We accurately measured the second-order nonlinear-optical coefficients of LaBGeO5 (LBGO) at the fundamental wavelength of 532 nm using the wedge technique. The values of d33, d22 and d31(=d32) were determined to be 1.15, 1.41 and 0.75 pm/V, respectively. The values are much larger than those estimated from our measured results at 1064 nm using Miller’s rule. Moreover, d33 is smaller than d22, the magnitude relation of which is inverse at 1064 nm. Then we need to remeasure at 1064 nm as well as measure the other d components.
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