| Autor: |
Heinecke, D., Liebherr, T., Battles, D., Schleisiek, K., Fehrenbacher, D., Baatzsch, A., Herding, M., Dahl, C., Schäfer, H. |
| Zdroj: |
CEAS Space Journal; Dec2019, Vol. 11 Issue 4, p459-473, 15p |
| Abstrakt: |
Lidar systems have become an important technology in a variety of industrial and scientific applications. For terrestrial applications, such systems have been developed over the last decade and are commercially available. In space, this technology does not have a comparable maturity level and is still far from being a standard technology. In this paper, we present the operating principle, the design, and performance of the spaceborne absolute frequency reference used in the instrument of the French–German methane remote-sensing lidar mission, MERLIN. The MERLIN instrument operates on a methane absorption feature at 1645.55 nm. To achieve the accuracy goal for the column-integrated methane concentration of 3 ppb, absolute frequency accuracy levels in the low MHz range are required. The absolute frequency reference unit provides the stabilized seed lasers for the high-power laser sources at the required wavelengths and measures the absolute frequency of the outgoing laser pulses by means of a wavemeter. The focus of this paper is on the implementation of the absolute frequency referencing and the obtained frequency stability and accuracy. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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