抄録
For the detection of hydrogen atoms in plasma devices by the resonance scattering technique, a coherent tunable narrow-band source at the Lyman α(Lα: 121.6 nm) line is developed. Lα radiation is generated by frequency tripling of a Xe Cl-laser-pumped dye laser in phase-matched Kr and Kr/Ar mixtures. The condition for phase matching and the effect of Ar addition are consistent with the theoretical predicts of the nonlinear optics. For a 1-MW input at 365 nm, 6.6 × 109 photons (1.1W, 10ns) per pulse at the Lα line are generated in Kr at 80 Torr. The detection sensitivity of hydrogen atoms by the resonance scattering technique at the Lα line is briefly discussed.
