CPT chip atomic clock based on topological posture surface emitting laser and implementation method thereof

Abstract

The invention relates to a CPT chip atomic clock based on a topological posture surface emitting laser and an implementation method thereof. The CPT chip atomic clock comprises an optical system and a circuit system. The optical system comprises a topological posture PCSEL, a focusing lens, a collimating lens, a quarter-wave plate, an atomic gas chamber and a photoelectric detector; the circuit system comprises a light current amplifier, a filter module, a direct current modulation and demodulation module, a direct current signal servo feedback control module, a voltage-controlled voltage source, a microwave modulation and demodulation module, a crystal oscillator, a microwave signal servo feedback control module, a microwave source, a direct current and a microwave coupler. The topological posture PCSEL is used for the CPT chip atomic clock for the first time, and the CPT chip atomic clock which is more immune to external temperature fluctuation, more stable in frequency and more excellent in performance is innovatively realized by using the huge advantages of low temperature drift coefficient, single-mode lasing, low threshold and narrow spectral line width of the topological posture PCSEL.

Description

technical field [0001] The invention belongs to the technical field of coherent population trapping (Coherent Population Trapping, CPT) chip atomic clocks, in particular to a CPT chip atomic clock based on topological body surface emitting lasers and an implementation method thereof. Background technique [0002] Atomic clocks are based on the properties of quantum transitions, which produce a stable and accurate frequency standard. Utilizing the inherent quantum transition frequencies of atoms makes atomic clocks the most accurate time and frequency standards currently available. However, the atomic clocks with excellent performance in the world are generally complicated in system, expensive in cost, and poor in portability, which limits the application range of atomic clocks. In order to break through this limitation, many research institutes at home and abroad have carried out research on miniaturized atomic clocks. Among them, CPT chip atomic clocks are small in size an...

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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned CPT chip atomic clock using traditional VCSEL and DFB lasers as light sources, the CPT chip atomic clock is greatly affected by environmental temperature fluctuations, spectral drift, and poor reliability due to the large temperature coefficient of VCSEL. And in view of the problems of low beam quality and limited output power of DFB lasers, the present invention proposes for the first time a CPT chip atomic clock based on topological body surface emitting lasers and its implementation method, which can improve the performance index and product reliability of the CPT chip atomic clock. It is of great value in improving the original innovation in the field of my country's CPT chip atomic clock, promoting the independent controllability of core devices and key applications

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