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A new possibility of laser cooling of alkaline-earth-metal and Ytterbiumatoms using a two-photon transition is analyzed. We consider a $^{1}S_{0}$ -$^{1}S_{0}$ transition, with excitation in near resonance with the $^{1}P_{1}$level. This greatly increases the two-photon transition rate, allowing aneffective transfer of momentum. The experimental implementation of thistechnique is discussed and we show that for Calcium, for example, two-photoncooling can be used to achieve a Doppler limit of 123 microKelvin. Theefficiency of this cooling scheme and the main loss mechanisms are analyzed.Comment: 7 pages, 5 figure

Two-photon Doppler cooling of alkaline-earth-metal and ytterbium atoms