研究目的
Investigating the development and performance of ultrastable lasers at 1.5μm wavelength for applications in gravity wave detection, fundamental physics tests, optical atomic clock, and coherent transfer of optical frequency.
研究成果
The development of two ultrastable lasers at 1550 nm, locked to cavities with finesse of 483000 and 148000, achieved a linewidth of 0.68 Hz and a fractional frequency instability of 2.7×10-15 at 1s averaging time. Future improvements will address acoustic noise, amplitude turbulence, and temperature fluctuation.
研究不足
The study mentions limitations such as the absence of a soundproof box for the stabilized lasers, which could affect performance due to acoustic noise. Additionally, vibration and temperature fluctuations impact the frequency instability at short and long averaging times, respectively.
1：Experimental Design and Method Selection:
The study employs the Pound-Drever-Hall (PDH) method to lock fiber lasers to ultra-stable optical cavities.
2：Sample Selection and Data Sources:
Two commercial fiber lasers (NKT Koheras E15) are used, locked to two optical reference cavities made of ultra-low expansion glass (ULE).
3：List of Experimental Equipment and Materials:
Includes acousto-optic modulator (AOM), electro-optic modulator (EOM), half-waveplates (HWP), polarizing beam splitter (PBS), lens (L), quarter-wave plate (QWP), photodetector (PD), and double balanced mixer (DBM).
4：Experimental Procedures and Operational Workflow:
Detailed steps involve frequency shifting, polarization adjustment, phase modulation, and laser beam size adjustment to match the cavity mode.
5：Data Analysis Methods:
Phase noise power spectral density (PSD) analysis and frequency instability measurement using a frequency counter.
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