Yan, MiDeSalvo, B.J.Ramachandhran, B.Pu, H.Killian, T.C.2016-04-052016-04-052013Yan, Mi, DeSalvo, B.J., Ramachandhran, B., et al.. "Controlling Condensate Collapse and Expansion with an Optical Feshbach Resonance." <i>Physical Review Letters,</i> 110, no. 12 (2013) American Physical Society: 123201. http://dx.doi.org/10.1103/PhysRevLett.110.123201.https://hdl.handle.net/1911/88856We demonstrate control of the collapse and expansion of an Sr88 Bose-Einstein condensate using an optical Feshbach resonance near the S01−P13 intercombination transition at 689 nm. Significant changes in dynamics are caused by modifications of scattering length by up to ±10abg, where the background scattering length of Sr88 is abg=−2a0 (1a0=0.053  nm). Changes in scattering length are monitored through changes in the size of the condensate after a time-of-flight measurement. Because the background scattering length is close to zero, blue detuning of the optical Feshbach resonance laser with respect to a photoassociative resonance leads to increased interaction energy and a faster condensate expansion, whereas red detuning triggers a collapse of the condensate. The results are modeled with the time-dependent nonlinear Gross-Pitaevskii equation.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevLett.110.123201