Photon Statistics for Injection Lasers
Statistical distributions of the output of lasers, often referred to as photon or photoelectron statistics, contain valuable information about coherent properties of lasers. Using the well known photon counting technique, extensive data and detailed theoretical explanations have been obtained from gas lasers.(1) However, no statistical measurements have been made on injection lasers. The main reason is that these injection lasers are not very coherent. They tend to have fast and rather large fluctuations. In fact, the radio-frequency (RF) spectrum of the noise extends to the low gigahertz range.(2,3) The photon counting technique and conventional electronics are not fast enough to monitor these fluctuations. Since many applications, e. g., optical communications, depend on these miniature lasers, it is important to study their coherent properties.
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