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将频率调制加在声光调制器上 ,用三次谐波探测法获得了铯原子D2 线的三阶微分饱和光谱。采用这种激光器无调制扰动方案结合三次谐波锁频技术 ,实现了 85 2nm的分布布拉格反射器半导体激光器相对于 6S1/2 F =4- 6P3 /2 F′ =5超精细跃线的频率锁定。由锁定后的频率误差信号估算 ,10s内激光频率起伏小于± 35 0kHz ,相对频率稳定度约 1× 10 -9。这种无调制扰动方案可以消除一般的饱和吸收稳频方法中由于直接对激光器进行频率调制而带来的额外频率噪声 ;三次谐波锁频技术的应用 ,还可有效地降低铯原子饱和吸收谱中剩余多普勒背景的影响
The frequency modulation was added to the acousto-optic modulator, and the third harmonic detection method was used to obtain the third-order differential saturation spectrum of the cesium atom D2 line. Using this laser modulation-free dithering scheme combined with the third harmonic frequency-locking technique, the frequency locking of a distributed Bragg reflector semiconductor laser at 85 2 nm relative to a 6S1 / 2 F = 4- 6P3 / 2 F ’= 5 hyperfine jitter is achieved . From the locked frequency error signal, the laser frequency fluctuation within 10s is less than ± 35 0kHz and the relative frequency stability is about 1 × 10 -9. The unmodulated perturbation scheme can eliminate the extra frequency noise caused by the direct frequency modulation of the laser in the conventional saturation absorption frequency stabilization method. The application of the third harmonic frequency locking technique can also effectively reduce the saturation absorption spectrum of cesium atoms In the remaining Doppler background