocorrelator with a tuning window of 6ps and a pixel resolution of 22fs. This device is designed to measure 700fs pulses with 6% accuracy. For 1000 shots the autocorrelation traces are measured the mean width is 1.21ps with a standard deviation of 0.04ps. The measured autocorrelation trace is shown in Fig. 5.

Fig. 5 Calculated autocorrelation trace for the Fourier-limited pulse (black) and measured autocorrelation trace (red). The latter one is normalized to to enclose the same area as the calculated autocorrelation trace. The corresponding pulse length is 884 fs and 895 ps, respectively.

The fourier limited pulse shape and the corresponding autocorrelation trace are calculated from the measured spectrum. From this we have inferred a deconvolution factor between the pulse duration and the width of the autocorrelation trace of 1.3518 for this particular case. Using this factor we can obtain a realistic estimate for our compressed pulse duration which turns out to be 895fs (transform limit 884fs) with a measurement uncertainty of 40fs. As can be seen in Fig. 5 the autocorrelation trace is slightly asymmetric, which is most likely caused by an imperfect beam profile in the autocorrelator. Although the main pulse is close to fourier limited FWHM, there are large side wings which could be explained by uncompensated higher order dispersion. Another possibility could be spatio-temporal coupling caused by B-integral issues when the compressed pulse propagates in several meters air after the last grating. This problem will be solved by a vacuum chamber for the compressor, which is currently under construction.

In a 5mm type 2 DKDP crystal frequency doubling with 40% conversion efficiency is achieved so far. We therefore have 80mJ pulse energy in the green, which is sufficient for pumping the first two to three OPA stages. The beam profile of the frequency doubled beam at the position of the first OPA stage is shown in Fig. 2(c).

Another important aspect for short pulse pumped OPCPA is the timing jitter between pump and seed pulses. In our case the pulse length is 1ps and therefore a timing jitter at least 100fs is desired for reliable operation of the OPCPA process. We measured the timing jitter in a single-shot cross-correlation experiment between the 30fs, 800nm pulse (representing the timing of the OPCPA seed) and the compressed pulses (1030nm) in a 1mm BBO crystal. The relative position of the correlation traces on the camera can be converted to a relative timing between the pulses. On a 10s timescale, a jitter of 273fs standard deviation was measured. We believe, these timing fluctuations mainly originate from air turbulences, and the mechanical instability of different optical components in the pump laser chain. A more extensive analysis of the jitter is under way in order to find out where exactly this jitter originates from. Preliminary results show, that active stabilization allows for a timing jitter of less than 100fs.

4. Summary

Acknowledgments

The authors appreciate the support of the Max-Planck Society.

References and links

1.

J. Faure, Y. Glinec, A. Pukhov, S. Kiselev, S. Gordienko, E. Lefebvre, J.-P. Rousseau, F. Burgy, and V. Malka, “A laser-plasma accelerator producing monoenergetic electron beams,” Nature 431, 541–544 (2004). [CrossRef] [PubMed]

2.

Y. Nomura, R. Horlein, P. Tzallas, B. Dromey, S. Rykovanov, Zs. Major, J. Osterhoff, S. Karsch, L. Veisz, M. Zepf, D. Charalambidis, F. Krausz, and G. D. Tsakiris, “Attosecond phase locking of harmonics emitted from laser-produced plasmas,” Nat Phys 5, 124–128 (2009). [CrossRef]

3.

M. Geissler, J. Schreiber, and J. M. ter Vehn, “Bubble acceleration of electrons with few-cycle laser pulses,” New J. Phys. 8, 186 (2006). [CrossRef]

4.

G. D. Tsakiris, K. Eidmann, J. M. ter Vehn, and F. Krausz, “Route to intense single attosecond pulses,” New J. Phys. 8, 19 (2006). [CrossRef]

5.

P. Dietrich, F. Krausz, and P. B. Corkum, “Determining the absolute carrier phase of a few-cycle laser pulse,” Opt. Lett. 25, 16–18 (2000). [CrossRef]

6.

Zs. Major, S. Trushin, I. Ahmad, M. Siebold, Chr. Wandt, S. Klingebiel, T. Wang, J. A. Fülöp, A. Henig, S. Kruber, R. Weingartner, A. Popp, J. Osterhoff, R. Hörlein, J. Hein, V. Pervak, A. Apolonski, F. Krausz, and S. Karsch, “Basic concepts and current status of the petawatt field synthesizer-a new approach to ultrahigh field generation,” Review of Laser Engineering 37, 431–436 (2009).

7.

