Erbium Laser Propagation in Simulated Atmospheres. II. High Resolution Measurement Method.
Research and development technical rept.,
ATMOSPHERIC SCIENCES LAB WHITE SANDS MISSILE RANGE N MEX
Pagination or Media Count:
The transmission of laser energy in a carbon dioxide medium was measured in the 1.54 micrometer spectral region with a nominal resolution of 0.02 nonameter. An erbium laser was used which has two output emission regions in the eye-safe realm of the spectrum one region centered at 1.536 micrometers and 1.0 nanometer wide and the other centered at 1.543 micrometers and 2.0 nanometers wide. The CO2 sample was contained in a pressure and temperature controlled, 20-meter long, White cell. The monitor and transmitted laser pulses were detected by germanium photodiodes and recorded. A spectral scan over the laser output was obtained. A signal from the spectrometer was used to trigger the analyzer to accept only those laser spikes with wavelengths which fall within the preset wavelength window of the spectrometer. The spectrometer was scanned over the laser output and the transmission obtained as a function of wavelength. Data and theoretical calculations are presented for a 480-meter path length, a temperature of 30C, and a CO2 pressure of 660 torr. Author
- Atmospheric Physics
- Lasers and Masers