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International audienceWe describe an efficient continuous-wave diode-pumped Nd:YLiF4 laser oscillating on theσ-polarized 4F3/2−4I13/2 transition at λω = 1312 nm. With a simple linear cavity laser, we reached anintracavity power of 310 W at λ = 1312 nm for 16 W of absorbed pump power (λp ∼ 806 nm). A 0.25 Wof tunable radiation (λ2ω = 656−658 nm) was obtained by intracavity second-harmonic generation (SHG)with a 5×5×7 mm3 β-BaB2O4 crystal. Up to 10 mW of tunable single-frequency operation was observedusing a 200 μm thin fused silica intracavity solid etalon. The optimal waist for a maximum conversionefficiency has been calculated theoretically using Boyd and Kleiman model. For the 1312−656 nm SHG,we found a walk-off parameter B = 8.99 and an optimal waist of 25 μm. Comparing to the experimentalmeasurement of the optimal waist, we found a relative discrepancy of 2.84 × 10−2. This laser is dedicatedto the spectroscopic study of silver atoms trapped in a buffer-gas-free paraffin coated Pyrex cell that willbe used in a compact atomic optical clock

international journal of metrology and quality engineering

Generation of 656 nm coherent red-light by frequency-doubled Nd:YLiF4/β-BaB2O4 laser for a compact silver atoms optical clock