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

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

11.8K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
11.8K
Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

8.6K
Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
8.6K
Non-uniform Circular Motion01:22

Non-uniform Circular Motion

9.2K
In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all circular motion occurs at a constant speed. A particle can travel in a circle and speed up or slow down, showing an acceleration in the direction of motion. In that case, the motion is called non-uniform circular motion, and an additional acceleration is introduced, which is in the direction tangential to the circle. 
For example, such...
9.2K
Galvanometer01:25

Galvanometer

2.7K
Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform...
2.7K
Doppler Effect - II01:05

Doppler Effect - II

4.3K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
4.3K
Coriolis Force01:23

Coriolis Force

5.7K
An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression.
5.7K

You might also read

Related Articles

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

Sort by
Same author

CO<sub>2</sub> Sensing Using Symmetrical Three-Wavelength Precompensated Current-Modulated Tunable Diode Laser Absorption Spectroscopy.

Sensors (Basel, Switzerland)·2026
Same author

Benchmarking Precompensated Current-Modulated Diode-Laser-Based Differential Absorption Lidar for CO<sub>2</sub> Gas Concentration Measurements at kHz Rate.

Sensors (Basel, Switzerland)·2025
Same author

Transverse optical gradient force in untethered rotating metaspinners.

Light, science & applications·2025
Same author

Confocal LiDAR for remote high-resolution imaging of auto-fluorescence in aquatic media.

Scientific reports·2023
Same author

CW coherent detection lidar for micro-Doppler sensing and raster-scan imaging of drones.

Optics express·2023
Same author

Light-driven transport of microparticles with phase-gradient metasurfaces.

Optics letters·2022
Same journal

Gaussian-modulated continuous-variable quantum key distribution over 60 km fiber using an integrated silicon photonic receiver.

Optics letters·2026
Same journal

E2E-OCT: end-to-end joint learning model using optical coherence tomography images for vocal cord leukoplakia diagnosis.

Optics letters·2026
Same journal

Holographic generation of panoramic 3D scenes by concave ellipsoidal mirror reflection.

Optics letters·2026
Same journal

Dual-pilot phase recovery with pair-wise maximum-ratio combining for coherent PONs.

Optics letters·2026
Same journal

Mapping the whispering gallery modes of a CaF<sub>2</sub> disk resonator with half-tapered fibers to estimate the fundamental mode volume.

Optics letters·2026
Same journal

Quantitative estimation of deep-subwavelength scale via dark-field scattering axial energy concentration decay profiles.

Optics letters·2026
See all related articles

Related Experiment Video

Updated: Dec 26, 2025

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
12:22

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

Published on: August 4, 2018

8.8K

Nonlinear optical vortex coronagraph.

Einstom Engay, Peter John Rodrigo

    Optics Letters
    |March 13, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A novel nonlinear optical vortex coronagraph (n-OVC) uses sum-frequency generation for high-contrast imaging. This tunable device achieves a contrast of 10^-4, enabling exoplanet detection with a vortex mask.

    More Related Videos

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
    08:01

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

    Published on: November 21, 2019

    7.5K
    Bringing the Visible Universe into Focus with Robo-AO
    10:35

    Bringing the Visible Universe into Focus with Robo-AO

    Published on: February 12, 2013

    19.9K

    Related Experiment Videos

    Last Updated: Dec 26, 2025

    Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
    12:22

    Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

    Published on: August 4, 2018

    8.8K
    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
    08:01

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

    Published on: November 21, 2019

    7.5K
    Bringing the Visible Universe into Focus with Robo-AO
    10:35

    Bringing the Visible Universe into Focus with Robo-AO

    Published on: February 12, 2013

    19.9K

    Area of Science:

    • Nonlinear optics
    • Coronagraphy
    • Quantum optics

    Background:

    • Direct imaging of exoplanets requires advanced coronagraphy to suppress starlight.
    • Nonlinear optical processes offer novel avenues for coronagraph development.

    Purpose of the Study:

    • To demonstrate a tunable nonlinear optical vortex coronagraph (n-OVC) using sum-frequency generation (SFG).
    • To achieve high contrast for potential exoplanet detection.

    Main Methods:

    • Utilized a periodically poled lithium niobate (PPLN) crystal for SFG.
    • Employed a pump beam with a helical phase profile (topological charge l=2) from a vector vortex mask.
    • Mixed the pump beam with an on-axis point source at 1.6 µm.

    Main Results:

    • Generated a coronagraphic image at the SFG wavelength (~630 nm) due to quasi-phase matching and OAM conservation.
    • Demonstrated tunability to the signal wavelength (1.6 µm) using a pump-wavelength vortex mask.
    • Achieved an inner working angle of ~λs/D and experimental contrast of 10^-4 at 3λs/D.

    Conclusions:

    • The n-OVC is a tunable and achromatic coronagraphic technique.
    • The demonstrated performance shows promise for direct exoplanet imaging applications.