Bartoli F J, Esterowitz L, Kruer M R, Allen R E
Appl Opt. 1975 Oct 1;14(10):2499-507. doi: 10.1364/AO.14.002499.
An experimental method for measuring the transient and steady-state thermal characteristics of ir photoconductors is introduced. Thermal recovery processes in laser irradiated HgCdTe (PC) detectors were investigated. The characteristics of thermal recovery processes are found to be quite sensitive to the specific details of detector construction. For the most part thermal recovery in these detectors takes place on two separate time scales. Initially the signal recovers partially to an intermediate level on a time scale of several milliseconds. The rest of the recovery occurs much more slowly, i.e., on the order of hundreds of milliseconds. It was found that the magnitude of the thermally induced signal, the relative importance of the two recovery processes, and the exact shape of the thermal recovery curve vary with power density and irradiation time. A one-dimensional thermal model of the detector for both pulsed and cw laser irradiation is presented. Calculated thermal recovery curves are found to agree we l with the experimental results for irradiation times as long as 20 msec. The two recovery times are found to be due to the two thermally resistive bonding layers. The utility of this model for predicting the thermal characteristics of new improved detector designs is discussed.
介绍了一种测量红外光电导体瞬态和稳态热特性的实验方法。研究了激光辐照HgCdTe（PC）探测器中的热恢复过程。发现热恢复过程的特性对探测器结构的具体细节非常敏感。在这些探测器中，热恢复大部分发生在两个不同的时间尺度上。最初，信号在几毫秒的时间尺度上部分恢复到中间水平。其余的恢复则要慢得多，即几百毫秒的量级。发现热致信号的幅度、两个恢复过程的相对重要性以及热恢复曲线的精确形状随功率密度和辐照时间而变化。给出了脉冲和连续波激光辐照下探测器的一维热模型。发现计算得到的热恢复曲线与长达20毫秒的辐照时间的实验结果吻合良好。发现这两个恢复时间是由于两个热阻粘结层造成的。讨论了该模型在预测新型改进探测器设计热特性方面的实用性。
