Adaptive feedback control of ultrafast semiconductor nonlinearities

Kunde, J.; Baumann, B.; Arlt, Sebastian; Morier‐Genoud, F.; Siegner, U.; Keller, U.

doi:10.1063/1.1288603

Cited by 81 publications

(56 citation statements)

References 18 publications

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“…Femtosecond laser pulse shapers and learning loops have been used for automated pulse compression and optimized generation of arbitrary laser pulse shapes, [74,82±90] control of two-photon transitions in atoms, [91,92] shaping of Rydberg wavepackets, [93] optimization of high-harmonic generation, [94] and control of ultrafast semiconductor nonlinearities. [95] Shaped electric fields have also been suggested to be of use in the context of laser cooling.…”

Section: Optimization Proceduresmentioning

confidence: 99%

Quantum Control of Gas‐Phase and Liquid‐Phase Femtochemistry

Brixner¹,

Gerber²

2003

ChemPhysChem

374

288

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Active control of chemical reactions on a microscopic (molecular) level, that is, the selective breaking or making of chemical bonds, is an old dream. However, conventional control agents used in chemical synthesis are macroscopic variables such as temperature, pressure or concentration, which gives no direct access to the quantum-mechanical reaction pathway. In quantum control, by contrast, molecular dynamics are guided with specifically designed light fields. Thus it is possible to efficiently and selectively reach user-defined reaction channels. In the last years, experimental techniques were developed by which many breakthroughs in this field were achieved. Femtosecond laser pulses are manipulated in so-called pulse shapers to generate electric field profiles which are specifically adapted to a given quantum system and control objective. The search for optimal fields is guided by an automated learning loop, which employs direct feedback from experimental output. Thereby quantum control over gas-phase as well as liquid-phase femtochemical processes has become possible. In this review, we first discuss the theoretical and experimental background for many of the recent experiments treated in the literature. Examples from our own research are then used to illustrate several fundamental and practical aspects in gas-phase as well as liquid-phase quantum control. Some additional technological applications and developments are also described, such as the automated optimization of the output from commercial femtosecond laser systems, or the control over the polarization state of light on an ultrashort timescale. The increasing number of successful implementations of adaptive learning techniques points at the great versatility of computer-guided optimization methods. The general approach to active control of light-matter interaction has also applications in many other areas of modern physics and related disciplines.

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Section: Optimization Proceduresmentioning

confidence: 99%

Quantum Control of Gas‐Phase and Liquid‐Phase Femtochemistry

Brixner¹,

Gerber²

2003

ChemPhysChem

374

288

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“…In this fashion, effective dynamical bandwidth can be created and exploited. The many emerging successful experiments [25][26][27][28][29][30][31][32][33][34][35] attest to the capabilities of this technique, especially playing on the large numbers of laser pulse shaper pixels to tailor the photonic reagents to have the right structure to meet the posed molecular objectives. The controlled atomic-scale events demonstrated thus far range from A learning algorithm guides the pulse shaper to optimize tailored laser pulses to act as photonic reagents.…”

Section: What Are the Capabilities Of Shaped Laser Pulses Actingmentioning

confidence: 99%

“…Highspeed pattern recognition software is necessary to rapidly make the decisions on how to adjust the laser after each experiment. A sketch of an overall apparatus incorporating these collective concepts is shown in Figure 3, and all the current laser control experiments achieving complex objectives [25][26][27][28][29][30][31][32][33][34][35] operate in the fashion indicated. Experiments of this type were first suggested 20 in 1992, followed by several years of simulations 36 indicating their potential capabilities until the first actual laboratory study was undertaken in 1997.…”

Section: ε(T)mentioning

confidence: 99%

Controlling quantum dynamics phenomena

Rabitz

2008

SPIE Proceedings

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Since the initial development of lasers in the 1960's, a longstanding dream has been to utilize these special intense radiation (light) sources to redirect the outcome of chemical reactions. In the ensuing years, much effort has gone into attempts at making this dream a reality. Emerging recent successful experiments derive from a confluence of ultrafast laser technology, control theory concepts, and suitable pattern recognition algorithms all drawn together to form adaptive machines. The adaptive machines are being used to manipulate chemical bonds, as well as a broad variety of other atomic and molecular dynamics phenomenon. These advances rest on the ability to delicately shape laser pulses so that they act as a special type of photonic reagents.

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“…Quantum control through shaped laser pulses has been demonstrated in a number of experiments showing control over atomic [8], molecular [9,10], and solid state systems [11].…”

Section: Introductionmentioning

confidence: 99%