Rajnandan Choudhury Das

Sep 3, 2024 | link.aps.org | Rajnandan Choudhury Das |Thilagaraj Ravi |Samir Khan |Kanhaiya Pandey

The well-known sub-Doppler polarization gradient cooling in a type-I transition (Fe=Fg+1) is caused by red-detuned lasers. On the other hand, in a type-II transition (Fe≤Fg), sub-Doppler cooling takes place through blue-detuned lasers. This opposite behavior for the two types of transitions is due to spontaneously transferred coherence (STC). In the absence of STC, both types of transitions show blue-detuned cooling.

Jun 10, 2024 | link.aps.org | Rajnandan Choudhury Das |Thilagaraj Ravi |Samir Khan |Kanhaiya Pandey

We report continuous loading of Rb87 atoms in a magneto-optical trap (MOT) at narrow linewidth, 420-nm 5S1/2, F=2→6P3/2, F=3 blue transition (blue MOT). Continuous loading of the blue MOT is achieved by superimposing the blue laser beam inside a hollow core of infrared (IR) laser beam driving the broad 5S1/2, F=2→5P3/2, F=3 transition at 780 nm. We typically load ∼108 atoms in the blue MOT in 2.5 s.

Apr 4, 2024 | epjd.epj.org | Samir Khan |Rajnandan Choudhury Das |Thilagaraj Ravi |Kanhaiya Pandey

Eur. Phys. J.