I. Ahmad, S. Trushin, Zs. Major, C. Wandt, S. Klingebiel, T.-J. Wang, V. Pervak, A. Popp, M. Siebold, F. Krausz, and S. Karsch, “Frontend light source for short-pulse pumped opcpa system,” Appl. Phys. B: Lasers and Optics 97, 529–536 (2009). [CrossRef]

8.

O. V. Chekhlov, J. L. Collier, I. N. Ross, P. K. Bates, M. Notley, C. Hernandez-Gomez, W. Shaikh, C. N. Danson, D. Neely, P. Matousek, S. Hancock, and L. Cardoso, “35 j broadband femtosecond optical parametric chirped pulse amplification system,” Opt. Lett. 31, 3665–3667 (2006). [CrossRef] [PubMed]

9.

V. V. Lozhkarev, G. I. Freidman, V. N. Ginzburg, E. V. Katin, E. A. Khazanov, A. V. Kirsanov, G. A. Luchinin, A. N. Mal’shakov, M. A. Martyanov, O. V. Palashov, A. K. Poteomkin, A. M. Sergeev, A. A. Shaykin, and I. V. Yakovlev, “Compact 0.56 Petawatt laser system based on optical parametric chirped pulse amplification in KD*P crystals,” Laser Phys. Lett. 4, 421–427 (2007). [CrossRef]

10.

D. Herrmann, L. Veisz, R. Tautz, F. Tavella, K. Schmid, V. Pervak, and F. Krausz, “Generation of sub-three-cycle, 16 tw light pulses by using noncollinear optical parametric chirped-pulse amplification,” Opt. Lett. 34, 2459–2461 (2009). [CrossRef] [PubMed]

11.

J. Tümmler, R. Jung, H. Stiel, P. V. Nickles, and W. Sandner, “High-repetition-rate chirped-pulse-amplification thin-disk laser system with joule-level pulse energy,” Opt. Lett. 34, 1378–1380 (2009). [CrossRef] [PubMed]

12.

T. Metzger, A. Schwarz, C. Y. Teisset, D. Sutter, A. Killi, R. Kienberger, and F. Krausz, “High-repetition-rate picosecond pump laser based on a yb:yag disk amplifier for optical parametric amplification,” Opt. Lett. 34, 2123–2125 (2009). [CrossRef] [PubMed]

13.

M. Siebold, J. Hein, C. Wandt, S. Klingebiel, F. Krausz, and S. Karsch, “High-energy, diode-pumped, nanosecond Yb:YAG MOPA system,” Opt. Express 16, 3674–3679 (2008). [CrossRef] [PubMed]

14.

Chr. Wandt, S. Klingebiel, M. Siebold, Zs. Major, J. Hein, F. Krausz, and S. Karsch, “Generation of 220mJ nanosecond pulses at a 10Hz repetition rate with excellent beam quality in a diode-pumped Yb:YAG MOPA system,” Opt. Lett. 33, 1111–1113 (2008). [CrossRef] [PubMed]

15.

P. Banks, M. Perry, V. Yanovsky, S. Fochs, B. Stuart, and J. Zweiback, “Novel all-reflective stretcher for chirped-pulse amplification of ultrashort pulses,” IEEE J. Quant. Electron. 36, 268–274 (2000). [CrossRef]

16.

E. Treacy, “Optical pulse compression with diffraction gratings,” IEEE J. Quant. Electron. - 5, 454–458 (1969). [CrossRef]

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(320.5520) Ultrafast optics : Pulse compression
(140.3615) Lasers and laser optics : Lasers, ytterbium

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 30, 2010
Revised Manuscript: January 14, 2011
Manuscript Accepted: January 17, 2011
Published: March 7, 2011

Citation
Sandro Klingebiel, Christoph Wandt, Christoph Skrobol, Izhar Ahmad, Sergei A. Trushin, Zsuzsanna Major, Ferenc Krausz, and Stefan Karsch, "High energy picosecond Yb:YAG CPA system at 10 Hz repetition rate for pumping optical parametric amplifiers," Opt. Express 19, 5357-5363 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-6-5357


