Extended Data Fig. 2: Imaging performances through the FT spectrometer.
From: Full-field Brillouin microscopy based on an imaging Fourier-transform spectrometer
Images of a 1951 USAF resolution target, placed in the intermediate image plane, as seen through the FT spectrometer when the fixed arm is blocked and the moving arm is positioned at ΔL = 0 and ΔL = 300 m. We note that group 3 element 6 can still be resolved in both cases, corresponding to a resolution on the sample plane of 0.58μm. The overlay image highlights that, even with an increase of optical path of 2ΔL = 0.6 m, the images are still overlapping to a high degree which is essential to generate proper interference between the two interferometer arms.
