A method and apparatus for tunable filter linearization of a Fourier-Domain Mode Locking (FDML) laser for a SS-OCT comprising the steps of: choosing a fundamental frequency that avoids the mechanical resonance frequencies of a tunable filter； summing two or three harmonically related sinusoids of the fundamental frequency； and tuning the amplitudes and phases of the summed sinusoids to compensate for nonuniformities in amplitude and phase responses of the tunable filter.
