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We present an all-solid-state laser source emitting up to 2.1 W ofsingle-frequency light at 671 nm developed for laser cooling of lithium atoms.It is based on a diode-pumped, neodymium-doped orthovanadate (Nd:YVO$_4$) ringlaser operating at 1342 nm. Optimization of the thermal management in the gainmedium results in a maximum multi-frequency output power of 2.5 W at thefundamental wavelength. We develop a simple theory for the efficientimplementation of intracavity second harmonic generation, and its applicationto our system allows us to obtain nonlinear conversion efficiencies of up to88%. Single-mode operation and tuning is established by adding an etalon to theresonator. The second-harmonic wavelength can be tuned over 0.5 nm, andmode-hop-free scanning over more than 6 GHz is demonstrated, corresponding toaround ten times the laser cavity free spectral range. The output frequency canbe locked with respect to the lithium $D$-line transitions for atomic physicsapplications. Furthermore, we observe parametric Kerr-lens mode-locking whendetuning the phase-matching temperature sufficiently far from the optimumvalue.

2.1-watts intracavity-frequency-doubled all-solid-state light source at 671 nm for laser cooling of lithium