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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

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Related Experiment Video

Updated: May 7, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Optical Hash function based on two-beam interference.

Hongji Lai, Wenqi He, Xiang Peng

    Applied Optics
    |October 3, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an optical Hash function using two-beam interference to create a unique digital fingerprint for any message. The method ensures one-way processing and data compression for secure information handling.

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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

    Published on: January 28, 2019

    Area of Science:

    • Optics
    • Cryptography
    • Information Security

    Background:

    • Traditional cryptographic methods face challenges with increasing data volumes and security threats.
    • The need for efficient and secure digital fingerprinting techniques is paramount in modern data management.

    Purpose of the Study:

    • To propose a novel optical Hash function based on two-beam interference (OHF-TBI).
    • To develop a method for generating a unique digital fingerprint for messages of arbitrary length.
    • To ensure the one-way property and compressibility of the proposed Hash function.

    Main Methods:

    • A three-step approach is employed, featuring a core one-way processing procedure.
    • A cascaded process combining two-beam interference and phase-truncation is designed.
    • Theoretical analysis and numerical simulations are used for performance verification.

    Main Results:

    • The proposed OHF-TBI successfully generates a digital fingerprint for arbitrary length messages.
    • The method demonstrates the desired one-way property and compressibility.
    • Numerical simulations validate the theoretical performance of the optical Hash function.

    Conclusions:

    • The developed optical Hash function based on two-beam interference offers a viable solution for secure digital fingerprinting.
    • The combination of interference principles and phase truncation effectively achieves one-way processing and compression.
    • This approach holds potential for enhanced information security applications.