Controlling the photoluminescence of gallium arsenide with trains of ultrashort laser pulses

Hu, Zhixiong; Singha, Sima

doi:10.1103/physrevb.82.115204

Cited by 10 publications

(14 citation statements)

References 50 publications

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“…The 4f pulse shaper, consisting of two gratings, two cylindrical lenses, and a two-mask spatial light modulator (SLM), was used to shape the femtosecond laser . As a popular tool for coherent control, pulse shaping provides the ability to manipulate the temporal shape and polarization of the laser pulse . In this experiment, we produced a temporally delayed pulse pair with orthogonal polarizations using the slope phase, i.e., a linear phase with an inverse sign in two masks of the SLM, which can be expressed as where ϕ 1 (ω) and ϕ 2 (ω) are the phases loaded to each mask of the SLM.…”

Section: Methodsmentioning

confidence: 99%

Tracing the Coherent Manipulation of Rotational Dynamics by Shaped Femtosecond Pulse-Induced Two-Dimensional Rotational Coherent Spectrum

Lian

et al. 2021

J. Phys. Chem. A

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The temporal delayed orthogonal pulse pairs generated by the phase shaping technique are used to study the coherent control of the rotational wave packet dynamics in air. By continuously changing the intrapulse delay of the pump pulse, we measured the corresponding revival signals and obtained a two-dimensional rotational coherent spectrum (2D RCS). An additive property of the rotational dynamics is observed from the revival signals. Moreover, combining with the coherent control model, we find that the 2D RCS can be used to demonstrate the control over the underlying Raman rotational excitation. A beat frequency-dependent oscillation of each rotational transition is obtained. The transition process is revealed from the Fourier transformation about the pump delay. The scheme of this work can be used for further control and detection of the rotational wave packet and can be extended to other molecular dynamic researches.

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Section: Methodsmentioning

confidence: 99%

Tracing the Coherent Manipulation of Rotational Dynamics by Shaped Femtosecond Pulse-Induced Two-Dimensional Rotational Coherent Spectrum

Lian

et al. 2021

J. Phys. Chem. A

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“…The effect of laser pulse bandwidth and phase on the plasma optical emission intensity has been studied [215]. Significant photoluminescence intensity enhancement has been observed in the shaped pulse ablation of GaAs [216,217]. It was proposed that the control was achieved by coherent manipulation of plasma electrons, which in turn excite lattice phonons.…”

Section: Laser Machiningmentioning

confidence: 99%

Manipulation of matter with shaped-pulse light field and its applications

Lian

Fei

et al. 2021

Advances in Physics: X

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This review focuses on the properties of the light fields that are more useful in applications. We review recent means of generating shaped-pulse light field, by which matters can be steered toward the desired products, thereby allowing the coherent control in terms of effectiveness, selectivity and manipulation. Applications of these light fields are discussed, including bioscience, laser machining, novel material fabrication, trace material detection and military.

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“…A variety of phase functions were applied to the AOM to produce different shaped UV laser pulses. These included a sine phase to generate sequences of evenly spaced TL pulses, [29][30][31][32] a V-shaped phase to produce a pulse pair, and a quadratic phase to produce chirped pulses.…”

Section: Methodsmentioning

confidence: 99%

Coherent phase control of internal conversion in pyrazine

Seideman

Singha

et al. 2015

The Journal of Chemical Physics

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Shaped ultrafast laser pulses were used to study and control the ionization dynamics of electronically excited pyrazine in a pump and probe experiment. For pump pulses created without feedback from the product signal, the ion growth curve (the parent ion signal as a function of pump/probe delay) was described quantitatively by the classical rate equations for internal conversion of the S 2 and S 1 states. Very different, non-classical behavior was observed when a genetic algorithm (GA) was used to minimize the ion signal at some pre-determined target time, T. Two qualitatively different control mechanisms were identified for early (T< 1.5 ps) and late (T> 1.5 ps) target times. In the former case, the ion signal was largely suppressed for t < T , while for t T the ion signal produced by the GA-optimized pulse and a transform limited (TL) pulse coalesced. In contrast, for T > 1.5 ps the ion growth curve followed the classical rate equations for t < T , while for t T the quantum yield for the GA-optimized pulse was much smaller than for a TL pulse. We interpret the first type of behavior as an indication that the wave packet produced by the pump laser is localized in a region of the S 2 potential energy surface where the vertical ionization energy exceeds the probe photon energy, whereas the second type of behavior may be described by a reduced absorption cross section for S 0 → S 2 followed by incoherent decay of the excited molecules. * rjgordon@uic.edu 2

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Controlling the photoluminescence of gallium arsenide with trains of ultrashort laser pulses

Cited by 10 publications

References 50 publications

Tracing the Coherent Manipulation of Rotational Dynamics by Shaped Femtosecond Pulse-Induced Two-Dimensional Rotational Coherent Spectrum

Tracing the Coherent Manipulation of Rotational Dynamics by Shaped Femtosecond Pulse-Induced Two-Dimensional Rotational Coherent Spectrum

Manipulation of matter with shaped-pulse light field and its applications

Coherent phase control of internal conversion in pyrazine

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