| Popis: |
The Gemini Multi-Object Spectrograph (GMOS-N), with a field of view of 5.5 × 5.5 arc minutes, was used to obtain r' band images of the Keck II laser beam. The data samples the Rayleigh scattered laser beam at low elevations and the sodium spot at the highest elevation. The Rayleigh scattered part of the beam is large at low elevations, filling the GMOS-N field of view, with high surface brightness. At higher elevations (85 deg - 89.5 deg) it gets smaller and fainter. We also present data taken on the laser spot which we see at an elevation of 89.625, corresponding to a height in the atmosphere of ~100km. In addition, GMOS-N spectra and GMOS-N on-instrument wavefront sensor (OIWFS) data have been collected that allow us to characterize the effect that lasers from other telescopes might have on GMOS-N data. The OIWFS works at wavelengths which include the sodium D band. |
