Strong field laser control of photochemistry

2015 ◽  
Vol 17 (20) ◽  
pp. 13183-13200 ◽  
Author(s):  
Ignacio R. Solá ◽  
Jesús González-Vázquez ◽  
Rebeca de Nalda ◽  
Luis Bañares
Keyword(s):  
Laser Light ◽  
Strong Field ◽  
Photochemical Reactions ◽  
Ultrafast Laser ◽  
Potential Surfaces ◽  
Laser Control

Intense ultrafast laser light is used as an additional reagent for steering photochemical reactions by dressing the potential surfaces where the atoms move.

Ablation and thermal effects in treatment of hard and soft materials and biotissues using ultrafast-laser pulse-train bursts

2012 ◽  
Vol 1 (3) ◽  
Author(s):  
Robin S. Marjoribanks ◽  
Christian Dille ◽  
Joshua E. Schoenly ◽  
Luke McKinney ◽  
Aghapi Mordovanakis ◽  
...  
Keyword(s):  
Pulse Train ◽  
Soft Tissues ◽  
Strong Field ◽  
Laser System ◽  
Soft Materials ◽  
Laser Pulses ◽  
Ultrafast Laser ◽  
Field Mode ◽  
Ultrafast Laser Pulses ◽  
Tissue Therapy

AbstractUltrafast laser pulses (≤1 ps) are qualitatively different in the nature of their interaction with materials, including biotissues, as compared to nanosecond or longer pulses. This can confer pronounced advantages in outcomes for tissue therapy or laser surgery. At the same time, there are distinct limitations of their strong-field mode of interaction. As an alternative, it is shown here that ultrafast laser pulses delivered in a pulse-train burst mode of radiant exposure can access new degrees of control of the interaction process and of the heat left behind in tissues. Using a laser system that delivers 1 ps pulses in 20 μs pulse-train bursts at 133 MHz repetition rates, a range of heat and energy-transfer effects on hard and soft tissue have been studied. The ablation of tooth dentin and enamel under various conditions, to assess the ablation rate and characterize chemical changes that occur, are reported. This is compared to ablation in agar gels, useful live-cell-culture phantom of soft tissues, and presenting different mechanical strength. Study of aspects of the optical science of laser-tissue interaction promises to make qualitative improvements to medical treatments using lasers as cutting and ablative tools.

Ultrafast laser control of electron dynamics in atoms, molecules and solids

2011 ◽  
Vol 153 ◽  
pp. 9 ◽  
Author(s):  
Matthias Wollenhaupt ◽  
Thomas Baumert
Keyword(s):  
Ultrafast Laser ◽  
Electron Dynamics ◽  
Laser Control

scholarly journals Development of ultrafast laser-based x-ray in-vivo phase-contrast micro-CT beamline for biomedical applications at Advanced Laser Light Source (ALLS)

2008 ◽  
Author(s):  
Russell Kincaid ◽  
Andrzej Krol ◽  
Sylvain Fourmaux ◽  
Jean-Claude Kieffer ◽  
Cristina Serbanescu ◽  
...  
Keyword(s):  
Light Source ◽  
Biomedical Applications ◽  
Phase Contrast ◽  
Laser Light ◽  
Ultrafast Laser ◽  
Micro Ct ◽  
X Ray ◽  
Laser Light Source

scholarly journals Ultrafast Hole Deformation Revealed by Molecular Attosecond Interferometry

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yindong Huang ◽  
Jing Zhao ◽  
Zheng Shu ◽  
Yalei Zhu ◽  
Jinlei Liu ◽  
...  
Keyword(s):  
Wave Packet ◽  
Terahertz Spectroscopy ◽  
Strong Field ◽  
High Harmonic ◽  
Photochemical Reactions ◽  
Pulse Generation ◽  
Joint Measurement ◽  
Electron Wave Packet ◽  
Rotational Wave ◽  
And Control

Understanding the evolution of molecular electronic structures is the key to explore and control photochemical reactions and photobiological processes. Subjected to strong laser fields, electronic holes are formed upon ionization and evolve in the attosecond timescale. It is crucial to probe the electronic dynamics in real time with attosecond-temporal and atomic-spatial precision. Here, we present molecular attosecond interferometry that enables the in situ manipulation of holes in carbon dioxide molecules via the interferometry of the phase-locked electrons (propagating in opposite directions) of a laser-triggered rotational wave packet. The joint measurement on high-harmonic and terahertz spectroscopy (HATS) provides a unique tool for understanding electron dynamics from picoseconds to attoseconds. The optimum phases of two-color pulses for controlling the electron wave packet are precisely determined owing to the robust reference provided with the terahertz pulse generation. It is noteworthy that the contribution of HOMO-1 and HOMO-2 increases reflecting the deformation of the hole as the harmonic order increases. Our method can be applied to study hole dynamics of complex molecules and electron correlations during the strong-field process. The threefold control through molecular alignment, laser polarization, and the two-color pulse phase delay allows the precise manipulation of the transient hole paving the way for new advances in attochemistry.

scholarly journals Strong Field Multiphoton Inversion of a Three-Level System Using Shaped Ultrafast Laser Pulses

2008 ◽  
Vol 100 (23) ◽  
Author(s):  
Stephen D. Clow ◽  
Carlos Trallero-Herrero ◽  
Thomas Bergeman ◽  
Thomas Weinacht
Keyword(s):  
Strong Field ◽  
Laser Pulses ◽  
Ultrafast Laser ◽  
Level System ◽  
Ultrafast Laser Pulses
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