The DATA in Metal-dielectric dispersive mirrors for ultraviolet lasers

Fig. 1. (a) Layer structure of the UDM without a shortwave reflection enhancement structure (SWRES). (b) Layer structure of the MDDM which has a SWRES constructed in the surface layers. In (b), structure (1) represents a short wave reflection enhancement structure (SWRES) at the surface; structure (2) represents a chirped structure composed of materials with high and low refractive indices, which is optimized by (aiHbiL) n ; structure (3) represents a reflective structure that provides high reflectivity, which is optimized by M(HL) m. Fig. 2. (a) Group-delay dispersion (GDD) of UDM and MDDM. (b) Reflectance of UDM and MDDM. A shortwave reflective structure (SWRES) in the surface layer can effectively suppress the GDD aberration of the MDDM. Fig. 3. (a) Group-delay dispersion (GDD) of UDM with and without the metal layer. (b) Reflectance of UDM with and without the metal layer. Using a metal layer in the dispersive mirror can widen the working band but may also generate large GDD oscillations. Fig. 4. Electric field of the MDDM, UDM with and without a metal (Al) layer at (a) 294.7 nm and (b) 304.4 nm. Fig. 5. Electric field of the UDM at 294.7, 300, 304.4, and 310 nm.Fig. 6. Group-delay dispersion (GDD) and reflectance (R) of the design and production. The solid black curves represent design data, and the solid red and blue curves represent data measured after production. The reflectance and GDD are shown for an angle of incidence of 6°, p-polarized light. Fig. 7. Experimental setup. UV dispersion mirrors in the optical path reflected the light four times. The pulse was tested using a self-diffraction FROG. Fig. 8. (a) Measured and (b) retrieved FROG traces. (c) Measured (black) and retrieved (red) spectrum. (d) Temporal intensity envelope of the retrieved (red) and simulated (black) pulses.