The Maker fringe method has been employed to determine the magnitude of the nonlinear optical susceptibility accurately in ferroelectric NaNO
2 as well as the relative sign in NaNO
2 and Ca
2Sr(CH
3CH
2CO
2)
b, both by rotating a plane-paralleled sample and by sliding a slightly wedge-shaped one. An analysis of the Maker fringe in nonabsorbing biaxial crystals has also been made, including corrections of the birefringence effect. As a result, we have obtained
d31=0.23±0.02,
d32=5.2±0.7,
d33=0.30±0.02,
d15=0.23±0.02 and
d24=5.2±0.7 in NaNO
2 relative to
d11 in quartz for a fundamental wavelength 1.06μm, and
d31•
d33<0,
d32•
d33>0,
d24•
d33>0 in NaNO
2 and
d31•
d33<0 in Ca
2Sr(CH
3CH
2CO
2)
6. Further, the domain effect, the experimental errors and a comparison of the sliding method with the rotating method are discussed.
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