Micropulse lidars have the advantages of employing waveguide lasers that produce low pulse energy. These lasers tend to be less expensive, more compact, and all-solid state. They are more rugged, require no liquid cooling, and use less free-space optics (i.e., more fiber-based components) and, as such, are less sensitive to environmental conditions. On the other hand, because the backscatter signal resulting from each pulse is so small, micropulse lidars require the integration of backscatter intensity over many pulses [under most conditions, the signal-to-noise ratio (SNR) improves by the square root of the number of pulses in the integration period]. Furthermore, two additional disadvantages appear. First, because the detection systems are so sensitive, background radiation becomes a significant source of noise and requires careful filtering. Second, practical limitations in pulse rate begin to appear from second trip echoes. That is while any given pulse is traversing the region of primary interest (the first few kilometers range), backscatter signal from distant clouds or hard targets from previous pulses are superimposed on and confound the signal from the most recent pulse.