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Showing 1 to 14 of 14 for “"Pulse shaper"”.
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Experimental investigation of the dynamics of S1 benzene and the development of a new UV femtosecond pulse shaper
… benzene and the development of a new ultraviolet pulse shaper are presented. The non adiabatic non radiative decay process of benzene in its first excited has been determined using pump probe time resolved photoelectron spectroscopy. An ultrafast oscillation has been found at the onset of the …
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Development of a Wavelet -Based Algorithm and Fitness Function for Computational and Experimental Quantum Control of Intramolecular Vibration Redistribution
… dephasing by interaction with tailored laser pulses, a simple fitness function for control, based only on knowledge of P(t), is developed. Variations of this fitness function are tested in several scenarios to check for robustness and learn about the mechanism of control. Additionally, key …
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Investigation into mid-infrared pulse shaping using an optical parametric oscillator
… indirect spectral transfer of shaped pulses from the near to mid-infrared via the use of an optical parametric oscillator. It was shown that good spectral fidelity of transfer can be achieved by making suitable adjustments to the OPO. The issues affecting the transfer process are …
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Advanced high-power optical parametric oscillators synchronously pumped by ultrafast fibre-based sources
… the generation of ultra short, tunable pulses at high average power and / or high pulse energy using synchronously pumped optical parametric oscillators (OPO) and appropriate power-scalable fibre-amplifier pump sources. Two types of pump sources with average powers up to ~100W are …
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Controlling molecules with lasers and lasers with molecules
… learning algorithms to shape ultrashort laser pulses in order to produce a desired state or state change. Interesting pulse shapes have been able to break chemical bonds, drive chemical reactions, selectively excite molecular states, and most recently, control photoisomerization in proteins [1, …
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Development and Characterisation of a Radiation Hard Readout Chip for the LHCb-Experiment
… of a charge-sensitive preamplifier and a CR-RC pulse shaper. It features an equivalent noise charge of ENC = 497 e + 48.3 e/pF Cin. The analogue memory is a switched capacitor array, which provides a latency of max. 4 us. The 128 channels are transmitted off chip in 900 ns via a current driver. …
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Development, Optimisation and Characterisation of a Radiation Hard Mixed-Signal Readout Chip for LHCb
… preamplifier followed by a CR-RC pulse shaper. The analogue pipeline memory is implemented as a switched capacitor array with a maximum latency of 4us. The 128 analogue channels are multiplexed and transmitted off chip in 900ns via four current output drivers. Beside the pipelined …
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Dynamics of vibrational energy flow, quantum computing and laser assisted fusion
… for one and two qubits gates, using conventional pulse shaper techniques. However, optimal control theory increases the fidelity for a two qubits gate up to 0.9999. In addition, I simulated the dynamics of two bare nuclei (deuterium-tritium) interacting with a shaped femtosecond laser pulse in one …
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Generation of ultrahigh frequency acoustic waves for the characterization of complex materials
… with a novel retroreflection-based ultrafast pulse shaper. It generates optical pulse sequences of frequency tunable between 2-2000 GHz through movement of a single delay line. Optical to acoustic conversion by aluminum transducers yields acoustic waves with bandwidth limited by the metal …
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Adaptive control of electronic excitation utilizing ultrafast laser pulses
… during and after the interaction of matter with pulses of femtosecond laser radiation. The experiments presented here were performed in the gas phase and involve one atomic and several model molecular systems. Absorption of femtosecond laser radiation by these systems induces an electronic …
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Adaptively shaped advanced ultrafast laser sources
… (MIR) regimes. The setup involves shaping a NIR pulse using an adaptively controlled liquid crystal spatial light modulator (LC-SLM) in a pulse shaper. The shaped NIR pulse is then transferred to the MIR via a synchronously pumped optical parametric oscillator (SPOPO).<br/><br/>Initially, …
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Adaptive control of coherent soft X-rays
… ever observed in the laboratory. The attosecond pulses produced are the fundamental tool for the time-resolved study of electron motion in atoms, molecules, clusters, liquids and solids in the future. However, in order to exploit the full potential of this new tool it is necessary to control the …
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Studying Ultrafast Vibrational dynamics of Intramolecular Hydrogen Bonds using Broadband Infrared Pump-Probe Spectroscopy.
… the spectral range of 2-8 microns. The broadband pulse enables us to perform novel experiments in multiple domains (both in infrared and electronic) to understand energy transfer dynamics and vibrational couplings of very broad peaks. The tunable BBIR source is generated by a filamentation process …
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Coherent Control of Molecular Dynamics with Shaped Femtosecond Pulses
… for mode-selective chemistry. The laser pulse tailored to drive the system from the initial to the target state as a perturbation can in general not be determined by a quantum-mechanical calculation, since usually even the Hamiltonian of the system is unknown. A practical alternative is …