Electromagnetically Induced Transparency in a $\Lambda$-type Molecular System

We present an experimental study of EIT in a $\mathbf{\Lambda}$ -type molecular Lithium System. Co-propagating beam geometry is utilized in order to minimize the residual Doppler width. Single channel fluorescence was detected by using phase sensitive detection in our experiments. A coupling laser power dependent study of the EIT feature was carried out. Our findings have been complemented by theoretical studies of open systems that trace the presence of EIT starting from the density matrix equations. Numerical simulations have been performed and are in excellent agreement with the experimental results.