Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9785661 | Optics Communications | 2005 | 13 Pages |
Abstract
Laser spectroscopy of the 2S-Lamb shift in muonic hydrogen (μâp) is being performed at the Paul Scherrer Institute, Switzerland, to determine the root-mean-square (rms) proton charge radius with 10â3 precision. A multistage laser system has been developed which provides 0.2 mJ pulse energy tunable at 6 μm wavelength. An excimer pumped dye laser is used to drive a titanium sapphire (Ti:Sa) system whose wavelength is then shifted to 6 μm using a multipass Raman cell filled with hydrogen. The short cavity length of the Ti:Sa oscillator (7 cm) guarantees a pulse width of 7 ns and a pulse energy of 1.2 mJ at 708 nm, a wavelength controlled by a mono-mode cw-Ti:Sa laser. The laser is triggered at a maximum 60 sâ1 repetition rate by muons entering the apparatus at random times. A new type of multipass cavity has been developed to provide a homogeneously illuminated volume (25 Ã 7 Ã 170 mm3).
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
A. Antognini, F.D. Amaro, F. Biraben, J.M.R. Cardoso, C.A.N. Conde, D.S. Covita, A. Dax, S. Dhawan, L.M.P. Fernandes, T.W. Hänsch, V.W. Hughes, O. Huot, P. Indelicato, L. Julien, P.E. Knowles, F. Kottmann, Y.-W. Liu, J.A.M. Lopes, J.F.C.A. Veloso,