Prechirp-controlled dispersive-wave tuning around 800 nm driven by a GHz-rate Yb fiber laser

We demonstrate prechirp-controlled dispersive-wave (DW) tuning around 800 nm using a GHz-rate Yb fiber laser and a photonic crystal fiber (PCF). By varying the separation of a transmission grating pair before the PCF, the DW wavelength is continuously tuned from 774 to 850 nm. The conversion efficiency remains from 13% to 5% over the tuning range. Compared with conventional power tuning, chirp control nearly twice the tuning range while maintaining higher DW power under our experimental conditions. This approach offers a simple route to compact tunable pulsed laser sources in this spectral region.