Shot-Noise Limited Time-Encoded Raman Spectroscopy

Figure 3

Strategy for time synchronization of the FDML sweep to the TICO-Raman technique. Interference fringes from the FDML probe light are generated by inserting an objective glass slide (~1 mm thick) into the beam. These fringes are used to determine the phase of the FDML sweep. This phase can then be adjusted on the arbitrary waveform generator (AWG), such that the first pulse (vertical line) of the TICO-Raman pattern [17] coincides with the lowest wavelength of the sweep. This is crucial for a correct time-to-wavenumber mapping in the TICO-Raman technique.