研究目的
To develop a 698 nm ultra-stable clock laser system for dedicated use in a space strontium optical clock.
研究成果
The developed 698 nm ultra-stable clock laser system achieves a frequency instability of 3.5×10?15 at 1 s averaging time and a linewidth of about 1.3 Hz, demonstrating its potential for use in space strontium optical clocks. Future work may focus on further optimization and testing under space conditions.
研究不足
The system's performance is preliminary tested against another laser system, indicating potential areas for further optimization and validation in space conditions.
1：Experimental Design and Method Selection:
The laser system is frequency-stabilized to an ultrahigh finesse optical resonant cavity with Pound-Drever-Hall (PDH) method.
2：Sample Selection and Data Sources:
The system is compared with another laser beat frequency locked in a 10 cm optical reference cavity for performance testing.
3：List of Experimental Equipment and Materials:
Includes an external cavity diode laser (ECDL), ultra-low expansion (ULE) glass spacer, fused silica (FS) mirrors with ULE rings, and a vacuum chamber with thermal shielding.
4：Experimental Procedures and Operational Workflow:
The ECDL is designed for compactness and robustness, emitting 35 mW laser power at 698 nm. The optical cavity is designed to minimize temperature and vibration sensitivity, supported by a structure optimized through finite element analysis (FEA).
5：Data Analysis Methods:
The laser's frequency instability and linewidth are measured and analyzed.
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