The Temporal Measurement of Infrared Femtosecond Fiber Laser Pulse with Complex Spectra: SPIDER and FROG

Abstract Femtosecond fiber laser pulse (FFLP) is very suitable for precision processing (PLP) with the advantages of high power, compact integrated structure, and easy installation. However, power increasing, nonlinear optical effects (NOE) fiber, such as self-phase modulation (SPM), will be greatly enhanced, spectra output complex, which considerably increases temporal complexity FFLP takes an immeasurable influence on PLP, so it great significance to accurately measure property higher accuracy PLP. This paper presents a self-referencing spectral phase interferometry direct electric-field reconstruction based single grating stretcher (SGS-SPIDER) two-step shift (TSPS) method measuring complex infrared spectra. Meanwhile, we present modified pulse-retrieval algorithm called adaptive (APRA) frequency-resolved gating (FROG) reconstruct measured accurately. The duration reconstructed by FROG 162 fs, whose autocorrelation curve similar including picosecond background. error trace 0.42%, reliable enough according literature experience. Finally, unique ultrashort pulses are compared SPIDER; that is, has wider range than SPIDER. These studies provide new diagnostic technique complete characterization extend measurement application SPIDER at wavelength band, significant improving PLP using FFLP.