研究目的
Investigating the thermal phase fluctuations in optically pumped dual-frequency vertical external-cavity surface-emitting lasers (VECSELs) for application to cesium clocks based on coherent population trapping.
研究成果
The developed fully analytical model for thermal phase fluctuations in optically pumped dual-frequency VECSELs shows very good agreement with experimental phase noise measurements. The model accounts for both pump-induced and thermodynamic fluctuations, providing a more accurate description than the usual low-pass filter model. The findings are crucial for applications in metrology, particularly for cesium clocks based on coherent population trapping.
研究不足
The study focuses on thermal phase fluctuations and their impact on the beatnote phase noise of dual-frequency VECSELs. The model's accuracy is limited by the assumptions made regarding the thermal properties of the semiconductor chip and the simplification of the pump beam's impact.
1：Experimental Design and Method Selection:
The study involves a fully analytical model starting with the resolution of the heat equation inside the semiconductor chip structure and evaluating the induced thermo-optic phase shift. Both fluctuations of the heat induced by the optical pumping and thermodynamic fluctuations at room temperature are considered.
2：Sample Selection and Data Sources:
The study focuses on a dual-frequency VECSEL operating at 852 nm, aimed at cesium CPT clocks application.
3：List of Experimental Equipment and Materials:
The semiconductor chip glued to a Peltier cooler, which is itself bonded to a heat sink, contains a Bragg mirror. A 673 nm multimode-fibered laser diode is used for pumping.
4：Experimental Procedures and Operational Workflow:
The pump beam is incident on the semiconductor chip, creating a thermal load. The thermal response of the structure is investigated, and the power spectral density of the frequency noise is calculated.
5：Data Analysis Methods:
The analysis involves solving the heat equation inside the semiconductor chip structure and evaluating the induced thermo-optic phase shift. The power spectral density of the frequency noise is calculated considering both pump-induced and thermodynamic fluctuations.
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