Fig. 5
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Sketch of the BWOPO amplifier setup (left). It was pumped with 8 ns pulses at 1064 nm. Part of the pump beam was used to pump the PPKTP OPA crystals. The backward beam had a bandwidth of 274 MHz at 1856 nm and was tunable with temperature of the BWOPO crystal, as seen in the graph to the right [30].
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