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The resonant filtering method transforming frequency modulated radiationfield into a train of short pulses is proposed to apply in optical domain.Effective frequency modulation can be achieved by electro-optic modulator or byresonant frequency modulation of the filter with a narrow absorption line. Dueto frequency modulation narrow-spectrum CW radiation field is seen by theresonant filter as a comb of equidistant spectral components separated by themodulation frequency. Tuning narrow-bandwidth filter in resonance with $n$-thspectral component of the comb transforms the radiation field into bunches ofpulses with $n$ pulses in each bunch. The transformation is explained by theinterference of the coherently scattered resonant component of the field withthe whole comb. Constructive interference results in formation of pulses, whiledestructive interference is seen as dark windows between pulses. It is foundthat the optimal thickness of the resonant filter is several orders ofmagnitude smaller than the necessary thickness of the dispersive filters usedbefore in optical domain to produce short pulses from the frequency modulatedfield.

Transformation of the frequency-modulated continuous-wave field into a train of short pulses by resonant filters