1. A 461 nm Laser System and Hollow-Cathode Lamp Spectroscopy for Magneto-Optical Trapping of Sr Atoms
- Author
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Naotomo Takemura, Yoshio Torii, Yasuhiro Sakemi, Kotaro Umezawa, Yuki Yamanaka, and Takatoshi Aoki
- Subjects
Hollow-cathode lamp ,Materials science ,Absorption spectroscopy ,Amplifier ,Buffer gas ,Physics::Optics ,General Physics and Astronomy ,Second-harmonic generation ,Laser ,law.invention ,Wavelength ,law ,Physics::Atomic Physics ,Atomic physics ,Spectroscopy - Abstract
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.
- Published
- 2012