Influence on the Lifetime of $^{87}$Rb Bose–Einstein Condensation for Far-Detuning Single-Frequency Lasers with Different Phase Noises
Peng Peng1,2 , Liang-hui Huang1,2 , Dong-hao Li1,2 , Peng-jun Wang1,2 , Zeng-ming Meng1,2 , Jing Zhang1,2**
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-electronics, Shanxi University, Taiyuan 0300062 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006
Abstract ：We study the influence of the phase noises of far detuning single frequency lasers on the lifetime of Bose–Einstein condensation (BEC) of $^{87}$Rb 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: $|F=2,m_{F}=2\rangle$ and $|F=1,m_{F}=1\rangle$. Due to the narrow linewidth and small phase noise, the continuous-wave single-frequency Ti:sapphire laser has less influence on the lifetime of $^{87}$Rb 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.
收稿日期: 2018-02-18
出版日期: 2018-05-19
:
32.70.Cs
(Oscillator strengths, lifetimes, transition moments)
03.75.Nt
(Other Bose-Einstein condensation phenomena)
67.85.Jk
(Other Bose-Einstein condensation phenomena)
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2018, Vol. 35 
