研究目的
Investigating the stabilization of a diode laser to 1 Hz-level Allan deviation using atomic spectroscopy for Rb four-level active optical frequency standard.
研究成果
The compact ultra-stable 420 nm diode laser system achieves a fractional frequency Allan deviation of 1.4 × 10?15∕√?? and a signal-to-noise ratio of 3,000,000, demonstrating superior performance among compact ultra-stable lasers without PDH systems. The laser serves as an effective pumping source for the Rb four-level active optical frequency standard, with potential applications as an absolute wavelength standard.
研究不足
The system's long-term frequency stability is not fully evaluated due to the absence of a second identical system for comparison. The locking bandwidth could be further improved to eliminate residual frequency noise bumps.
1：Experimental Design and Method Selection:
The experiment involves stabilizing a 420 nm blue diode laser on the hyperfine transition line of Rb atom using modulation transfer spectroscopy (MTS) method. The setup includes an interference filter external cavity diode laser (ECDL), an isolator, laser beam expander, half-waveplate, polarization beam splitter, electron-optic modulator, and photodetectors. The error signal from the MTS method is used to control the laser frequency via feedback to PZT and current ports.
2：Sample Selection and Data Sources:
A natural Rb vapor cell containing 85Rb and 87Rb isotopes is used. The cell temperature is precisely controlled.
3：List of Experimental Equipment and Materials:
Equipment includes a 420 nm ECDL, isolator, beam expander, HWP, PBS, EOM, PD, PID controller, low-pass filter, and temperature controller. Materials include the Rb vapor cell.
4：Experimental Procedures and Operational Workflow:
The laser is divided into pump and probe beams. The pump beam is phase modulated and interacts with Rb atoms. The probe beam is detected to generate an error signal, which is fed back to control the laser frequency.
5：Data Analysis Methods:
The frequency noise power spectral density and Allan deviation of the residual error signal are analyzed to evaluate the laser's stability.
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