Laser-induced fluorescence

Laser-induced fluorescence ( engl. laser- induced fluorescence, LIF) is a spectroscopic measurement method. It is based on fluorescence excitation by a laser and thus belongs to the group of laser spectroscopies.

Description

Is an atom, molecule or material, excited by a laser beam having a wavelength corresponding to its absorption area, as a result of the laser excitation fluorescence. The intensity of fluorescence is directly related to the first laser power. By increasing the laser intensity, it may come to saturation effects or even ( reversible or irreversible ) damage of the excited material. A non-radiative de-excitation of the material is called quenching.

LIF in the art methods are, inter alia, for determining the concentrations of substances used in gases and liquids. In particular in the combustion technique is the laser-induced fluorescence for the detection of the OH molecule ( OH concentration ).

In physics, time-resolved LIF techniques are used for example to determine the lifetimes of excited atomic or molecular states.

• A spectroscopic method
• Laser application