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REFERENCES: "1) G. D. Boyd, H. Kasper, J. H McFee. Linear and nonlinear optical properties of AgGaS<sub>2</sub>, CuGaS<sub>2</sub>, and CuInS<sub>2</sub>, and theory of the wedge technique for the measurement of nonlinear coefficients, <a href=\"https://doi.org/10.1109/JQE.1971.1076588\"><i>IEEE J. Quant. Electron.</i>, <b>7</b>, 563-573  (1971)</a><br>2) G. C. Bhar, Refractive index interpolation in phase-matching, <a href=\"https://doi.org/10.1364/AO.15.0305_1\"><i>Appl. Opt.</i> <b>15</b>, 305-307 (1976)</a><br>*Ref. 2 provides Sellmeier equation based on the data from Ref. 1"
COMMENTS: "Extraordinary ray(e)"
DATA:
  - type: formula 2
    range: 0.49 12
    coefficients: 3.0172 1.5274 0.1310 2.1699 950
