lamy_1977#
P. L. Lamy, “Optical constants of crystalline and fused quartz in the far ultraviolet”, Appl. Opt. 16, 2212 (1977)
Source record · Catalogue · Review register
DOI: 10.1364/ao.16.002212
Source kind: measurement
Recorded technique: Near-normal-incidence reflectance (9 degrees, no collimator; unchanged between 5 and 9 degrees) of a Z-cut crystal-quartz plate and a Tetrasil SE fused-silica plate (Electro-Quartz), both 5 mm thick, polished with cerium oxide and outgassed by gentle heating in vacuum, at the 21 emission lines of an H2-filled MacPherson lamp from 1026 to 1640 A, in the vacuum monochromator of the Laboratoire de Technologie Optique (Al + MgF2 coated grating); 1980-4000 A with a standard double monochromator (p. 2212). Kramers-Kronig analysis of the reflectance (Philipp and Taft’s phase integral), extended below 1000 A with Philipp’s crystal-quartz data (450-1000 A) or Platzoder and Steinmann’s fused-quartz data (500-1000 A) and the asymptotic forms R = 1.658e-12 omega^-4 (crystal) and 9.6e-13 omega^-4 (fused), omega in A^-1; and above 2000 A with the Smithsonian Physical Tables, Spitzer and Kleinman (crystal, to 35 um), Malitson, Drummond and Steyer and Huffman (fused, to 50 um). A constant was subtracted from the phase so that k >= 0 and k and the phase vanish in the transparent range (p. 2213).
Materials in structured entries: SiO2, SiO2_quartz
Dataset quantities: extinction_coefficient, refractive_index
Contents: 4 datasets; 0 formulas.
Curation notes#
Journal pages 2212-2214 = pdf pages 1-3 (p. 2214 is half a page; the rest of the pdf page is the journal’s meetings calendar, and the extraction mixes its lines into the reference list). Identity checked against the first page. Table I (p. 2213): ‘The Complex Index of Refraction of Crystalline Quartz (Ordinary Ray) and Fused Quartz’, N and K against wavelength in angstrom, 1000-1650 A; the complex index is written m = n - ik (p. 2212), so K is the usual (positive) extinction coefficient. Fig. 1 (reflectance of both, with the values adopted for the analysis dashed) and Fig. 2 (N and K with Osantowski’s and Platzoder and Steinmann’s points) are figures only, not digitised.
THE ROWS. The measured range is 1026-1640 A; the 1000 and 1020 A rows and the 1650 A row rest on the extrapolated reflectance (Philipp’s or Platzoder and Steinmann’s data below 1000 A, and the longer-wavelength data). The wavelengths are those of a vacuum monochromator in the vacuum ultraviolet, i.e. vacuum wavelengths (the paper does not say so explicitly). K is not printed where the analysis gives no usable value: from 1450 A (crystal) and 1550 A (fused). Four small K values carry a third digit in parentheses (‘0.08(4)’), read as 0.084 (see the extraction script); the paper does not explain the parentheses. The crystal-quartz K at 1200 A is printed ‘1 25’, the decimal point lost in the print; read as 1.25 (extraction script).
ACCURACY. No uncertainty is stated for Table I. Lamy’s checks (pp. 2213-2214): for fused quartz, ‘excellent agreement with those of Platzoder and Steinmann at 1216 A and with those of Osantowski except for k at 920 A and 1048 A’; for crystal quartz, eps_2 agrees ‘very well’ with Philipp’s graphical result except below 800 A, while ‘the oscillations of the eps_1 curve are shifted by a few angstroms, and our eps_1 is larger by typically 0.2’. Extended to the infrared, the n ‘was found in excellent agreement with published data for all wavelengths up to 10 um, with an absolute error not exceeding 0.007’; ‘The validity of the results of the Kramers-Kronig analysis for the extinction coefficient is restricted to sufficiently large values (k >~ 0.05)’ (p. 2214), which the smallest printed K values (0.043-0.084) approach. The fused-quartz reflectance agrees ‘excellent’ with Platzoder and Steinmann’s (20 degrees) and differs from Philipp’s, ‘whose peaks are somewhat narrower particularly the one centered at approximately 1220 A’; the crystal reflectance agrees with Philipp’s (p. 2212).
