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VUV radiation around 159 nm is obtained toward direct excitation of a singletrapped $^{115}$In$^{+}$ ion. An efficient fluoride-based VUV output-coupler isemployed for intracavity high-harmonic generation of a Ti:S oscillator. Usingthis coupler, where we measured its reflectance to be about 90%, an averagepower reaching $6.4\,\mu$W is coupled out from a modest fundamental power of650 mW. When a single comb component out of $1.9\times10^{5}$ teeth is resonantto the atomic transition, hundreds of fluorescence photons per second will bedetectable under a realistic condition.

Generation of vacuum ultraviolet radiation by intracavity high-harmonic generation toward state detection of single trapped ions