In the process of researching high-energy, high-power lasers, with the pump power raised, the threshold will raise, the efficiency will reduce, the refractive index distribution will be non-uniform.

在研制高能量，高功率激光器的过程中，人们发现当泵浦功率提高时，激光器的阈值会升高，效率会降低，折射率分布也会变得不均匀。

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It's proved that the cause of high threshold of thulium laser is the heat-distribution particle at low laser energy level.

理论和实验结果都表明引起铥激光器高阈值的主要原因是温度引起的激光下能级的热分布粒子。

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But solid explosives are high-energy metastability materials, when encountered external stimulation to the reactive threshold, a strong chemical reaction will occur.

固体炸药是一种蕴含高能量的亚稳态物质，遇外界刺激达到一定阈值就会发生强烈化学反应。

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