Influence on the Lifetime of 87Rb Bose-Einstein Condensation for Far-Detuning Single-Frequency Lasers with Different Phase NoisesSupported by the National Key Research and Development Program of China under Grant Nos 2016YFA0301600 and 2016YFA0301602, the National Natural Science Foundation of China under Grant Nos 11234008, 11474188 and 11704234, and the Fund for Shanxi '1331 Project' Key Subjects Construction

• Published in: Chinese physics letters Vol. 35; no. 6
• Main Authors: Peng, Peng, Huang, Liang-hui, Li, Dong-hao, Wang, Peng-jun, Meng, Zeng-ming, Zhang, Jing
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.06.2018
• ISSN: 0256-307X
• DOI: 10.1088/0256-307X/35/6/063201

We study the influence of the phase noises of far detuning single frequency lasers on the lifetime of Bose-Einstein condensation (BEC) of 87Rb in an optical dipole trap. As a comparison, we shine a continuous-wave single-frequency Ti:sapphire laser, an external-cavity diode laser and a phase-locked diode laser on BEC. We measure the heating and lifetime of BEC in two different hyperfine states: ∣ F = 2 , m F = 2 〉 and ∣ F = 1 , m F = 1 〉 . Due to the narrow linewidth and small phase noise, the continuous-wave single-frequency Ti:sapphire laser has less influence on the lifetime of 87Rb BEC than the external-cavity diode laser. To reduce the phase noise of the external-cavity diode laser, we use an optical phase-locked loop for the external-cavity diode laser to be locked on a Ti:sapphire laser. The lifetime of BEC is increased when applying the phase-locked diode laser in contrast with the external-cavity diode laser.