Ultrafine energy level interval measurement device and method based on four-level active optical clock

Abstract

The invention discloses a four-energy level active optical clock-based ultra-fine energy level interval measuring device and method. According to the four-energy level active optical clock-based ultra-fine energy level interval measuring device and method, the measurement of the ultra-fine energy level interval of atoms is realized by means of the Doppler effect of thermal atoms and the optical weak feedback mechanism of the resonant cavity of a bad cavity region, and the precision of the measurement of the ultra-fine energy level interval of the atoms can be improved. The device comprises a frequency stabilization unit for a pumping laser source, a four-level active optical clock resonant cavity unit and an ultra-fine energy level interval measurement unit; by means of modulation transfer frequency stabilization and the optical weak feedback of the bad cavity region, the light frequency components of the stimulated radiation output of the atoms of the bad cavity region are directly analyzed; an ultra-fine energy level interval of a to-be-tested energy state is calibrated; the stimulated radiation of a quantum reference system directly outputs clock transition signals, so that a narrower quantum limit line width is realized. The method can be further applied to other alkali metal four-energy level active optical clock systems and can improve the measurement quantity and precision of the ultra-fine energy levels of atoms.

Description

technical field [0001] The invention belongs to the technical field of optical frequency atomic clocks and precision measurement, and relates to atomic ultrafine energy level interval measurement technology, in particular to an ultrafine energy level interval measurement device based on a four-level active optical clock and an implementation method thereof. Background technique [0002] The precise measurement of atomic hyperfine energy level structure can strictly test various theoretical methods for calculating hyperfine energy level structure. By measuring the atomic hyperfine energy level interval, the corresponding hyperfine coupling constant can be precisely calculated. It has important application value in inspection, laser cooling and trapping, high-resolution spectroscopy and precision measurement. Among them, the precise measurement of the hyperfine energy level constant of the alkali metal cesium atom is of great significance in the experimental detection of atomic...

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Problems solved by technology

However, the non-linear effect of the laser frequency sweep and the frequency drift of the optical reference cavity caused by the external temperature change will inevitably affect the measurement accuracy, and the dual resonance spectrum measurement requires two lasers, and the electro-optic modulator is used to control The probe light is frequency modulated, so the frequency accuracy of the signal source driving the electro-optic modulator determines the line width of the spectral line, making it difficult to further improve the measurement accuracy of the hyperfine coupling constant

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