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(a) The wavelength spectrum of the combined beam of OCT and PAT after passing wavelength division multiplexer (WDM); (b) The recoupling optical power of the light beam back reflected from a mirror moving away from the lens tip, plotted in terms of the mirror distance from the tip; (c) Edge spread function (ESF) obtained from a knife-edge mirror (square-symbol black line) and line spread function (LSF) obtained by taking the derivative of ESF (round-symbol blue line).
