A compact all-solid-state DUV-laser source producing a short pulse at 228.5 nm is reported. The acoustically Q-switched quasi-three-level Nd∶YVO₄ laser at 914 nm is first intra-cavity frequency doubled into a blue laser with an LBO nonlinear crystal, and then into a DUV output from externally frequency doubling of the blue laser with a BBO nonlinear crystal. The 228.5 nm DUV pulsed laser output power of 10 mW is obtained, with a stable output power and good output beam quality. The present laser system is simple, compact and portable compared with the Ti: sapphire UV Raman laser reported earlier. Our laser source can be favorably used in the spectroscopic measurement of explosives and biomolecules.