The diagram in Fig. 5 shows an example of this system, including relay minors, laser and pointing optics. Optics and pointing requirements Good laser transmission efficiency assumes that the diameter DE of the emission optics is approximated by the formula: DE = 2,44 kxZ/DR, with DR the receiver diameter, X the wavelength and Z the distance between emitter and receiver (Fig. 6). For the following calculations X has been set at 0.8 pm. For example, in the case of Fig. 1, with Z = 7,500 km and DR=3 m, DE is equal to 4.9 m. In the case of Fig. 2, the diameter of the relay mirror is about 4 m, and the other parameters remain the same. In the case of Fig. 3 with Z = 40,000 km, the relay mirror diameter is about 9 m (in this case DE = DR). For an LEO satellite supplying energy to a lunar base, the diameter of the optics on the satellite would be 10 m, and the diameter of the energy collector on the moon’s surface would be 75 m. This would provide a convenient and permanent power supply for a lunar base, even at “night”. Pointing accuracy (at 3 r.m.s) on the order
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