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| 2. |
- Harth, A., et al.
(författare)
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Few-cycle high-repetition rate OPCPA for multiphoton PEEM towards atto-PEEM
- 2016
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Ingår i: International Conference on Ultrafast Phenomena, UP 2016. - 9781943580187 ; Part F20-UP 2016
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Konferensbidrag (refereegranskat)abstract
- We present a few-cycle high-repetition rate optical parametric amplifier for multiphoton PEEM experiments on semiconductor nanowires. This parametric amplifier is also used for the generation of high-order harmonics at 200kHz for future atto-PEEM experiments.
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| 3. |
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| 4. |
- Matyschok, Jan, et al.
(författare)
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Compact, high-repetition-rate OPCPA system for high harmonic generation
- 2014
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Ingår i: Frontiers in Ultrafast Optics : Biomedical, Scientific, and Industrial Applications XIV - Biomedical, Scientific, and Industrial Applications XIV. - : SPIE. - 9780819498854 ; 8972
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Konferensbidrag (refereegranskat)abstract
- A compact, high-repetition rate optical parametric chirped pulse amplifier system emitting CEP-stable, few-cycle pulses with 10 μJ of pulse energy is reported for the purpose of high-order harmonic generation. The system is seeded from a commercially available, CEP-stabilized Ti:sapphire oscillator, delivering an octave-spanning spectrum from 600-1200 nm. The oscillator output serves on the one hand as broadband signal for the parametric amplification process and on the other hand as narrowband seed for an Ytterbium-based fiber preamplifier with subsequent main amplifiers and frequency doubling. Broadband parametric amplification up to 17 μJ at 200 kHz repetition rate was achieved in two 5 mm BBO crystals using non-collinear phase matching in the Poynting-vector-walk-off geometry. Efficient pulse compression down to 6.3 fs is achieved with chirped mirrors leading to a peak power exceeding 800 MW. We observed after warm-up time a stability of < 0.5 % rms over 100 min. Drifts of the CE-phase in the parametric amplifier part could be compensated by a slow feedback to the set point of the oscillator phase lock. The CEP stability was measured to be better than 80 mrad over 15 min (3 ms integration time). The experimentally observed output spectra and energies could be well reproduced by simulations of the parametric amplification process based on a (2+1)-dimensional nonlinear propagation code, providing important insight for future repetition rate scaling of OPCPA systems. The system is well-suited for attosecond science experiments which benefit from the high repetition rate. First results for high-order harmonic generation in argon will be presented.
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| 5. |
- Matyschok, Jan, et al.
(författare)
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Temporal and spatial effects inside a compact and CEP stabilized, few-cycle OPCPA system at high repetition rates
- 2013
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Ingår i: Optics Express. - 1094-4087. ; 21:24, s. 29656-29665
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Tidskriftsartikel (refereegranskat)abstract
- We present a compact and ultra-stable few-cycle OPCPA system. In two non-collinear parametric amplification stages pulse energies up to 17 mu J at 200 kHz repetition rate are obtained. Recompression of the broadband pulses down to 6.3 fs is performed with chirped mirrors leading to peak powers above 800 MW. The parametric amplification processes were studied in detail employing (2 + 1) dimensional numerical simulations and compared to experimental observations in terms of spectral shapes, pulse energy, spatial effects as well as delay dependent nonlinear mixing products. This gives new insights into the parametric process and design guidelines for high repetition rate OPCPA systems. (C) 2013 Optical Society of America
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| 6. |
- Mikaelsson, Sara, et al.
(författare)
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Spatio-temporal characterization and optimization of a 200-kHz OPCPA laser system
- 2018
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Ingår i: CLEO : Science and Innovations, CLEO_SI 2018 - Science and Innovations, CLEO_SI 2018. - 9781557528209 ; Part F94-CLEO_SI 2018
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Konferensbidrag (refereegranskat)abstract
- We present measurements on a few cycle OPCPA laser chain where due to careful characterization and compensation of the spectral phase and spatio-temporal couplings, we are able achieve efficient HHG with very low pulse energy.
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| 7. |
- Miranda, Miguel, et al.
(författare)
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Measurement and correction of spectral phase in a few-cycle parametric amplifier
- 2018
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Ingår i: Ultrafast Optics 2017 : Abstract Book - Abstract Book. - 0277-786X .- 1996-756X. - 9781510617162 ; 10606, s. 75-75
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Konferensbidrag (refereegranskat)abstract
- We study the spectral phase introduced by parametric amplification and how high extraction efficiency of energy leads to deterioration of the phase. Avoiding this regime, and using a pulse shaper, we achieve high-contrast ultrashort pulses.
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| 8. |
- Miranda, Miguel, et al.
(författare)
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Ultrashort laser pulse characterization from dispersion scans : A comparison with SPIDER
- 2013
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Ingår i: 2013 Conference on Lasers and Electro-Optics, CLEO 2013. - 9781557529725 - 9781557529732
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Konferensbidrag (refereegranskat)abstract
- We investigate the performance of the recently introduced 'd-scan' technique for the characterization of ultrashort laser pulses by comparing it with a well-established technique (SPIDER). Good agreement is obtained from the two different measurements.
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| 9. |
- Morgner, Uwe, et al.
(författare)
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Few-cycle and phase stable OPCPA systems with high repetition rate
- 2015
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Ingår i: CLEO : Science and Innovations, CLEO-SI 2015 - Science and Innovations, CLEO-SI 2015. - 9781557529688
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Konferensbidrag (refereegranskat)abstract
- We present different approaches for high repetition rate, few-cycle pulse generation with μJ-level energy from compact OPCPA systems. The sources are based on octave spanning Ti:Sa oscillators with all-optical synchronization to state-of-the-art Ytterbium based amplifiers.
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| 10. |
- Rudawski, Piotr, et al.
(författare)
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Carrier-envelope phase dependent high-order harmonic generation with a high-repetition rate OPCPA-system
- 2015
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Ingår i: European Physical Journal D. Atomic, Molecular, Optical and Plasma Physics. - : Springer Science and Business Media LLC. - 1434-6060. ; 69:3
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Tidskriftsartikel (refereegranskat)abstract
- We study high-order harmonic generation with a high-repetition rate (200 kHz), few-cycle, driving laser, based on optical parametric chirped pulse amplification. The system delivers carrier-envelope phase stable, 8 fs, 10 mu J pulses at a central wavelength of 890 nm. High-order harmonics, generated in a high-pressure Ar gas jet, exhibit a strong CEP-dependence over a large spectral range owing to excellent stability of the driving laser pulses. This range can be divided into three spectral regions with distinct CEP influence. The observed spectral interference structures are explained by an analytical model based upon multiple pulse interferences.
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