The inherent fluctuations of the pulsed atom laser in F=2 manifold of   87Rb atoms
  We have observed the intensity fluctuations of the F=2 87Rb atom laser at low output coupling rate. Theoretically, we find that the atom loss of the condensate due to the output of atom laser leads to fluctuations of the laser pulses, which is inherent in all state changing out-coupling such as rf and Raman. Another reason leading to large fluctuations is the interference of output pulses. 
Lin Xia, Fan Yang, Xiaoji Zhou and Xuzong Chen