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提出了一种基于相位差偏置萨尼亚克环的新型外腔半导体激光(ECDL)无调制稳频方法,采用偏振分束器(PBS)作为萨尼亚克环的输入及输出端,并利用1/4波片在环内沿相反方向传播的偏振方向互相垂直的两束光之间引入π/2的相位差(△δ),萨尼亚克环的输出光经过起偏器可以分解得到由Rb的饱和吸收峰引起的色散相移,通过这种方法可以得到适合稳频的误差信号。相比现有的利用全内反射引入相位差(sin△δ=0.64)的方法,色散信号放大系数sin△δ的值可达到理论最大值,有效地提高了误差信号的强度,这种方法简单、稳健,且在原子物理实验等方面具有潜在应用。
A new modulation mode-free method for ECDL based on the phase difference biasing Sagnac loop is proposed. Polarization beam splitter (PBS) is used as the input and output of the Sagnac loop. The phase difference (Δδ) of π / 2 is introduced between two beams perpendicular to each other in the polarization directions propagating in the ring in the ¼ wave plate, and the output light of the Sagnick ring is decomposed by the polarizer The phase shift of the dispersion caused by the saturation absorption peak of Rb is obtained, and the error signal suitable for frequency stabilization can be obtained by this method. Compared with the existing method using total internal reflection to introduce phase difference (sin △ δ = 0.64), the value of amplification coefficient sin △ δ of chromatic dispersion signal can reach the theoretical maximum, which effectively increases the intensity of the error signal. This method is simple , Robust, and has potential applications in atomic physics experiments.