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Goddard Space Flight Center
Near Earth Asteroid Rendezvous (NEAR) - Shoemaker Laser Altimeter "The NEAR-Shoemaker laser rangefinder (NLR) is a direct-detection single-pulse rangefinder. It uses a diode-pumped Nd:YAG laser transmitter, supplied by McDonnell Douglas, at a wavelength of 1.06 µm (1060 nm). The laser delivers a 15 mJ pulse of 12 ns duration. It has a maximum divergence of 300 mrad at the instrument's maximum range of 50 km. The resolution measured in test is better than 0.5 m. Repetition rates are selectable among 1/8 Hz, 1 Hz, 2 Hz, and 8 Hz (for a 2-second burst). An internal fiber optic calibration path is used for inflight calibration. The laser rangefinder is boresighted with the MSI.

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