Abstract
The far-field pattern of an onboard laser transmitter was measured
with a transatmospheric optical link with a distance of ∼33,000 km
between the satellite and the optical ground station. The far-field
pattern was acquired with a new method used to analyze statistically
downlink irradiance data obtained at the ground station. The
statistical tracking and pointing characteristics of the transmitter
were taken into account in estimating downlink irradiance, assuming
that there were no atmospheric scintillation effects. The peak
directive gain of the downlink laser beam was 104.3 dB. The beam
width (full width at half-maximum) was 28.5 × 17.5
μrad. These results were consistent with the results from
a laboratory test undertaken before launch of the satellite.
© 1998 Optical Society of America
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