Laser Excitation Wavelength
Laser Excitation Wavelength - Related Videos
01:33
Synergistic Photobiomodulation with a Dual-Wavelength Laser in an In Vitro Disease Model
0 Views •
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...
02:32
The de Broglie Wavelength
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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...
12:00
Synthesis of Gold Nanoparticle Integrated Photo-responsive Liposomes and Measurement of Their Microbubble Cavitation upon Pulse Laser Excitation
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Cited by 2 •
2016
This protocol describes a simple preparation method for gold nanoparticle integrated photo-responsive liposomes with the commercially available materials. It also shows how to measure the microbubble cavitation process of the synthesized liposomes upon the treatment of pulsed laser.
14:18
Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Cited by 2 •
2016
A protocol to detect and automate mode locking in a pre-adjusted nonlinear polarization rotation fiber laser is presented. The detection of a sudden change in the output polarization state when mode locking occurs is used to command the alignment of an intra-cavity polarization controller in order to find mode-locking conditions.
06:40
Laser-guided Neuronal Tracing In Brain Explants
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2015
We describe a technique to label neurons and their processes via anterograde or retrograde tracer injections into brain nuclei using an in vitro preparation. We modified an existing method of in vitro tracer electroporation by taking advantage of fluorescently labeled mouse mutants and basic optical equipment in order to increase labeling accuracy.
FAQs
The best choice usually lies where the target fluorophore absorbs strongly, because efficient photon absorption increases the population of excited molecules and can strengthen the detected signal. Researchers also consider whether the selected laser can distinguish that fluorophore from others, since spectral separation affects how confidently multiple biological labels are measured.
After absorption, the fluorophore reaches an excited electronic state and then releases only part of the absorbed energy as light. The emitted fluorescence therefore appears at a longer wavelength than the excitation light. This separation allows instruments to distinguish illumination from signal, supporting more reliable detection of labeled proteins and cellular structures.
Laser excitation wavelength affects more than signal brightness. An unsuitable choice may reduce fluorescence because the molecule absorbs less efficiently, while excessive or poorly chosen illumination can contribute to photobleaching or cellular damage. Balancing absorption, signal strength, spectral separation, and sample tolerance is therefore important for accurate biological measurements.
Selection begins by relating the available laser color to the fluorophore’s absorption spectrum and expected fluorescence signal. The choice is then evaluated against the need to separate signals from other labels and to limit photobleaching or cellular damage. This selection logic applies across fluorescence microscopy, flow cytometry, and live-cell imaging.
Fluorescence microscopy, flow cytometry, and live-cell imaging all rely on suitable excitation to produce measurable fluorescence. In these settings, wavelength selection supports detection of labeled proteins, visualization of cellular structures, and measurement of biological processes. The practical priority differs with the specimen and measurement, but signal quality and spectral separation remain central.
Poor matching can weaken the fluorescent signal because the molecule does not absorb the laser energy as effectively. Reduced signal can make labeled proteins or cellular structures harder to detect and can lower measurement accuracy. A mismatch may also undermine spectral separation, making it more difficult to distinguish signals when multiple fluorescent labels are present.