XUV diagnostic equipment was designed and utilized on the OMEGA target chamber at the University of Rochester to study high atomic number plasma generation by two‐wavelength laser excitation. Spectral data were collected from silver tracer dot targets irradiated with 1/3 TW of 0.35‐&mgr;m laser light of the multiple‐beam OMEGA laser and the single synchronized 1.06‐&mgr;m beam of the GDL laser for generating energetic electrons. XUV spectral data in the 30–300‐A˚ region were obtained with both a 3‐m grazing incidence spectrograph and a compact 1‐m grazing incidence spectrograph designed for reentrant mounting in the OMEGA chamber. High‐resolution x‐ray spectra were acquired in the 3.6–4.2‐A˚ region with a dual, flat‐diffraction crystal spectrograph. A low‐resolution x‐ray spectrum of silver was recorded with a curved mica spectrograph. Some x‐ray spectral lines appeared only when both OMEGA and GDL beams were used. These were identified as 2p–3s,3dtransitions in F‐like Ag xxxix. F‐, Na‐, and Mg‐like lines were found in the grazing incidence spectra, with F‐like lines appearing only with 1.06‐&mgr;m irradiation.