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A STL high-speed image converter camera has been used to study the time variation of the output radiation from a 15-cm long ruby laser, the latter being operated with detached external reflectors separated by 61 cm. These data offer additional support for the “hole-burning” model type of oscillation for ruby lasers. The simultaneous oscillation during one pulse of a ruby laser at two optical frequencies corresponding to the eigen-wavelength of the Fabry–Perot cavity has been photographed.
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DeMaria et al. (1963) studied this question.
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