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• W27907855 abstract "The petawatt field synthesizer (PFS) is a high-power optical parametric chirped-pulseamplification (OPCPA) system under development, which aims at generating fewcyclepulses with high energies of several Joule. The availability of light pulses withthese unique parameters will enable an efficient generation of even shorter attosecondpulses with significantly higher photon flux than achievable today [1]. Notonly the real-time observation, but also the control of charge transfer in molecularsystems will become feasible for the first time [2].The technique for realizing the ambitious PFS specifications is short-pulse pumpedOPCPA in mm-thin crystals. The reduced crystal thickness allows for ultra-broadbandamplification. The pump-pulse duration is reduced to a picosecond—compared to100 ps to nanosecond pump-pulse duration in conventional high power OPCPA systems.The shortened pulse duration facilitates higher pump intensities whereby anefficient amplification in the mm-thin crystals is achieved.The demonstration of this novel scheme in the PFS project will allow its use inthe extreme light infrastructure (ELI)[3]—a pan-European high-power laser project.Based on the PFS technology for the front end, the ELI will generate exawatt peakpowerpulses and therefore facilitate the study of laser-matter interaction in an unprecedentedintensity range [4].This work describes the CPA-aspects of a suitable chirped pulse amplification (CPA)pump laser for the PFS OPCPA system. The diode-pumped Yb:YAG amplifiers up toan energy of 300 mJ (at 1030 nm) are presented in combination with the dispersionmanagement. The application of spectral-amplitude shaping in conjunction withan Yb:glass amplifier with broader bandwidth than Yb:YAG enables an unprecedentedbandwidth of 3.5nm in the Yb:YAG amplifier at this energy level. Simulationsshow that a similar bandwidth can be maintained for the full amplifier system.The pulses with 200 mJ could be compressed to 900 fs, close to the transform limit.Later changes in the stretcher increase the bandwidth more and compression downto 740 fs is demonstrated. To date, these are the highest peak power pulses generatedin Yb:YAG. For the application as OPCPA pump, the so generated pulses arefrequency doubled in a DKDP crystal.Another key aspect of this work is the synchronization of the OPCPA pump andsignal pulses. In spite of optical synchronization of both pulses, a large timing fluctuationbetween these pulses is measured at the first OPCPA stage. The high accuracyjitter measurement setup and a series of measurements, which showed that thestretcher/compressor setup is the main source of jitter, are presented. Theoreticalinvestigations yield that the optical delay in a compressor is orders of magnitudemore sensitive to angle changes compared to free space propagation. This makes thestretcher and compressor extremely sensitive for timing jitter caused by turbulentair or mechanical instabilities. This novel insight helped us to significantly reducethe jitter to 100 fs and to demonstrate the feasibility of the PFS concept with firstbroad-band OPCPA experiments." @default.
• W27907855 created "2016-06-24" @default.
• W27907855 creator A5016743633 @default.
• W27907855 date "2013-07-15" @default.
• W27907855 modified "2023-09-27" @default.
• W27907855 title "Picosecond pump dispersion management and jitter stabilization in a petawatt-scale few-cycle OPCPA system" @default.
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