Pressure-induced shift and broadening of 1560-1630-nm carbon monoxide wavelength-calibration lines

摘要

We have measured the line centers and the pressure-induced shifts of 14 lines in the 3nu rotational-vibrational band of carbon monoxide, (C16O)-C-12 and 18 lines in the corresponding band of (CO)-C-13-O-16. These lines can be used as wavelength references in the optical fiber communication wavelength-division multiplexing L band (approximately 1565-1625 nm). The (CO)-C-12-O-16, spectrum has useful reference lines from 1560 to 1595 nm, and the 130160 spectrum has lines from 1595 to 1630 nm. We observed that, except for a shift of 35 nm toward longer wavelengths for the (CO)-C-13-O-16 spectrum, the behaviors of the two isotopic species are similar. We found that the pressure shift varies with line number, from similar to+0.01 to +0.02 pm/kPa (similar to0.16 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). [References: 14]