The development of high-power semiconductor laser is one of the key projects of the Commission of science, technology and industry for national defense in the eighth and ninth five year plans. It is also the key technology of photoelectric technology among the sixteen key technologies of national defense. The operation of high-power InGaAs / GaAs quantum well lasers is realized for the first time in China.
In lasers with several longitudinal modes oscillating simultaneously, some effects not seen in single-mode lasers can be observed. Since there is no "perfect" method to deal with the saturation effect of multimode lasers, it is generally limited to the discussion of lamb's "third-order" solution.
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