MHz repetition rate femtosecond radially polarized vortex laser direct writing Yb:CaF waveguide laser operating in continuous-wave and pulsed regimes.

In this paper, we report the use of femtosecond radially polarized vortex laser with MHz repetition rate for direct writing of cladding waveguides (WGs) and realization of waveguide laser oscillations in ytterbium-doped calcium fluoride crystal. The negative refractive index modification in Yb:CaF crystal is fabricated by the homemade all-fiber laser amplifier. At 976 nm pump wavelength, these Yb:CaF WGs can achieve continuous-wave (CW) laser oscillation.

Ternary ReSSealloys of different composition for Q-switched and mode-locked all-fiber laser.

This paper systematically studied the composition-controlled nonlinear optical properties and pulse modulation of ternary ReSSealloys for the first time. The compositionally modulated characteristics of ReSSeon the band gap were simulated based on the first principles. We investigated the effect of the band gap on the saturable absorption properties.

MoS/MXene pillared nanocomposite for ultrafast photonics applications.

In this work, we used nanocomposite saturable absorbers (SAs) in order to precisely design and modulate the process of compositing the light absorption by band gap engineering. Due to the higher absorption intensity of our MoS/MXene nanocomposite, we have successfully shortened the pulse duration (1.2s) of SA with enhancing saturable absorption intensity (7.