Apparatus for measuring fluorescence lifetime

Abstract

Provided herein is an apparatus for measuring fluorescence lifetime that can easily and accurately measure a fluorescence lifetime without destroying an object to be measured. The fluorescence lifetime measurement apparatus comprises a plurality of pump beam sources, a pump beam combiner, a first multimode optical fiber, a second multimode optical fiber and a third multimode optical fiber, an optical isolator, a wavelength selective reflective filter, a cutoff filter, and a photodiode.

Description

technical field [0001] Various embodiments of the present disclosure relate to devices for measuring fluorescence lifetime. Background technique [0002] A high-power output solid-state laser uses a single crystal doped with a small amount of rare earth ions and manufactured in a rod or disk shape as a laser oscillation medium. Here, the doping concentration and fluorescence lifetime of the rare earth ions in the laser oscillation medium are core material properties of the medium that determine the oscillation characteristics of the laser. [0003] Typically, fluorescence lifetime is determined by measuring the decay kinetics of fluorescence intensity by time-resolved fluorescence spectroscopy. However, conventional fluorescence lifetime measurement uses a monochromator for selecting a certain wavelength of fluorescence, so there are limitations in integrating and minimizing the measurement equipment. [0004] Methods for analyzing the doping concentration include a method...

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Problems solved by technology

Therefore, ICP-MS cannot measure the doping concentration of solid samples in the shape of rods or disks, and cannot measure the spatial distribution of doping concentration

[0006] Moreover, although optical absorption spectroscopy is capable of measuring the concentration of a solid sample in the shape of a disk, in order to minimize the scattering and diffuse reflection (diffuse reflectance) of light entering the sample, both surfaces of the disk must be processed to have an Surfaces of optical quality less than λ / 5, and the concentration of rod-shaped solid samples cannot be measured by optical absorption spectroscopy

Also, since the spectrophotometer can perform accurate measurement only when the optical density (OD) is equal to or less than 4, the measurable disc thickness is limited (generally, a disc having a thickness equal to or less than about 5 mm is used, But it changes according to the type of rare earth ion and doping concentration)

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