W. C. Swann and S. L. Gilbert, "Pressure-induced shift and broadening of 1560–1630-nm carbon monoxide wavelength-calibration lines," J. Opt. Soc. Am. B 19, 2461-2467 (2002)
We have measured the line centers and the pressure-induced shifts of 14 lines in the 3ν rotational–vibrational band of carbon monoxide, and 18 lines in the corresponding band of These lines can be used as wavelength references in the optical fiber communication wavelength-division multiplexing L band (approximately 1565–1625 nm). The spectrum has useful reference lines from 1560 to 1595 nm, and the spectrum has lines from 1595 to 1630 nm. We observed that, except for a shift of 35 nm toward longer wavelengths for the spectrum, the behaviors of the two isotopic species are similar. We found that the pressure shift varies with line number, from ∼+0.01 to +0.02 pm/kPa (∼0.16 to 0.31 MHz/Torr). In addition, we measured the pressure broadening of these lines; we found that it also varies with line number and is typically 0.3–0.4 pm/kPa (approximately 5–7 MHz/Torr).
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Line-Center, Pressure-Shift, and Pressure-Broadening Resultsa
Line
Line Center Extrapolated to Zero Pressure (nm)
Shift Coefficient
Broadening Coefficient
pm/kPa
MHz/Torr
pm/kPa
MHz/Torr
1560.50004(24)
0.0188(20)
-0.309(32)
0.267(14)
4.38(22)
1562.59327(20)
0.0157(18)
-0.257(29)
0.273(12)
4.47(20)
1564.74563(14)
0.0154(8)
-0.251(13)
0.294(8)
4.80(14)
1568.03555(10)
0.0147(6)
-0.239(10)
0.315(6)
5.12(10)
1570.33051(14)
0.0131(10)
-0.212(16)
0.339(8)
5.49(12)
1572.86770(20)
0.0109(16)
-0.176(26)
0.388(12)
6.27(20)
1573.76745(24)
0.0097(20)
-0.157(32)
0.407(14)
6.57(22)
1575.64836(24)
0.0112(20)
-0.180(32)
0.413(14)
6.65(22)
1576.62961(20)
0.0115(18)
-0.185(29)
0.385(12)
6.19(20)
1578.67400(16)
0.0139(14)
-0.223(22)
0.359(12)
5.76(20)
1581.94641(16)
0.0159(10)
-0.254(16)
0.330(8)
5.27(12)
1586.69708(16)
0.0172(14)
-0.273(22)
0.312(8)
4.95(12)
1591.89544(20)
0.0182(18)
-0.285(28)
0.295(12)
4.65(18)
1597.54775(24)
0.0191(20)
-0.299(31)
0.279(14)
4.37(22)
Results for the measured lines of the 3ν band of carbon monoxide
at a temperature of
Line-center vacuum wavelength results are for low-pressure conditions; our measurements (column 2) are values obtained by extrapolation of the line center to zero pressure. The broadening coefficient is the pressure dependence of the FWHM of the Lorentzian component of the Voigt line profile. The uncertainties in the final digits of the values are indicated in parentheses. The uncertainties quoted are the expanded uncertainties obtained by application of a coverage factor
(i.e., our quoted uncertainty is ±2σ).
Table 2
Line-Center, Pressure-Shift, and Pressure-Broadening Resultsa
Line
Line Center Extrapolated to Zero Pressure (nm)
Shift Coefficient
Broadening Coefficient
pm/kPa
MHz/Torr
pm/kPa
MHz/Torr
1595.37446(20)
0.0200(20)
-0.314(38)
0.253(16)
3.97(26)
1596.58693(20)
0.0187(20)
-0.293(34)
0.272(16)
4.27(25)
1598.03287(18)
0.0160(18)
-0.250(28)
0.287(12)
4.50(20)
1599.71196(16)
0.0160(12)
-0.250(20)
0.303(10)
4.74(15)
1600.96157(16)
0.0152(12)
-0.237(18)
0.313(8)
4.88(13)
1603.03136(12)
0.0152(8)
-0.237(14)
0.326(8)
5.07(12)
1605.33673(16)
0.0134(12)
-0.208(20)
0.345(10)
5.36(16)
1607.87857(20)
0.0106(20)
-0.164(32)
0.401(14)
6.20(22)
1608.77849(20)
0.0101(20)
-0.157(38)
0.419(16)
6.47(26)
1610.65814(20)
0.0111(20)
-0.171(36)
0.424(16)
6.54(24)
1611.63775(20)
0.0118(20)
-0.182(32)
0.410(14)
6.31(22)
1613.67706(18)
0.0136(16)
-0.209(26)
0.368(14)
5.65(21)
1616.93687(16)
0.0167(14)
-0.255(20)
0.342(10)
5.23(16)
1619.24491(16)
0.0171(14)
-0.261(22)
0.329(10)
5.02(16)
1621.66151(18)
0.0184(14)
-0.280(22)
0.320(10)
4.87(15)
1624.18751(18)
0.0175(16)
-0.265(24)
0.318(12)
4.82(18)
1628.18261(20)
0.0191(20)
-0.288(34)
0.300(16)
4.52(22)
1632.42759(20)
0.0209(20)
-0.314(36)
0.286(16)
4.29(24)
Results for the measured lines of the 3ν band of carbon monoxide
at a temperature of
Line center-vacuum wavelength results are for low-pressure conditions; our measurements (column 2) are values obtained by extrapolation of the line center to zero pressure. The broadening coefficient is the pressure dependence of the FWHM of the Lorentzian component of the Voigt line profile. The uncertainties in the final digits of the values are indicated in parentheses. The uncertainties quoted are the expanded uncertainties obtained by application of a coverage factor
(i.e., our quoted uncertainty is ±2σ).
