Based on previous positive experiences with Big Sky Laser products, we chose the air-cooled, diode-pumped, 40 mJ Centurion laser (Quantel, Bozeman, Montana). This laser is similarly robust to lasers we have used in the past and is diode-pumped, which provides better electrical efficiency. The Centurion outputs a 40-mJ pulse at 1064 nm, which is doubled to 532 nm. Any residual energy at 1064 nm is blocked. Pulse energy at 532 nm is 26 mJ, output divergence is 5 mrad, pulse length is 7.2 ns, and maximum PRF is 100 Hz. Our pulse-limited depth resolution is 80 cm in water, and with an 800 mega-samples per second (MSPS) digitizer, the sample-rate limited depth resolution in water is 14 cm.