【摘 要】
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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 di
【机 构】
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State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-electronics,Sha
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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 singlefrequency Ti:sapphire laser,an exteal-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,mF =2〉 and |F =1,mF =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 87 Rb BEC than the exteal-cavity diode laser.To reduce the phase noise of the exteal-cavity diode laser,we use an optical phase-locked loop for the exteal-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 exteal-cavity diode laser.
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