Figure 2
From: Interferometric measurements of refractive index and dispersion at high pressure
Schematic of our experimental setup. Interference fringe spectrum and ring pattern are obtained from the sample in the DAC with white (yellow) and laser (green) beams, respectively. Arrows indicate the direction of beam propagation from light sources to the sample through the objective lens and to the camera or the spectrometer. We also use a laser to align the tilt and rotation angles of the DAC (black dotted). The focal lengths of the achromatic doublet (L1 and L2) and plano-convex (L3 and L4) lenses are 50, 50, 100, and 200 mm, respectively. A 300 µm diameter pinhole is at the focus of L1. Bottom left inset shows the focuses of a parallel incident beam (black dotted) and two reflected beams (red and yellow) at the conjugate focal planes (black dashed).
