A compact SPIDER system based on a pair of 180° folding right-angle prisms stretcher with a modified reconstruction algorithm

摘要

The pulse stretcher, a necessary part of the spectral phase interferometry for direct electric-field reconstruction (SPIDER) system, generates a chirped pulse to meet the quasi-CW condition by introducing optical material dispersion or angular dispersion. In this paper, a compact design of SPIDER with a pulse stretcher consisting of a pair of 180° folding right angle prisms (FRAPs) is proposed. The major advantages of the FRAPs include its insensitivity to misalignment, tunable dispersion in a large range, without inducing angular dispersion, low loss, and aberrationless. Moreover, we propose a modified algorithm with which the spectral phase errors of the recovered electric-field reconstructed with traditional SPIDER algorithm due to dispersion from the splitter of the Michelson interferometer can be alleviated effectually, and the modified algorithm is confirmed by both simulations and experimental measurements of two 800 nm ultrashort pulse chains with 43.5 and 29.8 nm bandwidths, respectively.