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Related Concept Videos

Pulse01:16

Pulse

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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...
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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.
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Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.
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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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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.
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Chromatin Isolation by RNA Purification ChIRP
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Chirped-pulse-amplification seed source through direct phase modulation.

R Xin, J D Zuegel

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    Summary
    This summary is machine-generated.

    A new directly chirped laser source (DCLS) was integrated into a high-energy optical parametric chirped-pulse-amplification (OPCPA) system. This integration enables efficient amplification and compression of nanosecond laser pulses for advanced applications.

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    Area of Science:

    • Laser physics
    • Nonlinear optics
    • Ultrashort pulse generation

    Background:

    • High-energy laser systems are crucial for various scientific applications.
    • Optical parametric chirped-pulse amplification (OPCPA) is a key technology for generating high-energy laser pulses.
    • Seeding OPCPA systems with appropriate laser sources is essential for performance.

    Purpose of the Study:

    • To integrate a novel all-fiber directly chirped laser source (DCLS) into an OPCPA system.
    • To evaluate the performance of DCLS as a seed source for high-energy amplification.
    • To demonstrate efficient amplification and compression of chirped laser pulses.

    Main Methods:

    • Development of an all-fiber directly chirped laser source (DCLS) producing nanosecond, linearly chirped pulses at 1053 nm.
    • Integration of DCLS into a high-energy OPCPA system.
    • Temporal phase modulation to generate a quadratic phase, resulting in a 1-ns pulse with a 3-nm bandwidth.
    • Amplification to 76 mJ and subsequent compression to a 1.5-ps pulse width.

    Main Results:

    • Successful integration of DCLS into the OPCPA system.
    • Amplification of the chirped pulse to 76 mJ energy.
    • Achieved pulse compression close to the Fourier transform limit, with a 1.5-ps intensity autocorrelation width.
    • Demonstrated the capability of DCLS to seed high-energy OPCPA systems effectively.

    Conclusions:

    • The directly chirped laser source (DCLS) is a viable and effective seed source for high-energy OPCPA systems.
    • The integrated system demonstrates efficient generation of high-energy, compressed laser pulses.
    • This advancement opens possibilities for more compact and robust high-energy laser systems.