Wavelength Control
Wavelength Control - Related Videos
02:32
The de Broglie Wavelength
0 Views •
2020
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
01:33
Synergistic Photobiomodulation with a Dual-Wavelength Laser in an In Vitro Disease Model
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2025
Divide the transwell system into five groups that undergo various treatments.The first group serves as the control and consists of a co-culture of neuroblastoma and microglia cells.In the second group, treat the co-culturer with fibrillar β-amyloid (fAβ) alone. fAβ induces damage in neuroblastoma cells.In the third group, treat neuroblastoma cells with an 808-nanometer laser, then co-culture them with untreated microglia.The laser reduces oxidative stress, improving neuronal survival.In the...
08:41
Single Wavelength Shadow Imaging of Caenorhabditis elegans Locomotion Including Force Estimates
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Cited by 2 •
2014
The technique presented here measures the path of freely swimming microscopic species using single wavelength exposure. C. elegans are used to demonstrate shadow imaging as an inexpensive alternative to costly microscopes. This technique can be adapted to accommodate various orientations, environments and species to measure direction, speed, acceleration and forces.
07:44
Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
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Cited by 5 •
2016
Photostable cyanine dyes are attached to oligonucleotides to monitor hybridization by energy transfer.
01:21
Control System Problem
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2024
In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function. When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
FAQs
Controllable light sources, including lasers and LEDs, generate illumination that can be selected or tuned. Optical filters isolate particular spectral bands, while diffraction gratings separate wavelengths so a desired range can be chosen. Combining these components allows researchers to tailor illumination more precisely than relying on an uncontrolled or broadly emitted light source.
Feedback systems help maintain the chosen wavelength when stable illumination is important. They can be incorporated alongside a controllable source and spectral-selection components to support consistent output over the course of an experiment. This stability is particularly relevant when changes in illumination could affect fluorescence measurements, light-activated materials, or biological responses.
Matching illumination to molecular absorption or excitation properties improves the selectivity of light interaction with biological materials. A suitable spectral band can support fluorescence signals or activate a light-responsive process more effectively, while avoiding unnecessary exposure to other wavelengths. This alignment can improve measurement accuracy and help reduce unwanted photodamage.
A practical workflow begins by identifying the biological target and the relevant absorption or excitation property. Researchers then select a suitable laser or LED, isolate or adjust its output with a filter or diffraction grating, and use stabilization when consistent illumination is required. The controlled light is then applied to the cells, tissue, or engineered system for measurement or manipulation.
Precise wavelength control supports several distinct bioengineering applications. In fluorescence imaging and spectroscopy, it helps provide illumination suited to optical measurements. In optogenetics and phototherapy, it enables more selective interaction with biological systems. Light-activated biomaterials also benefit because their activation can be matched to the relevant spectral response.
In engineered biological systems, spectral precision can influence both what researchers measure and how biological material responds. Selecting an appropriate band may increase measurement accuracy, support more selective manipulation, and reduce unwanted photodamage. These outcomes make wavelength control relevant to studies involving cells, tissues, biomaterials, and other designed biological systems.