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尽管双包层光纤激光器的散热性能好于传统的固体激光器的散热性能,光纤激光器中的热沉积仍然是限制提高其输出功率的重要因素.以双端抽运的400W双包层光纤激光器为实例,定量分析了光纤内的热沉积分布.根据所建立的散热模型,为了确保千瓦级双包层光纤激光器安全稳定的运行,抽运端附近的对流换热系数应大于2.8×10-2W·cm-2K-1.据此设计出高功率双包层光纤激光器抽运端冷却装置并成功应用在激光系统中,获得了千瓦级的激光输出.
Although the thermal performance of double-clad fiber lasers is better than that of the traditional solid-state lasers, thermal deposition in fiber lasers is still an important factor that limits the output power enhancement.With the double-ended 400W double-clad fiber lasers as an example , Quantitatively analyzed the thermal deposition distribution in the fiber.According to the established thermal model, in order to ensure the safe and stable operation of the kilowatt double-clad fiber laser, the convection heat transfer coefficient near the pumping end should be greater than 2.8 × 10-2W · cm -2K-1. Based on this, a high-power double-clad fiber laser pumping end cooling device is designed and successfully applied in a laser system, and a kilowatt-class laser output is obtained.