Anti-stokes Raman
Anti-stokes Raman - Related Videos
03:00
Coherent Anti-Stokes Raman Spectroscopy to Visualize Myelinated Neurons in Mouse Brain Tissue
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2025
Source: McCullagh, E. A., et al. Coherent Anti-Stokes Raman Spectroscopy (CARS) Application for Imaging Myelination in Brain Slices. J. Vis. Exp. (2022)The video demonstrates fluorescence and Coherent Anti-Stokes Raman Spectroscopy (CARS) imaging to visualize neuronal architecture in rodent brain tissue. Nissl staining labels cell bodies by binding to ribosomal RNA, while CARS imaging targets lipid-rich myelin through laser-induced signals. Overlaying the fluorescence and CARS images provides a...
12:56
Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)
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Cited by 2 •
2010
A combination of three single wavelength short-pulsed lasers is used to generate coherent anti-Stokes Raman scattering (CARS) and doubly-resonant CARS (DR-CARS). The difference between these signals provides enhanced sensitivity for otherwise difficult to detect coherent Raman signals, enabling imaging of weak Raman scatterers.
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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Cited by 2 •
2016
Efficient generation of nonlinear phenomena related to third order optical non-linear susceptibility Χ(3) interactions in triply resonant silica microspheres is presented in this paper. The interactions here reported are: Stimulated Raman Scattering (SRS), and four wave mixing processes comprising Stimulated Anti-stokes Raman Scattering (SARS).
09:46
Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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Cited by 7 •
2022
This paper directly compares the resolution, sensitivity, and imaging contrasts of stimulated Raman scattering (SRS) and coherent anti-Stokes Raman scattering (CARS) integrated into the same microscope platform. The results show that CARS has a better spatial resolution, SRS gives better contrasts and spectral resolution, and both methods have similar sensitivity.
04:08
Coherent Anti-Stokes Raman Spectroscopy (CARS) Application for Imaging Myelination in Brain Slices
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Cited by 8 •
2022
Visualizing myelination is an important goal for many researchers studying the nervous system. CARS is a technique that is compatible with immunofluorescence that can natively image lipids within tissue such as the brain illuminating specialized structures such as myelin.
FAQs
The key variable is the population of molecules in excited vibrational levels. When that population is larger, more scattering events can transfer vibrational energy to the emitted photon, increasing anti-Stokes intensity. Because temperature changes this population, the signal provides a route to evaluate thermal conditions rather than only identify molecular vibrations.
Anti-Stokes and Stokes measurements probe related vibrational information from opposite energy-transfer directions. Comparing them can strengthen molecular identification and vibrational analysis, while anti-Stokes intensity adds sensitivity to vibrational-state population and therefore temperature. This complementary relationship helps separate spectral interpretation from thermal information in chemical measurements.
The emitted photon has higher energy and a shorter wavelength because it receives vibrational energy from a molecule that was already in an excited vibrational level. This energy relationship distinguishes anti-Stokes scattering from processes that leave the photon with less energy, allowing the spectrum to report on molecular vibrational states.
Temperature can be evaluated through the intensity of the anti-Stokes signal because heating increases the population of excited vibrational levels. A measurement therefore connects optical scattering intensity with the thermal condition of the chemical system. This provides a noncontact approach to thermometry, avoiding the need to place a temperature sensor directly in the sample.
Researchers can select anti-Stokes Raman when they need both vibrational information and insight into temperature in a chemical sample. The method supports molecular identification, vibrational analysis, and noncontact thermometry. It is particularly useful when monitoring thermal conditions alongside chemical characteristics rather than treating composition and temperature as completely separate measurements.
Spatially resolved measurements can show how temperature or chemical conditions vary across different locations in a sample. Instead of producing only a single overall signal, they support maps of thermal or chemical changes. In chemistry, these maps help connect local vibrational behavior with localized temperature differences or evolving chemical features.