Linewidths of Cu i(511 nm) and Au i(628 nm) laser transitions at room temperature

Sharp spectral lines are obtained for the Cu i 511 nm and the Au i 628 nm transitions from a sputtering‐based laser operating at room temperature. The Au i line exhibits a single peak with a linewidth of 360 MHz and the Cu i line consists of three well‐resolved peaks with linewidths of 800, 700, and 700 MHz in order of increasing frequency. The spectral lines result from saturated emission on the strongest hyperfine components.