Abstract

Flat-top-pulse generation with a duty ratio close to 50% is considered for a periodical sawtooth phase-modulated CW laser field propagating through a group-delay-dispersion circuit. Pulses are formed at a quarter of the Talbot condition. The proposed method is compared with a binary phase-modulated field. It is shown that well-defined square-wave-type optical pulses are formed if a quarter of the Talbot condition is satisfied with the accuracy $10^{-3}$ for both phase modulation patterns. Other fractional Talbot conditions, i.e., $1/3$ , $1/6$ and $1/8$ , are analyzed demonstrating multilevel temporal patterns similar to spatial patterns, which were observed in Fresnel diffraction of light from a phase grating. Technical advantages of the sawtooth phase modulation compared with the binary phase modulation are discussed.

Unified approach to describe optical pulse generation by propagation of periodically phase-modulated CW laser light

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Multifocal spot array generated by fractional Talbot effect phase-only modulation

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