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Optical heterodyne detection is a method of extracting information encoded as modulation of the phase, frequency or both of electromagnetic radiation in the wavelength band of visible or infrared light. The light signal is compared with standard or reference light from a "local oscillator" (LO) that would have a fixed offset in frequency and phase from the signal if the latter carried null information. "Heterodyne" signifies more than one frequency, in contrast to the single frequency employed in homodyne detection.
A laser beat frequency high resolution wavelength demodulation device
ActiveCN116295546Bhigh resolutionimprove long-term stabilityConverting sensor output opticallyWavelengthMechanical engineering
The application belongs to the technical field of optical sensing, and particularly relates to a high-resolution wavelength demodulation device based on laser beat frequency technology, the main structure of which comprises a reference light path and a sensing light path connected with a measuring light path respectively; the measuring light path, the reference light path and the sensing light path are connected with the measuring light path respectively, a gas molecule absorption line is introduced as a reference frequency, laser frequency measurement is reduced from a terahertz wave band to a low-frequency wave band which is easy to measure through an optical heterodyne detection scheme, high-resolution measurement is carried out through an oscilloscope and a frequency meter, and the device has extremely high resolution and long-term stability; the device has the advantages of simple structure, high resolution, good stability, fast response speed, high signal-to-noise ratio and the like, and is suitable for demodulating high-precision optical resonant cavity sensors.
Owner:SHANDONG UNIV +1