科研之友
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摘要
Angle-tuned dual signal quasi-phase-matched (QPM) optical parametric generator (OPG) based on periodically poled MgO-doped lithium niobate (PPMgLN) pumped by an acousto-optically Q-switched Nd:YVO4 laser is reported. The PPMgLN crystal is 50 mm long and has a periodical phase reversed grating structure. The grating period is 29.6 μm and the phase reversed period is 6.808 mm. The crystal is periodically poled along the z-axis by using the external electric poling technique. While the crystal is rotated over the range of 0°~8°, the dual signal wavelengths can be rapidly tuned from 1474.8 to 1479 nm and 1489.5 to 1495.2 nm. The theoretical analysis for angle-tuned dual signal OPG is also presented. The calculated results show good agreement with the experimental data.
