A 461 nm Laser System and Hollow-Cathode Lamp Spectroscopy for Magneto-Optical Trapping of Sr Atoms
A 461 nm Laser System and Hollow-Cathode Lamp Spectroscopy for Magneto-Optical Trapping of Sr Atoms
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DOI：
10.1143/jpsj.81.034401
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发表时间：
2012-02
影响因子：
1.7
通讯作者：
T. Aoki;Kota Umezawa;Y. Yamanaka;N. Takemura;Y. Sakemi;Y. Torii
中科院分区：
文献类型：
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作者：
T. Aoki;Kota Umezawa;Y. Yamanaka;N. Takemura;Y. Sakemi;Y. Torii
我们开发了一个激光系统，波长为461 nm，功率为175 mW，使用主振荡功率放大器（MOPA）系统和二次谐波产生（SHG）通过KNbO 3晶体。为了使激光频率稳定在原子吸收谱线上，我们测量了锶空心阴极灯的饱和吸收光谱。观察到兰姆凹陷信号和频率调制谱随泵浦光功率的变化。由于Ne缓冲气体的碰撞加宽增加了所观察到的信号的宽度，除了饱和效应。尽管如此增加的宽度（~ 100 MHz），我们证明了Sr原子的稳定磁光捕获。得到的原子数为1 × 10 7，足以进行各种超冷Sr原子实验。
We develop a laser system with a wavelength of 461 nm and a power of 175 mW using a master oscillation power amplifier (MOPA) system and second-harmonic generation (SHG) via a KNbO3 crystal. To stabilize the laser frequency to the atomic absorption line, we measured the saturated absorption spectrum of a Sr hollow-cathode lamp. The dependences of the Lamb dip signal and the frequency modulation spectrum on the pump beam power were observed. The collision broadening due to the Ne buffer gas increased the observed width of the signals in addition to the saturation effect. In spite of such an increased width (� 100 MHz), we demonstrated stable magneto-optical trapping of Sr atoms. The number of atoms obtained, 1 � 10 7 , is sufficient to proceed to various ultracold Sr atoms experiments.