Femtoscopy of identified particles at STAR

We present new measurements of $\mathrm{\Lambda }-\mathrm{\Lambda }$ correlations, which are closely related to $H$-dibaryon: a six quark state predicted by Jaffe (1977), in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV from the STAR experiment. Fits to different potential models are discussed and extracted scattering length and effective range are also presented.We also present spherical harmonic decomposition of pion-kaon correlation function for 0-5% centrality in Au+Au collision at $\sqrt{s_{NN}}=200$ GeV. In addition, we also discuss results from azimuthal HBT for beam energies 7.7-200 GeV.