Vacuum-Ultraviolet Generation in CsLiB6O10

In previous publication 1 , we have reported the vacuum-ultraviolet (VUV) generation down to 0.185 μ m in CsLiB6O10 by mixing the fifth harmonic of a Nd:YAG laser at 1.0642 μ m and the output of a KTP OPO pumped by the second-harmonic of the same Nd: YAG laser. However, no attempt was made to evaluate its performance for VUV generation at wavelengths longer than 0.19 μ m in this material. As a prior experiment, we have demonstrated the VUV generation at 0.1914 μ m by type-2 mixing between the fifth harmonic of a Nd:YAG laser at 1.0642 μ m and the output of a H2 Raman oscillator pumped by the same Nd:YAG laser. The phase-matching parameters tabulated in Table 1 were calculated with the Sellmeier’s equations and thermooptic constants reported in Ref.1. The 12-mm-long crystal used in this experiment was cut at θ ≃ 41 ° and ϕ =0 ° for type-2 second harmonic generation (SHG) at 0.5321 μ m. The entrance faces were polished with a flatness of λ /10 and no AR-coatings are applied for this crystal.