Progress toward an optical frequency standard based on a single Indium ion

We report on the current status of the optical frequency standard based on a single In-115(+) ion. A single Indium ion is being trapped in a Paul-Strauble type trap and cooled in combination of Doppler cooling and sideband cooling to its lowest vibrational states. To interrogate the S-1(0)-(3)p(0) clock transition with high accuracy we demonstrate a Hz-level laser system resonant to this transition. With the current setup we are able to achieve a measured linewidth of the clock transition of 260 Hz. The statistical uncertainty of the absolute frequency measurement is 3 x 10(-13), limited mainly by our reference frequency standard