Extended Data Fig. 10: Beam profile cross-section.
From: Light-wave-controlled Haldane model in monolayer hexagonal boron nitride
The beam profiles of three interferometer arms were measured at the focal plane of the objective on a CMOS detector. The wavelength of 2ω arm results in a single-photon response (SPR), whereas the other two arms produce a two-photon response on the detector given the band gap of silicon. To determine the waist (ω0), this was considered producing the orange and purple curves for the 2 µm cases.
