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a, Principle of balanced detection. b Noise suppression of the home-built auto-balanced detector optimized for 10MHz signal. c Noise spectrum of the fibre laser with (red) and without (blue) autobalanced detection. The theoretical shot-noise is indicated in grey. d,e, SRS images of 1.1 polystyrene beads with (d) and without (e) auto-balanced detection. Scale bars, 5.