Tables (2)
Table 1
Line-Center, Pressure-Shift, and Pressure-Broadening Resultsa
Line
Line Center Extrapolated to Zero Pressure (nm)
Shift Coefficient
Broadening Coefficient
pm/kPa
MHz/Torr
pm/kPa
MHz/Torr
1560.50004(24)
0.0188(20)
-0.309(32)
0.267(14)
4.38(22)
1562.59327(20)
0.0157(18)
-0.257(29)
0.273(12)
4.47(20)
1564.74563(14)
0.0154(8)
-0.251(13)
0.294(8)
4.80(14)
1568.03555(10)
0.0147(6)
-0.239(10)
0.315(6)
5.12(10)
1570.33051(14)
0.0131(10)
-0.212(16)
0.339(8)
5.49(12)
1572.86770(20)
0.0109(16)
-0.176(26)
0.388(12)
6.27(20)
1573.76745(24)
0.0097(20)
-0.157(32)
0.407(14)
6.57(22)
1575.64836(24)
0.0112(20)
-0.180(32)
0.413(14)
6.65(22)
1576.62961(20)
0.0115(18)
-0.185(29)
0.385(12)
6.19(20)
1578.67400(16)
0.0139(14)
-0.223(22)
0.359(12)
5.76(20)
1581.94641(16)
0.0159(10)
-0.254(16)
0.330(8)
5.27(12)
1586.69708(16)
0.0172(14)
-0.273(22)
0.312(8)
4.95(12)
1591.89544(20)
0.0182(18)
-0.285(28)
0.295(12)
4.65(18)
1597.54775(24)
0.0191(20)
-0.299(31)
0.279(14)
4.37(22)
Results for the measured lines of the 3ν band of carbon monoxide
at a temperature of
Line-center vacuum wavelength results are for low-pressure conditions; our measurements (column 2) are values obtained by extrapolation of the line center to zero pressure. The broadening coefficient is the pressure dependence of the FWHM of the Lorentzian component of the Voigt line profile. The uncertainties in the final digits of the values are indicated in parentheses. The uncertainties quoted are the expanded uncertainties obtained by application of a coverage factor
(i.e., our quoted uncertainty is ±2σ).
Table 2
Line-Center, Pressure-Shift, and Pressure-Broadening Resultsa
Line
Line Center Extrapolated to Zero Pressure (nm)
Shift Coefficient
Broadening Coefficient
pm/kPa
MHz/Torr
pm/kPa
MHz/Torr
1595.37446(20)
0.0200(20)
-0.314(38)
0.253(16)
3.97(26)
1596.58693(20)
0.0187(20)
-0.293(34)
0.272(16)
4.27(25)
1598.03287(18)
0.0160(18)
-0.250(28)
0.287(12)
4.50(20)
1599.71196(16)
0.0160(12)
-0.250(20)
0.303(10)
4.74(15)
1600.96157(16)
0.0152(12)
-0.237(18)
0.313(8)
4.88(13)
1603.03136(12)
0.0152(8)
-0.237(14)
0.326(8)
5.07(12)
1605.33673(16)
0.0134(12)
-0.208(20)
0.345(10)
5.36(16)
1607.87857(20)
0.0106(20)
-0.164(32)
0.401(14)
6.20(22)
1608.77849(20)
0.0101(20)
-0.157(38)
0.419(16)
6.47(26)
1610.65814(20)
0.0111(20)
-0.171(36)
0.424(16)
6.54(24)
1611.63775(20)
0.0118(20)
-0.182(32)
0.410(14)
6.31(22)
1613.67706(18)
0.0136(16)
-0.209(26)
0.368(14)
5.65(21)
1616.93687(16)
0.0167(14)
-0.255(20)
0.342(10)
5.23(16)
1619.24491(16)
0.0171(14)
-0.261(22)
0.329(10)
5.02(16)
1621.66151(18)
0.0184(14)
-0.280(22)
0.320(10)
4.87(15)
1624.18751(18)
0.0175(16)
-0.265(24)
0.318(12)
4.82(18)
1628.18261(20)
0.0191(20)
-0.288(34)
0.300(16)
4.52(22)
1632.42759(20)
0.0209(20)
-0.314(36)
0.286(16)
4.29(24)
Results for the measured lines of the 3ν band of carbon monoxide
at a temperature of
Line center-vacuum wavelength results are for low-pressure conditions; our measurements (column 2) are values obtained by extrapolation of the line center to zero pressure. The broadening coefficient is the pressure dependence of the FWHM of the Lorentzian component of the Voigt line profile. The uncertainties in the final digits of the values are indicated in parentheses. The uncertainties quoted are the expanded uncertainties obtained by application of a coverage factor
(i.e., our quoted uncertainty is ±2σ).