Pulse (music)
View article
Algorithmic Principles of Remote PPG Open
This paper introduces a mathematical model that incorporates the pertinent optical and physiological properties of skin reflections with the objective to increase our understanding of the algorithmic principles behind remote photoplethysmo…
View article
Self‐Powered Real‐Time Arterial Pulse Monitoring Using Ultrathin Epidermal Piezoelectric Sensors Open
Continuous monitoring of an arterial pulse using a pressure sensor attached on the epidermis is an important technology for detecting the early onset of cardiovascular disease and assessing personal health status. Conventional pulse sensor…
View article
Real-Time Observation of the Buildup of Soliton Molecules Open
Real-time spectroscopy access to ultrafast fiber lasers opens new opportunities for exploring complex soliton interaction dynamics. Here, we have reported the first observation, to the best of our knowledge, of the entire buildup process o…
View article
Real-Time Observation of Internal Motion within Ultrafast Dissipative Optical Soliton Molecules Open
Real-time access to the internal ultrafast dynamics of complex dissipative optical systems opens new explorations of pulse-pulse interactions and dynamic patterns. We present the first direct experimental evidence of the internal motion of…
View article
Resolving the build-up of femtosecond mode-locking with single-shot spectroscopy at 90 MHz frame rate Open
Mode-locked lasers have enabled some of the most precise measurements ever performed, from attosecond time-domain spectroscopy to metrology with frequency combs. However, such extreme precision belies the complexity of the underlying mode-…
View article
Tissue damage thresholds during therapeutic electrical stimulation Open
It is apparent that emerging applications, especially with microelectrodes, will require clinical charge densities that exceed traditional damage thresholds. Experimental data show that stimulation at higher charge densities can be achieve…
View article
Ultrasound Elicits Behavioral Responses through Mechanical Effects on Neurons and Ion Channels in a Simple Nervous System Open
Focused ultrasound has been shown to stimulate excitable cells, but the biophysical mechanisms behind this phenomenon remain poorly understood. To provide additional insight, we devised a behavioral-genetic assay applied to the well-charac…
View article
Relation between blood pressure and pulse wave velocity for human arteries Open
Significance Continuous, cuffless, and noninvasive blood pressure monitoring by measuring the pulse wave velocity is generally considered to be a promising technique for noninvasive measurements. Previously reported relations between blood…
View article
Supergiant pulses from extragalactic neutron stars Open
We consider radio bursts that originate from extragalactic neutron stars (NSs) by addressing three questions about source distances. What are the physical limitations on coherent radiation at GHz frequencies? Do they permit detection at co…
View article
Glymphatic solute transport does not require bulk flow Open
Observations of fast transport of fluorescent tracers in mouse brains have led to the hypothesis of bulk water flow directed from arterial to venous paravascular spaces (PVS) through the cortical interstitium. At the same time, there is ev…
View article
A review of machine learning techniques in photoplethysmography for the non-invasive cuff-less measurement of blood pressure Open
Hypertension or high blood pressure is a leading cause of death throughout the world and a critical factor for increasing the risk of serious diseases, including cardiovascular diseases such as stroke and heart failure. Blood pressure is a…
View article
Hollow-core fibers for high power pulse delivery Open
We investigate hollow-core fibers for fiber delivery of high power ultrashort laser pulses. We use numerical techniques to design an anti-resonant hollow-core fiber having one layer of non-touching tubes to determine which structures offer…
View article
Toward all-day wearable health monitoring: An ultralow-power, reflective organic pulse oximetry sensing patch Open
Ultralow-power organic wearable patches have been developed for all-day monitoring of heart rate and blood oxygen level.
