Design, fabrication and characterization of third-order dispersion mirrors for femtosecond lasers

We developed an initial design method for a low-oscillation TOD mirror (TODM). The optimized TODM provided a TOD of -5000 fs3 with oscillations less than ±50 fs3 in a wavelength range of 890–960 nm.

To meet the requirements of an all-fiber femtosecond laser system, we simulated the application of the TODM in an ultrafast laser system to compensate for a positive TOD of +2.5×105 fs3. Sidelobe pulse oscillations were significantly suppressed after TODM compression, thereby improving pulse quality. Moreover, the laser-induced damage threshold of the TODM was measured to be approximately 0.20 J/cm² under irradiation with 16 fs laser pulses with a spectral bandwidth of 200 nm centered at 920 nm.