Figure 6
Comparative images between LED and SPDC illumination at increasing light levels. Two-photon event images acquired using LED and SPDC illumination over 10,000 frames. The ratio of two-photon events to one-photon events (2/1 event ratio) calculated from the rejected one-photon events is shown for each image. Increased two-photon to one-photon event ratios are seen when using the SPDC pair source. Also shown are the events per pixel per frame for the respective images. For the purposes of visualisation each pair of images are normalised to the same scale. This is performed using the maximum count within each image pair. Also shown are intensity cross-section plots for the displayed image pairs from the rows shown in Fig. 5. All events registered as per our described analysis are present in the images and no background subtraction has been performed.
