Method for measuring wavelength of light

Many measuring tools can be used for optical measurement, such as: optical element analyzer, polarization analyzer, polarization controller, high-power optical attenuator, spectrum analyzer, digital communication analyzer, pulse code generator, parallel bit error rate tester, optical receiver enhancement tester, etc.

At present, the accurate measurement of optical wavelength is mainly achieved by comparing the high-resolution interferometer with the established wavelength standard. Michelson interferometer and Fabry-Perot interferometer are commonly used. Ry-Perot) interferometer, etc.

When measuring wavelength with interferometer, under the same optical path difference, the laser wavelength is inversely proportional to its interference order change rate (such as Michelson interferometer) or interference order (such as Fabry-Perot interferometer), so the wavelength ratio can be obtained by determining the interference order or interference order change.

Extended data

Polarizers can be used to detect fluorescence intensity, time-resolved fluorescence, fluorescence polarization, absorption light and chemiluminescence.

In optics, Fabry-Pérot interferometer is a multi-beam interferometer composed of two parallel glass plates, in which the opposite inner surfaces of the two glass plates have high reflectivity.

Fabry-Perot interferometer is also often called Fabry-Perot resonator. When two glass plates are separated and fixed by a hollow spacer with a fixed length, it is also called Fabry-Perot etalon or simply referred to as etalon (from French étalon, meaning "measurement specification" or "standard"), but these terms are not strictly distinguished when used.

Baidu Encyclopedia-Optical Wavelength Standard

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Baidu encyclopedia-polarimeter

Baidu encyclopedia-Fabry-Perot interferometer