Color center laser and electron impact excitation: Doppler-free spectroscopy in excited helium states |
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| Authors: | H Gerhardt TW Hänsch |
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| Institution: | Department of Physics, Stanford University, Stanford, CA 94305, USA |
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| Abstract: | A cw single mode color center laser was used to study infrared transitions between n = 4 and n = 6 states in helium by Doppler-free intermodulated fluorescence spectroscopy. Excited helium atoms are produced by bombarding ground-state helium atoms with low energy electrons. With pulsed excitation and gated detection, the resolution approaches the natural linewidth. |
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