RESUMEN
We report on beam combining of four narrow-linewidth fiber amplifier chains, running at different wavelengths and each delivering 500 W optical output power. The main amplifier stage consists of a large mode area photonic crystal fiber. The four output beams of the amplifier chains are spectrally (incoherent) combined using a polarization-independent dielectric reflective diffraction grating to form an output beam of 2 kW continuous-wave optical power with good beam quality (M(2)x = 2.0, M(2)y = 1.8).
RESUMEN
High-power operation of a selenium anti-Stokes Raman laser has been realized by application of an ArF excimer laser as a primary pump source. Radiation at 169 and 146 nm was generated with conversion efficiencies of up to 2.3% and output energies of up to 350 muJ in a 2-nsec pulse.
RESUMEN
The achievement of anti-Stokes Raman-laser oscillation in atomic Se at 158.7 and 167.5 nm using pump-laser radiation at 199.5 and 254.8 nm is reported. The necessary population inversion between the (1)S(0) and lower (1)D(2) or (3)P states is achieved by photodissociation of COSe molecules with ArF-laser radiation. Low-threshold pump energies of 0.5 and 20 microJ, respectively, indicate the possibility of generating high-power tunable VUV radiation.