# High efficiency second harmonic generation of nanojoule-level femtosecond pulses in the visible based on BiBO

VIP专享 2021-02-22 08:13:47 4.07MB PDF
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We demonstrate high efficiency second harmonic generation (SHG) of near infrared femtosecond pulses using a $\text｛BiB｝_｛3｝\text｛O｝_｛6｝$ crystal in a single-pass tight focusing geometry setup. A frequency doubling efficiency of $63\%$ is achieved, which is, to the best of our knowledge, the highest value ever reported in the femtosecond regime for such low energy (nJ-level) pumping pulses. Theoretical analyses of the pumping scheme focusing waist and the SHG efficiency are performed, by numerica

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