Fig. 2: Laser cooling beam delivery PIC.
From: Photonic integrated beam delivery for a rubidium 3D magneto-optical trap
a Layout of the laser cooling beam delivery PIC used to generate free-space beams for the 3D MOT. Fiber-coupled light is guided to a splitter and directed to the mode expanders and grating emitters. Bulk quarter waveplates are placed directly above each emitter. The dashed rectangle represents the height at which the beam profile is imaged. b PIC illuminated with red laser light to demonstrate the light propagation. The inset shows the MMI splitter and fiber coupling. c Image of the PIC beams incident on the paper sheet held parallel to the PIC surface at a height of 5 mm. The non-uniformity beam B3 is discussed in the Supplementary Note 4. d Perpendicular cross-section image of beam B1 and the profiles of the beam intensity for two axes of the beam emitter and the corresponding \({e}^{-2}\) beam widths.
