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Q: Quantenoptik
Q 35: Laser Spectroscopy
Q 35.3: Talk
Friday, April 6, 2001, 16:15–16:30, H 2013
Ultrastable laser for the In+ optical frequency standard — •Mario Eichenseer, Thomas Becker, Alexander Nevsky, Ekkehard Peik, Christian Schwedes, Joachim von Zanthier, and Herbert Walther — Max-Planck-Institut für Quantenoptik and Sektion Physik der LMU München, 85748 Garching
The In+ ion is a very promising candidate for an optical frequency standard. This paper deals with the lasers necessary to investigate the clock transition: The fourth harmonic of the 946 nm line of the Nd:YAG laser can be used to excite the narrow 1S0 → 3P0 line. We have built two diode laser pumped Nd:YAG lasers, one in a linear configuration made from discrete optical elements and one quasi-monolithic nonplanar ring laser and have frequency-stabilized the lasers to two stable reference resonators of high finesse. The beat signal between the two independent systems shows a linewidth of 2.2 Hz for an averaging time of 2 s. Application of the system to ultrahigh-resolution spectroscopy of In+ will be described.