高功率Laser棒材热性能的空间分辨热反射光谱研究
Thermal Properties of High Power Laser Bars Investigated by Spatially Resolved Thermoreflectance Spectroscopy
摘要：
在这项工作中，我们提出的高功率激光棒的热性能的分析结果，通过空间分辨热反射（TR）光谱。热反射是一种利用脉冲电流对激光器端面温度进行周期性调制的调制技术。激光器的周期性温度变化引起折射率的变化，从而调制探测光束的反射率。该技术的空间分辨率约为1 $μ$ m，可用于300 $μ$ m × 300 $μ$ m区域的温度测绘。在这些实验中获得的信息提供了对发生在器件的小面处的热过程的洞察，并因此导致这种结构的可靠性增加和寿命显著延长。
英文摘要：
In this work we present results of the analysis of thermal properties of high-power laser bars obtained by spatially resolved thermoreflectance (TR) spectroscopy. Thermoreflectance is a modulation technique relying on periodic facet temperature modulation induced by pulsed current supply of the laser. The periodic temperature change of the laser induces variation of the refractive index and consequently modulates probe beam reflectivity. The technique has a spatial resolution of about ~1 $μ$m and can be used for temperature mapping over 300 $μ$m x 300 $μ$m area. Information obtained in these experiments provide an insight into thermal processes occurring at devices' facets and consequently lead to increased reliability and substantially longer lifetimes of such structures.
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