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Pulse

Pulse

When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...

Pulse

Pulse

The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

Pulse Oximetry

Pulse Oximetry

Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...

Regulation of Pulse

Regulation of Pulse

Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.

Pulse rhythm

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...

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Related Experiment Video

Updated: Feb 13, 2026

Author Spotlight: Advancements and Applications in Nanoparticle Synthesis Through Laser Ablation in Liquids

Author Spotlight: Advancements and Applications in Nanoparticle Synthesis Through Laser Ablation in Liquids

Published on: June 16, 2023

Ultrafast Pulse Generation in an Organic Nanoparticle-Array Laser.

Konstantinos S Daskalakis¹, Aaro I Väkeväinen¹, Jani-Petri Martikainen¹

¹COMP Centre of Excellence, Department of Applied Physics , Aalto University School of Science , FI-00076 Aalto , Finland.

|March 21, 2018

Summary

Researchers developed an organic dye nanoparticle-array laser demonstrating over 100 GHz modulation bandwidth. Lasing speed is tunable via array parameters, with faster dynamics observed for specific plasmonic modes.

Keywords:

Plasmonics metallic nanoparticle arrays organic gain surface lattice resonance ultrafast lasing

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

Area of Science:

Optics and Photonics
Materials Science
Nanoscience

Background:

Nanoscale coherent light sources are crucial for ultrafast optical switches and sensors.
Plasmonic nanostructures combined with organic gain materials offer a promising route to nanolasers due to high field confinement and fabrication flexibility.

Purpose of the Study:

To experimentally investigate the lasing dynamics of organic dye nanoparticle-array lasers.
To demonstrate and characterize the modulation bandwidth of such nanolasers.

Main Methods:

Fabrication of an organic dye nanoparticle-array laser.
Experimental characterization of lasing dynamics and modulation bandwidth.
Tuning of array parameters to influence lasing speed.

Main Results:

Demonstrated the first organic dye nanoparticle-array laser with a modulation bandwidth exceeding 100 GHz.
Showcased that lasing modulation speed can be tuned by adjusting array parameters.
Observed accelerated dynamics for plasmonic lasing modes on the blue-shifted side of the dye emission spectrum.

Conclusions:

Organic dye nanoparticle-array lasers are viable for high-speed modulation applications.
Array parameters offer a method to control and optimize laser modulation speeds.
Understanding plasmonic mode dynamics is key to achieving ultrafast performance in nanolasers.