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For many years, lunar laser ranging (LLR) observations using a greenwavelength have suffered an inhomogeneity problem both temporally andspatially. This paper reports on the implementation of a new infrared detectionat the Grasse LLR station and describes how infrared telemetry improves thissituation. Our first results show that infrared detection permits us to densifythe observations and allows measurements during the new and the full Moonperiods. The link budget improvement leads to homogeneous telemetricmeasurements on each lunar retro-reflector. Finally, a surprising result isobtained on the Lunokhod 2 array which attains the same efficiency as Lunokhod1 with an infrared laser link, although those two targets exhibit adifferential efficiency of six with a green laser link.

Lunar laser ranging in infrfared at hte Grasse laser station