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Comparing speed and SNR between SR844 and FPGA lock-in devices and detecting 2-photon absorption on crystals of rhodamine 6G on a slide. Images with 256 × 256 resolution were acquired at 3 scan rates: 12.5 kS/s (5.2 s/frame), 50 kS/s (1.3 s/frame), and 250 kS/s (0.26 s/frame). Signal and noise estimated from regions indicated with blue dashed box and white box, respectively.
