Single-mode optical pumping of CF4 to generate 16-μm frequencies has been extended to include the isotopic species 12CF413CF4, and 14CF4 for the lasing medium and 16O12C16O and 18O12C18O for the CO2 pump laser. Thirty-three lasing transitions, between 614 and 645 cm−1, and their respective energies are reported and discussed in relation to pertinent spectroscopic parameters.
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TCF4 = 100 K, PCF4 = 4–6 Torr, except where noted.
626 and 828 are abbreviations for 12C16O2 and 12C18O2, respectively.
Measured immediately before the CF4-laser grating.
Measured offset = (CF4 absorption line frequency) − (CO2 laser line frequency). Values in parentheses are offsets taken from diode spectra2,8 that differ from our measured value by at least ±100 MHz, whereas our estimated experimental error is no greater than ±60 MHz.
Relative intensities calculated for T = 150 K.2,4,8
Split: the extent of the spectroscopically predicted fine splitting in the absorption feature.8
[E (16 μm)/E (9 μm)] × 100, where E (9 μm) is measured immediately before the CF4-laser grating.
The absorption feature is made up of two or more absorptions, each of about the quoted relative intensity but separated by more than 50 MHz. The highest relative intensity value is listed, the number of features is given in parentheses in the Relative Intensity column, and the total splitting of all features is given in parentheses in the Split column.
Assignment not rigorously determined because transition not explicitly identified in absorption spectrum. PCF4 =2 Torr. PCF4 = 0.5 Torr.
Measured by Radziemski et al. in Ref. 11.
Frequency determined with a lower-resolution spectrometer, and so uncertainty > ±0.1 cm−1.
Frequency calculated from spectroscopic theory.7
Ground state-absorption (0 → ν4) believed to hinder lasing.
Tables (3)
Table 1
12CF4, 13CF4, and 14CF4 Lasing Frequencies versus Pump Linea
TCF4 = 100 K, PCF4 = 4–6 Torr, except where noted.
626 and 828 are abbreviations for 12C16O2 and 12C18O2, respectively.
Measured immediately before the CF4-laser grating.
Measured offset = (CF4 absorption line frequency) − (CO2 laser line frequency). Values in parentheses are offsets taken from diode spectra2,8 that differ from our measured value by at least ±100 MHz, whereas our estimated experimental error is no greater than ±60 MHz.
Relative intensities calculated for T = 150 K.2,4,8
Split: the extent of the spectroscopically predicted fine splitting in the absorption feature.8
[E (16 μm)/E (9 μm)] × 100, where E (9 μm) is measured immediately before the CF4-laser grating.
The absorption feature is made up of two or more absorptions, each of about the quoted relative intensity but separated by more than 50 MHz. The highest relative intensity value is listed, the number of features is given in parentheses in the Relative Intensity column, and the total splitting of all features is given in parentheses in the Split column.
Assignment not rigorously determined because transition not explicitly identified in absorption spectrum. PCF4 =2 Torr. PCF4 = 0.5 Torr.
Measured by Radziemski et al. in Ref. 11.
Frequency determined with a lower-resolution spectrometer, and so uncertainty > ±0.1 cm−1.
Frequency calculated from spectroscopic theory.7
Ground state-absorption (0 → ν4) believed to hinder lasing.
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