Spectrally resolved interferometry combining up-chirped and down-chirped pulses allows for millimeter range
resolution in laser ranging applications. Key in our approach is the use of temporally stretched optical pulses of 5
nanoseconds in duration. These stretched pulses were obtained from a femtosecond semiconductor mode-locked laser
and were up-chirped and down-chirped using a chirped fiber Bragg grating and recombined to realize spectral
interferometry. This approach provides a means to achieve the high pulse energies required for a laser radar application
which are easy to achieve using nanosecond pulses but maintains the high spatial resolution associated with
femtosecond optical pulses.