连续可调谐的紫外激光一般通过红外或可见激光进行外腔倍频获得,然而倍频腔锁定电路的带宽限制了激光器的调谐性能。将前馈控制方法用于中性汞原子激光冷却的四倍频紫外激光器,即在调谐基频激光频率的同时,同步调节级联的两个倍频腔。这不仅降低了激光器频率调谐中引入的功率噪声,还提高了紫外激光器的频率调谐范围,使得紫外激光器的调谐能力得到大幅提高。通过汞原子的亚多普勒磁致双色光谱进行激光频率锁定,发现前馈控制电路的应用能降低激光的频率噪声。在汞原子光谱和激光冷却实验中,紫外激光的可调谐性和稳定性的提高将会带来很多优势。 The continuously tunable UV laser is usually obtained by doubling the external cavity with an infrared or visible laser, however, the bandwidth of the doubler cavity locking circuit limits the tuning performance of the laser. The feedforward control method is applied to the fourth harmonic frequency UV laser with neutral mercury atom laser cooling, that is, the two frequency multiplier cavities of the cascade are synchronously adjusted while the fundamental frequency laser frequency is tuned. This not only reduces the power noise introduced in the laser frequency tuning, but also improves the frequency tuning range of the UV laser, which greatly improves the tunability of the UV laser. Laser frequency locking of the magnetophoretic two-color spectrum of mercury atoms by using a mercury atom has found that the use of a feedforward control circuit can reduce the frequency noise of the laser. In mercury atomic spectroscopy and laser cooling experiments, the tunability and stability of UV lasers lead to many advantages.