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Related Concept Videos

The Cardiac Cycle01:13

The Cardiac Cycle

The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and empty blood into the...
Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
Cell Motility through Blebbing01:16

Cell Motility through Blebbing

Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Vascular Spasm01:16

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
Cardiac Cycle01:29

Cardiac Cycle

The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
During the cardiac cycle, blood flow through the heart is regulated entirely by changing pressure gradients. This sequence of events begins with the heart in a state of total relaxation, known as mid-to-late diastole, during which blood passively flows from...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.

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Related Experiment Video

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Robust Isolated Attosecond Pulse Generation with Self-Compressed Subcycle Drivers from Hollow Capillary Fibers.

Marina Fernández Galán1,2, Javier Serrano1,2, Enrique Conejero Jarque1,2

  • 1Grupo de Investigación en Aplicaciones del Láser y Fotónica, Departamento de Física Aplicada, Universidad de Salamanca, Salamanca, 37008, Spain.

ACS Photonics
|April 22, 2024
PubMed
Summary

This study presents a novel method for generating isolated attosecond pulses (IAPs) using hollow capillary fibers and multicycle infrared drivers. This breakthrough simplifies IAP production, enabling advanced ultrafast applications.

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Area of Science:

  • Quantum optics
  • Attosecond science
  • Nonlinear optics

Background:

  • High-order harmonic generation (HHG) provides coherent extreme-ultraviolet and soft X-ray radiation.
  • Isolated attosecond pulses (IAPs) are crucial for precise electron dynamics control in ultrafast applications.
  • Generating IAPs typically requires complex, near-single-cycle driving fields.

Purpose of the Study:

  • To theoretically demonstrate a novel, straightforward, and compact method for generating IAPs.
  • To utilize multicycle infrared drivers for IAP production.
  • To overcome technological challenges associated with current IAP generation techniques.

Main Methods:

  • Theoretical demonstration of a new scheme using hollow capillary fibers (HCFs).
  • Extreme soliton self-compression of multicycle infrared pulses in a HCF with decreasing pressure.
  • Driving HHG in a gas target with the generated light transient.

Main Results:

  • Continuous emission of high-contrast IAPs, nearly independent of carrier-envelope phase (CEP).
  • A carrier-envelope phase-robust and stable scheme for IAP generation.
  • Demonstration of IAP generation from multicycle infrared drivers, overcoming efficiency limitations.

Conclusions:

  • The proposed scheme offers a straightforward and compact method for IAP generation.
  • This approach enables the development of integrated all-fiber IAP sources.
  • The findings pave the way for advancing precision control of electron dynamics in ultrafast science.