View article
The Gonadotropin-Releasing Hormone Pulse Generator Open
The pulsatile release of GnRH and LH secretion is essential for fertility in all mammals. Pulses of LH occur approximately every hour in follicular-phase females and every 2 to 3 hours in luteal-phase females and males. Many studies over t…
View article
Invited Review Article: Pump-probe microscopy Open
Multiphoton microscopy has rapidly gained popularity in biomedical imaging and materials science because of its ability to provide three-dimensional images at high spatial and temporal resolution even in optically scattering environments. …
View article
Modeling arterial pulse waves in healthy aging: a database for in silico evaluation of hemodynamics and pulse wave indexes Open
The arterial pulse wave (PW) is a rich source of information on cardiovascular (CV) health. It is widely measured by both consumer and clinical devices. However, the physical determinants of the PW are not yet fully understood, and the dev…
View article
Megawatt peak power from a Mamyshev oscillator Open
We demonstrate a fiber source with the best performance from an ultrafast fiber oscillator to date. The ring-cavity Mamyshev oscillator produces ~50-nJ and ~40-fs pulses. The peak power is an order of magnitude higher than that of previous…
View article
Revealing the Transition Dynamics from Switching to Mode Locking in a Soliton Laser Open
Q switching (QS) and mode locking (ML) are the two main techniques enabling generation of ultrashort pulses. Here, we report the first observation of pulse evolution and dynamics in the QS-ML transition stage, where the ML soliton formatio…
View article
Topological Acoustic Delay Line Open
Topological protected wave engineering in artificially structured media is at the frontier of ongoing metamaterials research that is inspired by quantum mechanics. Acoustic analogues of electronic topological insulators have recently led t…
View article
The Apollon 10 PW laser: experimental and theoretical investigation of the temporal characteristics Open
The objective of the Apollon 10 PW project is the generation of 10 PW peak power pulses of 15 fs at $1~\text{shot}~\text{min}^{-1}$ . In this paper a brief update on the current status of the Apollon project is presented, followed by a mor…
View article
Pulse and Surge Profiles of Luteinizing Hormone Secretion in the Mouse Open
Using a new tail-tip bleeding procedure and a sensitive ELISA, we describe here the patterns of LH secretion throughout the mouse estrous cycle; in ovariectomized mice; in ovariectomized, estradiol-treated mice that model estrogen-negative…
View article
Wire Arc Additive Manufacturing of AZ31 Magnesium Alloy: Grain Refinement by Adjusting Pulse Frequency Open
Wire arc additive manufacturing (WAAM) offers a potential approach to fabricate large-scale magnesium alloy components with low cost and high efficiency, although this topic is yet to be reported in literature. In this study, WAAM is preli…
View article
A standardized method to determine the concentration of extracellular vesicles using tunable resistive pulse sensing Open
Background Understanding the pathogenic role of extracellular vesicles (EVs) in disease and their potential diagnostic and therapeutic utility is extremely reliant on in‐depth quantification, measurement and identification of EV sub‐popula…
View article
Ultrafast optical pulse shaping using dielectric metasurfaces Open
Metasurfaces get ultrafast pulses into shape Nanostructured metasurfaces have been designed to function as many passive optical elements. Now, Divitt et al. demonstrate that metasurfaces can also be operated as time-dependent active optica…
View article
High average power and single-cycle pulses from a mid-IR optical parametric chirped pulse amplifier Open
In attosecond and strong-field physics, the acquisition of data in an acceptable time demands the combination of high peak power with high average power. We report a 21 W mid-IR optical parametric chirped pulse amplifier (OPCPA) that gener…
View article
Megahertz serial crystallography Open
The new European X-ray Free-Electron Laser is the first X-ray free-electron laser capable of delivering X-ray pulses with a megahertz inter-pulse spacing, more than four orders of magnitude higher than previously possible. However, to date…
View article
Tellurene-based saturable absorber to demonstrate large-energy dissipative soliton and noise-like pulse generations Open
Two-dimensional layered monoelemental materials (Xenes) with excellent optoelectronic properties have various property-related applications, such as energy, biomedicine, and optoelectronic devices. Xenes also show excellent performance in …
View article
7 μm, ultrafast, sub-millijoule-level mid-infrared optical parametric chirped pulse amplifier pumped at 2 μm Open
We present a novel all-fiber pumped optical parametric chirped pulse amplifier (OPCPA) architecture to generate self-carrier-to-envelope-phase stable, sub-eight-optical-cycle duration pulses at 7 μm wavelength approaching millijoulelevel p…
View article
Neutrino Cloud Instabilities Just above the Neutrino Sphere of a Supernova Open
Most treatments of neutrino flavor evolution, above a surface of the last scattering, take identical angular distributions on this surface for the different initial (unmixed) flavors, and for particles and antiparticles. Differences in the…
View article
Optical π phase shift created with a single-photon pulse Open
A single-photon pulse creates a π phase shift for another light pulse, which is important for optical quantum computation.