The spectral characteristics and atmospheric CO2 absorption of the Ho(+)3: YLF laser at 2.05 micrometers
Abstract
This report presents the procedures used to obtain the spectral profile of the holmium:YLF 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.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- December 1975
- Bibcode:
- 1975STIN...7712386G
- Keywords:
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- Carbon Dioxide;
- Infrared Lasers;
- Absorption Spectra;
- Atmospheric Physics;
- Radiation Absorption;
- Lasers and Masers