The Spectral Characteristics and Atmospheric CO2 Absorption of the Ho(+3):YLF Laser at 2.05 micrometers.
Research and development technical rept.,
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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This report presents the procedures used to obtain the spectral profile of the holmiumYLF laser and to calculate the absorption and self-broadening coefficients of CO2 from atmospheric transmittance data taken with this laser. Three laser wavelength regions are observed, one of which is resolved into a previously undetected doublet. The coincidence of the holmium laser radiation with the 4nu2 nu3 combination band of CO2 is determined to be principally with the R30 absorption line. Several partial pressures of CO2 from 0.5 to 10 torr are used, buffered with N2 to a total pressure of 760 torr. The line center absorption coefficient at atmospheric concentrations of CO2 0.25 torr determined from this work is 0.52 or - 0.07 per km. An average value of the self-broadening coefficient is determined to be 0.44. This information will be used in the evaluation of the holmium laser for field army applications. Author
- Atmospheric Physics
- Lasers and Masers