研究目的
Investigating the precision locking of a 1064 nm continuous wave (CW) laser to an ultrastable optical frequency comb using the feed-forward method to transfer the stability and coherent properties of the ultrastable laser to the CW laser.
研究成果
The feed-forward method successfully locked a 1064 nm CW laser to an ultrastable optical frequency comb, transferring the stability and coherent properties of the ultrastable laser to the CW laser. The relative linewidth of the stabilized CW 1064 nm laser was narrowed to 1.14 mHz, and the Allan deviation was 1.5 × 10?17 in 1 s. The integrated phase noises in the range of high frequencies (1 Hz–10 MHz) and low frequencies (1 mHz–10 Hz) reached 381 mrad and 20.5 mrad, respectively. This demonstrates the robustness and reliability of the feed-forward scheme for applications in low frequency gravitational wave detection and high precision optical frequency synthesis.
研究不足
The locking bandwidth of the whole system is limited by the properties of the actuator, the noise introduced by a complex circuit, and the pump-gain process. The actual bandwidth of the whole feed-forward system was approximately 280 kHz, dependent on the rising time of acoustic wave transmission in the AOFS.
1：Experimental Design and Method Selection:
The feed-forward method was used to lock a 1064 nm CW laser to a Yb:fiber optical frequency comb stabilized to an ultrastable 972 nm CW laser. An acousto-optic frequency shifter (AOFS) was employed for real-time frequency shift without the need for a phase-locked loop (PLL) electronics.
2：Sample Selection and Data Sources:
The 1064 nm CW laser was a diode-pumped monolithic Nd:YAG laser, and the optical frequency comb was based on a 250 MHz, 20 mW, 1030 nm Yb-doped fiber comb.
3：List of Experimental Equipment and Materials:
AOFS at a center modulation frequency of 80 MHz, photodiode (PD), RF synthesizer (LO), bandpass filter (BPF), phase locked loop (PLL), electrical spectrum analyzer (ESA), fast Fourier transform (FFT) analyzer (SRS, SR770), frequency counter.
4：Experimental Procedures and Operational Workflow:
The 1064 nm laser beam was divided into a transmitted beam and a first-order diffracted beam with the AOFS. The beat signals between the comb and these two beams were recorded by in-loop and out-of-loop configurations. The out-of-loop beat signal was used to assess the phase noise characterization of the stabilized CW 1064 nm laser.
5：Data Analysis Methods:
The frequency spectrum and relative linewidth of the beat note signals were analyzed. The phase noise power spectral density (PSD) and the integrated phase noise (IPN) of the locked out-of-loop beat note were observed.
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