Generation of 656 nm coherent red-light by frequency-doubled Nd:YLiF4/β-BaB2O4 laser for a compact silver atoms optical clock
Résumé
We describe an efficient continuous-wave diode-pumped Nd:YLiF4 laser oscillating on the
σ-polarized 4F3/2−4I13/2 transition at λω = 1312 nm. With a simple linear cavity laser, we reached an
intracavity power of 310 W at λ = 1312 nm for 16 W of absorbed pump power (λp ∼ 806 nm). A 0.25 W
of 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 observed
using a 200 μm thin fused silica intracavity solid etalon. The optimal waist for a maximum conversion
efficiency 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 experimental
measurement of the optimal waist, we found a relative discrepancy of 2.84 × 10
−2. This laser is dedicated
to the spectroscopic study of silver atoms trapped in a buffer-gas-free paraffin coated Pyrex cell that will
be used in a compact atomic optical clock.
Domaines
Optique [physics.optics]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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