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References

  1. J. Faure, Y. Glinec, A. Pukhov, S. Kiselev, S. Gordienko, E. Lefebvre, J.-P. Rousseau, F. Burgy, and V. Malka, “A laser-plasma accelerator producing monoenergetic electron beams,” Nature 431, 541–544 (2004). [CrossRef] [PubMed]
  2. Y. Nomura, R. Horlein, P. Tzallas, B. Dromey, S. Rykovanov, Zs. Major, J. Osterhoff, S. Karsch, L. Veisz, M. Zepf, D. Charalambidis, F. Krausz, and G. D. Tsakiris, “Attosecond phase locking of harmonics emitted from laser-produced plasmas,” Nat. Phys. 5, 124–128 (2009). [CrossRef]
  3. M. Geissler, J. Schreiber, and J. M. ter Vehn, “Bubble acceleration of electrons with few-cycle laser pulses,” N. J. Phys. 8, 186 (2006). [CrossRef]
  4. G. D. Tsakiris, K. Eidmann, J. M. ter Vehn, and F. Krausz, “Route to intense single attosecond pulses,” N. J. Phys. 8, 19 (2006). [CrossRef]
  5. P. Dietrich, F. Krausz, and P. B. Corkum, “Determining the absolute carrier phase of a few-cycle laser pulse,” Opt. Lett. 25, 16–18 (2000). [CrossRef]
  6. Zs. Major, S. Trushin, I. Ahmad, and M. Siebold, Chr. Wandt, S. Klingebiel, T. Wang, J. A. Fülöp, A. Henig, S. Kruber, R. Weingartner,A. Popp, J. Osterhoff, R. Hörlein, J. Hein, V. Pervak, A. Apolonski, F. Krausz, and S. Karsch, “Basic concepts and current status of the petawatt field synthesizer-a new approach to ultrahigh field generation,” Review of Laser Engineering 37, 431–436 (2009).
  7. I. Ahmad, S. Trushin, Zs. Major, C. Wandt, S. Klingebiel, T.-J. Wang, V. Pervak, A. Popp, M. Siebold, F. Krausz, and S. Karsch, “Frontend light source for short-pulse pumped opcpa system,” Appl. Phys. B 97, 529–536 (2009). [CrossRef]
  8. O. V. Chekhlov, J. L. Collier, I. N. Ross, P. K. Bates, M. Notley, C. Hernandez-Gomez, W. Shaikh, C. N. Danson, D. Neely, P. Matousek, S. Hancock, and L. Cardoso, “35 j broadband femtosecond optical parametric chirped pulse amplification system,” Opt. Lett. 31, 3665–3667 (2006). [CrossRef] [PubMed]
  9. V. V. Lozhkarev, G. I. Freidman, V. N. Ginzburg, E. V. Katin, E. A. Khazanov, A. V. Kirsanov, G. A. Luchinin, A. N. Mal’shakov, M. A. Martyanov, O. V. Palashov, A. K. Poteomkin, A. M. Sergeev, A. A. Shaykin, and I. V. Yakovlev, “Compact 0.56 Petawatt laser system based on optical parametric chirped pulse amplification in KD*P crystals,” Laser Phys. Lett. 4, 421–427 (2007). [CrossRef]
  10. D. Herrmann, L. Veisz, R. Tautz, F. Tavella, K. Schmid, V. Pervak, and F. Krausz, “Generation of sub-threecycle, 16 tw light pulses by using noncollinear optical parametric chirped-pulse amplification,” Opt. Lett. 34, 2459–2461 (2009). [CrossRef] [PubMed]
  11. J. Tümmler, R. Jung, H. Stiel, P. V. Nickles, and W. Sandner, “High-repetition-rate chirped-pulse-amplification thin-disk laser system with joule-level pulse energy,” Opt. Lett. 34, 1378–1380 (2009). [CrossRef] [PubMed]
  12. T. Metzger, A. Schwarz, C. Y. Teisset, D. Sutter, A. Killi, R. Kienberger, and F. Krausz, “High-repetition-rate picosecond pump laser based on a yb:yag disk amplifier for optical parametric amplification,” Opt. Lett. 34, 2123–2125 (2009). [CrossRef] [PubMed]
  13. M. Siebold, J. Hein, C. Wandt, S. Klingebiel, F. Krausz, and S. Karsch, “High-energy, diode-pumped, nanosecond Yb:YAG MOPA system,” Opt. Express 16, 3674–3679 (2008). [CrossRef] [PubMed]
  14. Chr. Wandt, S. Klingebiel, M. Siebold, Zs. Major, J. Hein, F. Krausz, and S. Karsch, “Generation of 220mJ nanosecond pulses at a 10Hz repetition rate with excellent beam quality in a diode-pumped Yb:YAG MOPA system,” Opt. Lett. 33, 1111–1113 (2008). [CrossRef] [PubMed]
  15. P. Banks, M. Perry, V. Yanovsky, S. Fochs, B. Stuart, and J. Zweiback, “Novel all-reflective stretcher for chirpedpulse amplification of ultrashort pulses,” IEEE J. Quantum Electron. 36, 268–274 (2000). [CrossRef]
  16. E. Treacy, “Optical pulse compression with diffraction gratings,” IEEE J. Quantum Electron. 5, 454–458 (1969). [CrossRef]

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