arosa_2020

Y. Arosa and R. de la Fuente, “Refractive index spectroscopy and material dispersion in fused silica glass”, Opt. Lett. 45, 4268 (2020)

Source record · Catalogue · Review register

DOI: 10.1364/ol.395510

Source kind: measurement

Recorded technique: White-light spectral interferometry (‘refractive index spectroscopy by broadband interferometry’, RISBI): the sample in one arm of a Michelson interferometer, three spectrometers (UV-Vis 260-480 nm, Vis 400-1000 nm, NIR 900-1700 nm; bandwidths in Fig. 2), the phase ambiguity resolved with an Abbe refractometer at the sodium D line (589.3 nm), the arm difference L from a further spectral interferogram (pp. 4268-4269). The refractive index (RI) comes from the unwrapped phase, Eq. (5); the group index (GI) independently, from the local period of the fringes, Eq. (6). Sample: a UV-grade fused silica plate made by Newport Corporation, 20 mm diameter, 2.0593 +- 0.0005 mm thick (micrometer).

Materials in structured entries: SiO2

Dataset quantities: None recorded.

Contents: 0 datasets; 1 formula.

Curation notes

Pages 4268-4271 are pdf pages 1-4. Identity checked against the first page.

WHAT IS HERE. The measured RI and GI are shown only as differences from fits (Fig. 3) and from Malitson (Fig. 4); the dispersion parameter D and its difference from Malitson’s in Fig. 5 (figures only, not digitised). No tabulated n. Temperature not stated. ‘The accuracy achieved using our device is approximately 0.0002 in RI units’ (p. 4269, citing their earlier work); ‘our experimental resolution (2 x 10^-4)’ against Malitson’s 1e-6 (p. 4270).

FITS (p. 4269-4270). Three three-term Sellmeier fits: Fit1 to the RI alone (rms 6.6e-6 from the measured RI, but a GI far from the measured one at long wavelengths); Fit2 to the GI alone; Fit3 to RI and GI together (maximum differences 1.4e-4 in RI and 3.7e-4 in GI, rms 2.7e-5 and 9.2e-5). Only Fit3’s coefficients are printed (Table 1). Against Malitson’s formula over 260-1700 nm the paper states maximum differences 1.1e-4 (RI) and 7.4e-4 (GI), rms 7.2e-5 and 3.0e-4; zero-dispersion wavelength 1.277 um for Fit3, ‘approximately 6 nm greater than the reference value’ (p. 4270).

TABLE 1 (image checked). Also prints Malitson’s coefficients rounded to four digits (0.6962, 0.4079, 0.8975; 0.068, 0.116, 9.896 um): a reproduction of malitson_1965/sellmeier, not recorded as a formula (the rounded poles change n by up to 4e-4 over 260-1700 nm).

COMPARISON. The refractiveindex.info page SiO2/Arosa (formula 1, 0.26-1.7 um, coefficients 0.9310, 0.079, 0.1735, 0.130, 2.1121, 14.918) is Table 1’s Fit3 exactly.

Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets

No datasets are recorded.

Formulas

arosa_2020/sellmeier_fit3

{
  "id": "sellmeier_fit3",
  "form": "n2_sellmeier",
  "terms": {
    "B": [
      "0.9310",
      "0.1735",
      "2.1121"
    ],
    "C": [
      "0.006241",
      "0.016900",
      "222.546724"
    ]
  },
  "range_nm": [
    260.0,
    1700.0
  ],
  "material": "SiO2",
  "equation": "Eq. (7) with Table 1 ('Present study'), p. 4270",
  "printed": "n^2(lambda) = 1 + c1 lambda^2/(lambda^2 - lambda1^2) + c2 lambda^2/(lambda^2 - lambda2^2) + c3 lambda^2/(lambda^2 - lambda3^2); C1 = 0.9310, C2 = 0.1735, C3 = 2.1121, lambda1 = 0.079, lambda2 = 0.130, lambda3 = 14.918 (um)",
  "variable": "lambda: wavelength in um (the medium is not stated)",
  "range": "260-1700 nm (the measured range); fitted to the measured RI and GI together (Fit3)",
  "coefficients": {
    "C1": "0.9310",
    "C2": "0.1735",
    "C3": "2.1121",
    "lambda1": "0.079",
    "lambda2": "0.130",
    "lambda3": "14.918"
  },
  "check": "With the printed (rounded) coefficients: zero-dispersion wavelength 1.2775 um (printed 1.277 um), 4.7 nm above Malitson's Eq. (1) (printed 'approximately 6 nm'); against Malitson over 260-1700 nm, maximum RI difference 2.6e-4 (at 260 nm; printed 1.1e-4) and rms 5.2e-5 (printed 7.2e-5), GI maximum 1.3e-3 (printed 7.4e-4). Not reproduced at the ultraviolet end: lambda1 and lambda2 are printed to two or three significant digits, which is enough to shift n there by 1e-4. Checked 2026-09-26."
}

The terms C are the squares of the printed lambda_i (0.079^2 = 0.006241, 0.130^2 = 0.016900, 14.918^2 = 222.546724). The authors’ preferred fit (‘the dispersion equation resulting from Fit3 was the one that best accounted for the material dispersion in FS’, p. 4270). Sample: Newport UV-grade fused silica; temperature not stated.

Corrections

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the review register for the checks and decisions.