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Photonics Dictionary

laser-induced fluorescence

Laser-induced fluorescence (LIF) is a spectroscopic technique that involves using a laser to excite molecules or atoms, leading to their emission of fluorescence light. This technique is widely used in scientific research, analytical chemistry, and various fields for studying the composition and properties of substances.

Key features of laser-induced fluorescence include:

Laser excitation: A high-energy laser beam is used to selectively excite specific molecules or atoms in a sample. The laser light provides the necessary energy to move electrons to higher energy states.

Fluorescence emission: When the excited electrons return to their lower energy states, they emit light in the form of fluorescence. The emitted light is characteristic of the specific molecules or atoms in the sample.

Detection: Fluorescence light is detected using a photodetector, and the resulting signal is analyzed to obtain information about the composition, concentration, or other properties of the sample.

Spectral analysis: The emitted fluorescence light is often analyzed in terms of its spectral characteristics, including the wavelength and intensity of the emitted light. This spectral information can provide insights into the identity of the substances in the sample.

Laser-induced fluorescence finds applications in various fields, including:

Biological and medical research: LIF is used in the study of biological molecules, such as DNA and proteins, as well as for medical diagnostics and imaging.

Environmental monitoring: LIF is employed for detecting and analyzing pollutants in air, water, and soil.

Analytical chemistry: LIF is used in chemical analysis to identify and quantify substances in a sample.

Combustion and aerospace research: LIF is applied in the study of combustion processes and the analysis of gases in aerospace applications.

LIF is utilized in remote sensing applications to study atmospheric composition and monitor environmental changes.

Laser-induced fluorescence offers high sensitivity and selectivity, making it a valuable tool for investigating the properties of substances at the molecular level. The technique is particularly useful in situations where precise and nondestructive analysis is required.

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