研究目的
To develop a transportable 1555-nm ultra-stable laser with sub-0.185-Hz linewidth for applications in accurate modern measurements such as optical atomic clocks, gravitational wave detection, and ultra-low phase noise microwave generation.
研究成果
The cavity-stabilized ultra-stable laser at 1555 nm achieves a frequency instability of 7 × 10?16 from 1 to 10 s and a linewidth of about 0.185 Hz, making it suitable for ultra-low phase noise microwave generation as a local oscillator in cesium fountain clocks.
研究不足
The frequency instability rises to 1 × 10?15 at 100 s, attributed to temperature fluctuations due to the systems being located in different labs without active thermal control.
1：Experimental Design and Method Selection:
The study employs the Pound–Drever–Hall (PDH) technique for laser frequency stabilization. Two independent systems with the same configuration are constructed for performance evaluations.
2：Sample Selection and Data Sources:
A commercial fiber laser at 1555 nm is locked to a reference cavity with a finesse measured by the cavity ring down method.
3：List of Experimental Equipment and Materials:
Includes a 100 mm-long ultra-low expansion glass cavity, acousto-optic modulator (AOM), electro-optic modulator (EOM), and avalanche photodetector (APD).
4：Experimental Procedures and Operational Workflow:
The laser passes through an AOM for broadband frequency control, is modulated by an EOM, and the reflected light is directed to an APD for error signal generation.
5：Data Analysis Methods:
The beatnote between the two lasers is analyzed using a fast Fourier transform (FFT) analyzer to evaluate performance.
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