Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
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...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
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,...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Atypical presentation of angiosarcoma detected by <sup>18</sup>F-FDG PET/CT as a solitary mediastinal lesion.

Revista espanola de medicina nuclear e imagen molecular·2026
Same author

EFFECTIVENESS IN INDIRECT DECOMPRESSION USING MINIMALLY INVASIVE SURGERY - TRANSFORAMINAL LUMBAR INTERBODY FUSION IN SINGLE-LEVEL LUMBOSACRAL SPONDYLOLISTHESIS.

Georgian medical news·2024
Same author

Radiomics nomogram: distinguishing benign and malignant pure ground-glass nodules based on dual-layer spectral detector CT.

Clinical radiology·2024
Same author

[Clinical observation of the subthreshold micropulse laser combined with ranibizumab for treatment of diabetic macular edema].

[Zhonghua yan ke za zhi] Chinese journal of ophthalmology·2024
Same author

[Challenges and strategies in the treatment of neovascular age-related macular degeneration].

[Zhonghua yan ke za zhi] Chinese journal of ophthalmology·2024
Same author

Measurement accuracy in silicon photonic ring resonator thermometers: identifying and mitigating intrinsic impairments.

Optics express·2024

Related Experiment Video

Updated: Jun 19, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Coherent phase and frequency detection by using sum-frequency mixing in nonlinear waveguides.

S Janz, E Frlan, H Dai

    Optics Letters
    |October 3, 2009
    PubMed
    Summary

    We developed a new optical phase detector using nonlinear waveguides. This device precisely measures the relative phase of light beams, achieving sub-0.2 radian resolution for advanced optical measurements.

    More Related Videos

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

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

    Published on: January 28, 2019

    Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
    15:58

    Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

    Published on: December 3, 2013

    Related Experiment Videos

    Last Updated: Jun 19, 2026

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

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

    Published on: January 28, 2019

    Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
    15:58

    Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

    Published on: December 3, 2013

    Area of Science:

    • Nonlinear Optics
    • Integrated Photonics
    • Quantum Optics

    Background:

    • Optical phase measurement is crucial for various applications, including interferometry and optical communications.
    • Existing methods for phase detection can be complex or lack the required resolution.
    • Nonlinear optical phenomena offer potential for novel sensing and measurement techniques.

    Purpose of the Study:

    • To demonstrate a novel optical phase detector utilizing sum-frequency mixing in a nonlinear waveguide.
    • To measure the relative phase of two input light beams by analyzing the sum-frequency light's near-field pattern.
    • To assess the detector's resolution and its application in an interferometer for frequency monitoring.

    Main Methods:

    • Fabrication of an Aluminum(x)Gallium(1-x)Arsenide (AlGaAs) nonlinear waveguide optimized for sum-frequency generation.
    • Utilizing 1.06 micrometer input light for sum-frequency mixing.
    • Monitoring the near-field radiation pattern of the generated sum-frequency light.
    • Integrating the phase detector into an interferometer setup.

    Main Results:

    • Demonstration of a simple optical phase detector with high resolution.
    • Achieved phase shift resolution of less than 0.2 radians.
    • Successful application of the detector as a gigahertz-resolution frequency monitor in an interferometer.

    Conclusions:

    • The developed AlGaAs waveguide-based phase detector offers a novel and efficient method for optical phase measurement.
    • The device provides high resolution, suitable for sensitive applications.
    • Its integration into an interferometer highlights its potential for advanced frequency monitoring.