Fig. 1. Schematic diagram of the “wedge-crystal”-like gas cell (lower part), integrated with the monolithic lens-window-prism (LPW) device. (a) A photograph of the custom-made LiF-LPW device. (b) The integrated flange that can be fixed onto the other end of the gas cell.

Fig. 2. Schematic diagram of the experimental setup for the generation of a 10.7 eV beam source. The input laser is from a homemade 347 nm femtosecond laser with a repetition rate of 1 MHz. (a) The previously obtained beam profile. (b) The beam profile obtained with the LWP device. Phototube: Hamamatsu Photonics R1187.

Fig. 3. Beam profiles on the fluorescence plate taken with a CCD camera when different UV powers were used.

Fig. 4. Experimentally measured decay of the average powers using LiF-LWP and ${\mathrm{MgF}}_2$-LWP in vacuum conditions. The black lines are fitted results using exponential decay. For both cases, the normalized intensity 1.0 corresponds to a real power of 8 μW.

Fig. 5. Average power of the 10.7 eV beam with the chamber filled with nitrogen. LiF-LWP was used here.