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Broadband difference frequency generation is theoretically and experimentally confirmed. It is shown that a wide tunable range of greater than 220nm (FWHM) around 4.2μm can be obtained in a 40mm long periodically poled lithium niobate crystal with a single quasi-phase-matched period at a certain temperature. The broad bandwidth can be explained by means of the group-velocity matching or phase-mismatch...
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