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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
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Related Experiment Video

Updated: Feb 9, 2026

How to Build a Laser Speckle Contrast Imaging LSCI System to Monitor Blood Flow
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High-contrast high-intensity repetitive petawatt laser.

Hiromitsu Kiriyama, Alexander S Pirozhkov, Mamiko Nishiuchi

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    |June 2, 2018
    PubMed
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    This summary is machine-generated.

    The J-KAREN-P laser system achieved 63 Joules of energy and over 1 petawatt (PW) peak power. This breakthrough enables new research into fundamental laser-matter interactions at ultra-high intensities.

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    Area of Science:

    • High-energy physics
    • Laser science and technology
    • Plasma physics

    Background:

    • Advanced laser systems are crucial for exploring fundamental physics.
    • The J-KAREN-P laser facility aims to achieve unprecedented laser parameters.

    Purpose of the Study:

    • To report the performance of the J-KAREN-P laser system.
    • To demonstrate the capability for generating ultra-high intensities for novel research.

    Main Methods:

    • Utilizing an Optical Parametric Chirped Pulse Amplification (OPCPA) and Ti:sapphire hybrid architecture.
    • Employing pulse compression techniques to achieve femtosecond durations.
    • Focusing laser pulses using an f/1.3 off-axis parabolic mirror.

    Main Results:

    • Generation of 63 J broadband pulse energy at 0.1 Hz.
    • Achieved peak power exceeding 1 PW with 30 fs pulse duration.
    • Demonstrated temporal contrast of 10^12 and on-target intensities exceeding 10^22 W/cm^2.

    Conclusions:

    • The J-KAREN-P laser system provides a unique platform for pioneering research.
    • The achieved parameters open new avenues in the study of laser-matter interactions at extreme intensities.