Figure 4

Experimental setup. Component symbols: OI: optical isolator; W: window; SAS: saturation absorption spectroscopy; HWP: half-wave plate; PBS: polarizing beam splitter; A: aperture; QWP: quarter-wave plate; L: lens; PD: photodiode; AOM: acousto-optic modulator. Figure 4 is drawn by the first author (Zeeshan Ali Safdar Jadoon) using free open-source scalable vector graphics editor Inkscape (Version: 1.0.2-2) available at: https://inkscape.org/.