The article concerns the issue of high-energy lasers. The Bivoj laser system at Hilase facility in Dolní Břežany generates laser pulses in the near-infrared region (1030 nm) with energy up to 146 J. Recently, the Bivoj laser output wavelength was converted to 343 nm (one third), with an efficiency of 53 %. The achieved pulse energy was 50 J at 10 Hz repetition rate. The average power achieved exceeded the current record by more than two times.
High average power laser beams in near-UV region are typically realized by efficient frequency conversion from near-IR wavelengths. Recently, a record pulse energy of 50 J was achieved at Hilase, Dolní Břežany, at 10 Hz repetition rate at 343 nm wavelength by subjecting 1030 nm high power laser beam to type-I harmonic conversion to 515 nm and type-II harmonic conversion to 343 nm.