Abstract
The second-harmonic generation nonlinear optical susceptibility of trigonal tellurium has been measured at 28.0 μm by the phase-matching technique. The value obtained was <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">|d_{11}| = (5.7 \pm 1.9) \cdot 10^{-10}</tex> m/V in MKS units. This value establishes the longest wavelength "standard" for the measurement of nonlinear optical susceptibilities by comparative techniques. Experimental details and data are given to justify the quoted uncertainty.
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