Detection of NaRb Feshbach Molecule By Photodissociation

We demonstrate detection of $^{23}Na^{87}Rb$ Feshbach molecule by combining molecular photodissociation and absorption imaging of the photofragments. The photodissociation process is studied by tuning the laser frequency above the Na ($3S_{1/2},|F=1,m_F=1\rangle$) to Na ( $3P_{3/2},|m_I=3/2,m_J=1/2\rangle$) transition, from which we observe a “shelf” like dissociation lineshape. Following the dissociation, the accurate number of molecules can be obtained by detecting either the resultant Rb or Na atoms. We also studied the heating effects caused by the photodissociation laser and optimized the best detection protocol for extracting accurate information of the molecular cloud.