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We present a high-power tunable deep-ultraviolet (DUV) laser that uses twoconsecutive cavity enhanced doubling stages with LBO and CLBO crystals toproduce the fourth harmonic of an amplified homebuilt external cavity diodelaser. The system generates up to 2.75 W of 261.5 nm laser light with a ~2 Wstable steady-state output power and performs second harmonic generation in alargely unexplored high intensity regime in CLBO for continuous wave DUV light.We use this laser to perform fluorescence spectroscopy on the$X^1\Sigma\leftarrow A^1\Pi$ transition in a cold, slow beam of AlCl moleculesand probe the $A^{1} \Pi|v'=0,~J'=1>$ state hyperfine structure for futurelaser cooling and trapping experiments. This work demonstrates that theproduction of tunable, watt-level DUV lasers is becoming routine for a varietyof wavelength-specific applications in atomic, molecular and optical physics.

A stable 2 W continuous-wave 261.5 nm laser for cooling and trapping aluminum monochloride