| 摘要 |
Device for measuring variations of the gain of a laser amplifier at a particular wavelength, as a function of a pumping energy, said device comprising a source supplying continuous light radiation having the said wavelength and a power Pe, said radiation traversing the amplifier with a given radius, a means for tapping part of the amplified radiation at the output of the amplifier, a photoreceiver receiving said part and measuring the power &upbar& Ps thereof throughout the pumping time, a means for forming the quotient of Ps by Pe and supplying a signal G(t) representing the variations of the gain as a function of the pumping time, wherein the device also comprises means for supplying a signal E(t) representing the increase in the pumping energy used during pumping and means for extracting a signal G(E) representing the gain variations as a function of the pumping energy for the given radius from the two signals G(t) and E(t), by elimination of the time t. It also relates to a process which utilizes this device.
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