COMPARISON WITH philipp_1985 (Palik’s Table X, fused silica). Philipp’s 25-11.4 eV values (philipp_1985/philipp_lamy_n, _k) are a smooth curve drawn through Philipp’s and this paper’s Kramers-Kronig results; they are not a reprint of Table I, so nothing there is re-pointed (they overlap Table I only at 1000-1088 A, where they agree with Table I’s fused-quartz values within 0.04 in n and 0.03 in k: n = 1.550, k = 0.873 at 1050 A, interpolated, against 1.51 and 0.89 here). Above 1100 A Table X holds Philipp’s own n (philipp_vuv_n) and transmission-based k (weinberg_k, transmission_curve_k), and the two sets differ strongly (checked 2026-09-27, Table X interpolated to Table I’s wavelengths): Philipp’s n peaks at 2.33 at 1228 A and is 0.29-0.33 above Lamy’s at 1200-1220 A, then 0.06-0.11 below it at 1300-1500 A; Lamy’s k exceeds the transmission k from 1210 A on, by a factor 6 at 1300 A (0.40 against 0.064) and 40 at 1500 A (0.043 against 0.0011). Lamy’s fused-quartz structure is broader and lower than Philipp’s, as he says of the reflectance, and his long-wavelength k is a limit of the Kramers-Kronig analysis, not an absorption measurement.
The crystal is alpha-quartz cut perpendicular to its optic axis (Z-cut) and measured near normal incidence, so the field is perpendicular to the axis: the ordinary ray, as the caption says (axis = o). The sample temperature is not stated (room temperature). refractiveindex.info’s copies in data/external have no page for this paper.
Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.
Datasets#
lamy_1977/quartz_o_n#
{
"id": "quartz_o_n",
"material": "SiO2_quartz",
"file": "SiO2_quartz/lamy_1977__quartz_o_n.csv",
"table": "tbl_1c325c8f2d92",
"quantity": "refractive_index",
"abscissa_unit": "angstrom",
"use": "primary",
"parameters": {
"axis": "o",
"form": "bulk",
"technique": "Kramers-Kronig analysis of reflectance",
"index_medium": "vacuum"
}
}
Table I, crystalline quartz (ordinary ray), N, 1000-1650 A: Kramers-Kronig analysis of the Z-cut crystal’s near-normal reflectance. No uncertainty stated.
lamy_1977/quartz_o_k#
{
"id": "quartz_o_k",
"material": "SiO2_quartz",
"file": "SiO2_quartz/lamy_1977__quartz_o_k.csv",
"table": "tbl_1c325c8f2d92",
"quantity": "extinction_coefficient",
"abscissa_unit": "angstrom",
"use": "primary",
"parameters": {
"axis": "o",
"form": "bulk",
"technique": "Kramers-Kronig analysis of reflectance"
}
}
Table I, crystalline quartz (ordinary ray), K, 1000-1400 A (not printed beyond). The 1200 A cell prints ‘1 25’ (decimal point lost; read 1.25); 1350 and 1400 A print ‘0.08(4)’ and ‘0.05(5)’ (read 0.084, 0.055). The paper restricts the Kramers-Kronig k to k >~ 0.05 (p. 2214).
lamy_1977/fused_n#
{
"id": "fused_n",
"material": "SiO2",
"file": "SiO2/lamy_1977__fused_n.csv",
"table": "tbl_1c325c8f2d92",
"quantity": "refractive_index",
"abscissa_unit": "angstrom",
"use": "primary",
"parameters": {
"grade": "Tetrasil SE",
"form": "bulk",
"technique": "Kramers-Kronig analysis of reflectance",
"index_medium": "vacuum"
}
}
Table I, fused quartz (Tetrasil SE, Electro-Quartz), N, 1000-1650 A: Kramers-Kronig analysis of near-normal reflectance, extended below 1000 A with Platzoder and Steinmann’s reflectance. No uncertainty stated.
lamy_1977/fused_k#
{
"id": "fused_k",
"material": "SiO2",
"file": "SiO2/lamy_1977__fused_k.csv",
"table": "tbl_1c325c8f2d92",
"quantity": "extinction_coefficient",
"abscissa_unit": "angstrom",
"use": "primary",
"parameters": {
"grade": "Tetrasil SE",
"form": "bulk",
"technique": "Kramers-Kronig analysis of reflectance"
}
}
Table I, fused quartz (Tetrasil SE), K, 1000-1500 A (not printed beyond). 1450 and 1500 A print ‘0.08(0)’ and ‘0.04(3)’ (read 0.080, 0.043). The paper restricts the Kramers-Kronig k to k >~ 0.05 (p. 2214); at these wavelengths k is far above the intrinsic absorption edge’s transmission values (philipp_1985/transmission_curve_k gives 1.1e-3 at 1500 A and 7e-3 at 1450 A), so the tail of this column is an artefact of the analysis’s limits, not an absorption measurement.
Formulas#
No formulas are recorded.
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.