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We report continuous loading of $^{\textrm{87}}$Rb atoms in a magneto-opticaltrap (MOT) at narrow linewidth, 420 nm 5S$_{1/2}$, F$=2\rightarrow$ 6P$_{3/2}$,F$=3$ blue transition (blue MOT). Continuous loading of the blue MOT isachieved by superimposing the blue laser beam, inside a hollow core of infraredlaser beam driving the broad 5S$_{1/2}$, F$=2\rightarrow$ 5P$_{3/2}$, F$=3$transition at 780 nm. We typically load $\sim10^{8}$ atoms in the blue MOT in2.5 seconds. We characterize the continuous loading of blue MOT with variousparameters such as magnetic field gradient, detuning, power and diameter ofblue MOT beam and diameter of the hollow core (spot) inside the IR MOT beam. Weobserve that the blue laser beam should overfill the spot of the IR laser beam.This is because the blue laser cools the atoms to a lower temperature even inthe presence of the broad IR laser i.e. in the overlapped region and hencehelps in loading. We also present the theoretical framework for cooling atomsin the presence of simultaneously two transitions to support the experimentalresult. This method of continuous loading of the blue MOT can be useful toproduce a continuous atomic beam of cold Rb atoms.

Continuous loading of magneto-optical trap of Rb at narrow transition