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    604 nm artifact with 532nm dpss lasers

    Hello, i'am working on a DIY Raman probe. I have checked three 532nm lasers : 1) 532nm cheap laser pointer 1mw 2) 532nm 50$ laser pointer 5mw 3) 532nm 200$ laser module, from Thorlabs, 4.5mw When i use my spectrometer (LR1 from Aseq), with any of this lasers, i can see that : 532 nm main wave...




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