Related Experiment Video
Updated: Jan 30, 2026
08:02
Generation of Local CA1 γ Oscillations by Tetanic Stimulation
Published on: August 14, 2015
9.5K
Coherent detection with an incoherent local oscillator.
Optics Express
|January 18, 2019
Summary
This study shows how to fully reconstruct optical fields using a simple incoherent source. This method simplifies optical field analysis, especially where high-quality lasers are unavailable.
Area of Science:
- Optics and Photonics
- Signal Processing
Background:
- Reconstructing complex optical fields typically requires coherent light sources.
- The availability of high-quality lasers is limited in certain spectral regions.
Purpose of the Study:
- To demonstrate a method for fully coherent reconstruction of arbitrary optical fields.
- To utilize an incoherent source as a local oscillator (LO) for this reconstruction.
Main Methods:
- A novel signal processing procedure is employed for reconstruction.
- The system requires receiver electrical bandwidth and sampling rate to be at least twice the signal and LO bandwidth.
Main Results:
- Successful demonstration of fully coherent reconstruction of optical field complex envelopes.
- The method is feasible even with an incoherent local oscillator.
Conclusions:
- The proposed scheme offers a practical solution for optical field reconstruction.
- This technique is especially valuable in spectral regions lacking high-quality lasers, broadening the applicability of optical field analysis.
More Related Videos
09:35Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
Published on: March 10, 2017
9.7K
10:22Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
Published on: December 6, 2016
21.1K
Related Concept Videos
01:30Oscillations In An LC Circuit
3.1K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
3.1K
01:06Forced Oscillations
8.0K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
8.0K
01:07Damped Oscillations
7.2K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
7.2K
01:04Oscillations about an Equilibrium Position
6.9K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
6.9K
01:19Limits with Oscillating Discontinuities
460
An oscillating discontinuity is a type of discontinuity in which a function’s values fluctuate infinitely often as the input approaches a particular point. Unlike jump discontinuities, where the function suddenly shifts between two values, or infinite discontinuities, where the function diverges without bound, an oscillating discontinuity arises from rapid back-and-forth variation. Because the function never stabilizes toward a single value, no finite limit exists at that point.One of the...
460
01:30RLC Circuit as a Damped Oscillator
2.2K
An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
2.2K