Faculté des sciences

Powerful fast triggerable 6 μm laser for the muonic hydrogen 2S-Lamb shift experiment

Antognini, A. ; Amaro, F. D. ; Biraben, F. ; Cardoso, J. M. R. ; Conde, C. A. N. ; Covita, D. S. ; Dax, A. ; Dhawan, S. ; Fernandes, L. M. P. ; Hänsch, T. W. ; Hughes, V. W. ; Huot, Olivier ; Indelicato, P. ; Julien, L. ; Knowles, Paul E. ; Kottmann, F. ; Liu, Y.-W. ; Lopes, J. A. M. ; Ludhova, Livia ; Monteiro, C. M. B. ; Mulhauser, Françoise ; Nez, F. ; Perry, B. N. ; Pohl, R. ; Rabinowitz, P. ; Santos, J. M. F. dos ; Schaller, Lukas A. ; Schwob, C. ; Taqqu, D. ; Veloso, J. F. C. A.

In: Optics Communications, 2005, vol. 253 (4-6), p. 362-374

Laser spectroscopy of the 2S-Lamb shift in muonic hydrogen (μ−p) is being performed at the Paul Scherrer Institute, Switzerland, to determine the root-mean-square (rms) proton charge radius with 10−3 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... Plus

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    Summary
    Laser spectroscopy of the 2S-Lamb shift in muonic hydrogen (μp) is being performed at the Paul Scherrer Institute, Switzerland, to determine the root-mean-square (rms) proton charge radius with 10−3 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 s−1 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 × 7 × 170 mm³).