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We have constructed the high intensity VUV laser system with an optical-field-induced ionization (OFI) Ar 2 * amplifier. The evaluated maximum one-pass gain value of the OFI Ar 2 * amplifier was 1.17 cm -1 .The progress of an ultrashort-pulse high-intensity laser is mainly based on solid-state laser media, such as a Ti:Sapphire laser. The lasing wavelengths are thus inevitably limited to the near infrared (IR) and visible spectral regions. In contrast, ultrashort-pulse lasers in the ultraviolet (UV) and vacuum ultraviolet (VUV) wavelength regions have not well been developed. The nonlinear wavelength conversion such as harmonic generation has been used to generate ultrashort UV and VUV pulses. The conversion efficiency is, however, low especially in the deep VUV region, since only available nonlinear media are low-density gases. As a result, observed pulse energy was limited to the order of nJ [1], which may be too small for applications.