在Cr原子沉积研究中，为了实现Cr原子的激光冷却与汇聚，必须将激光频率锁定在52Cr的425.55 nm7S3→7P04跃迁谱线上。鉴于Cr是高熔点金属，实验中设计并制造了一种通孔型的Cr氦空心阴极放电装置，采用放电溅射的方式制备了Cr原子蒸气，并应用偏振光谱稳频技术实现了激光稳频。该技术简化了实验装置，提高了实验效率。在不需要任何调制器件和锁相放大器的条件下，实验得到了高信号背景比的色散型信号。该信号被用作误差信号，将一台倍频钛宝石激光器的频率锁定在52Cr的7S3→7P04跃迁谱线上。锁定时间大于1 h，激光的频率波动小于±295 kHz。实验表明，该技术适用于高熔点金属的稳频。

To cool and focus the Cr atoms, the laser frequency must be locked to the 425.55 nm 7S3→7P04 transition of 52Cr in the research of Cr atom deposition. A see-through Cr-He hollow cathode discharge cell is designed and fabricated to sputter the atom vapor of Cr. Polarization spectroscopy is applied to lock the laser frequency. This technique not only simplifies the experimental equipment but also increases the efficiency. A high signal-to-background ratio dispersion signal is obtained without any modulation device or lock-in amplifier. This signal is used as error signal to lock a frequency-doubled Tisapphire laser to the 7S3→7P04 transition of 52Cr. A frequency fluctuation of ±295 kHz for more than one hour is achieved. The experimental results show that this technique is feasible to lock laser frequency to transitions of metals with high melting point.