Abstract

A new broadband dispersive mirror (DM), which consists of Si and ${{\rm SiO} _{2}}$ layer materials operating in the spectral range of 3–6 µm, is developed for the first time, to our knowledge. The DM is able to compensate for the dispersion of a 0.5 mm thick GaAs crystal per bounce. Pulse analysis proves that the compensation effect of the DM is much better than a ${{\rm CaF} _{2}}$ plate, which is the commonly used dispersion compensation element in mid-infrared optical parametric oscillators (MIR OPOs), and the new MIR DM could improve the MIR OPO spectrum with better pulse quality and short pulse duration.

© 2021 Optical Society of America

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