Pump Probe Laser
Pump Probe Laser - Related Videos
09:49
An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Cited by 13 •
2018
This protocol describes the key steps for performing and analyzing pump-probe experiments combining a femtosecond optical laser with a free-electron laser in order to study ultrafast photochemical reactions in gas-phase molecules.
06:31
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Probe-based confocal laser endomicroscopy enables real-time microscopy of the human urinary tract during cystoscopy, providing dynamic, intravital imaging of pathological states such as bladder cancer with cellular resolution. Endomicroscopy may augment the diagnostic accuracy of standard white light endoscopy and provide intraoperative image guidance to improve surgical resection.
02:22
Positioning Laser Doppler Probe: A Technique to Implant Probe Over Middle Cerebral Artery for Blood Flow Measurement in Murine Model
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This video describes the surgical procedure to immobilize the laser Doppler probe over the murine brain's middle cerebral artery, or MCA. The probe helps to measure the blood flow in the brain's microvasculature by measuring the Doppler shift caused due to the motion of red blood cells within the artery.
09:24
Optical Screening of Novel Bacteria-specific Probes on Ex Vivo Human Lung Tissue by Confocal Laser Endomicroscopy
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Cited by 10 •
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This technique describes an efficient screening process for evaluating bacteria-specific optical imaging agents within ex vivo human lung tissue, by fibered confocal fluorescence microscopy for the rapid identification of small molecule chemical probe-candidates with translatable potential.
08:41
A Rapid Laser Probing Method Facilitates the Non-invasive and Contact-free Determination of Leaf Thermal Properties
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Cited by 2 •
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A method was developed to determine the specific heat capacity and thermal conductivity of leaf tissue by non-invasive, contact-free near infrared laser probing, which requires less than 1 min per sample.
FAQs
The delay determines when the probe samples the material after the pump has created a nonequilibrium state. Recording the response at many delays reveals how quickly the system changes and relaxes, rather than producing only a single snapshot. This time-dependent sequence can expose dynamics ranging from ultrafast behavior to processes occurring over longer timescales.
Time-dependent changes in transmission, reflection, absorption, or emission can indicate different relaxation processes within the excited material. In engineering studies, the resulting signals can provide evidence about charge transport, carrier recombination, energy transfer, and thermal behavior. Comparing how these signals evolve with delay helps relate optical measurements to the underlying material or device dynamics.
The measured optical response changes as the excited system returns toward its relaxed condition. The rate and form of that change provide information about processes that influence operation, including carrier motion, recombination, energy redistribution, and thermal effects. Engineers can use these time-dependent characteristics to assess materials and understand factors that may limit or improve optoelectronic device performance.
A typical sequence begins by directing the pump pulse at the sample to create the excited state. A probe pulse then interrogates the sample after a selected delay, and the experiment records a change in transmission, reflection, absorption, or emission. Repeating the measurement while varying the delay produces a time-resolved dataset for reconstructing the material response.
These observables describe how the sample's optical behavior changes after excitation. Their evolution over the pump-probe delay provides time-dependent evidence of relaxation and energy-transfer behavior, while the selected observable can emphasize different aspects of the response. Together, the measurements support characterization of charge-related, thermal, and other dynamic processes in engineered materials and optical components.
Engineering applications include semiconductors, photonic devices, nanomaterials, and optical components. Measurements can characterize charge transport and carrier recombination in semiconductor or optoelectronic systems, while energy-transfer and thermal responses help evaluate nanomaterials and components. The resulting data support material characterization, device optimization, and the development of faster optoelectronic and energy technologies.