Doppler-free intermodulated fluorescence spectroscopy of 4He 23P–31,3D transitions at 588 nm with a 1-W compact laser system
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We have demonstrated Doppler-free intermodulated fluorescence spectroscopy of helium 23P–31,3D transitions in an rf-discharged sealed-off cell using a compact laser system at 588 nm. An external cavity diode laser at 1176 nm was constructed to seed a Raman fiber amplifier. Laser power of more than 1 W at 588 nm was produced by frequency doubling of the fiber amplifier output using a MgO:PPLN crystal. A doubling efficiency of 23 % was achieved. The power-dependent spectra of the 23P–33D transitions were investigated. Furthermore, the Doppler-free spectrum of the spin-forbidden 23P–31D transitions was observed for the first time. Our results are crucial toward precision test of QED atomic calculations, especially for improving the determination of the helium 31D–33D separation.
KeywordsStimulate Brillouin Scattering External Cavity Diode Laser Intercombination Transition Raman Fiber Amplifier Asymmetric Lineshape
This project is supported by the Ministry of Science and Technology and the Ministry of Education of Taiwan. L.-B.W. receives support from Kenda Foundation as a Golden-Jade fellow.
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