Terahertz (THz) frequency sources such as quantum cascade lasers (QCLs) offer a variety of new applications in far-infrared frequency bands. For better understanding of their behavior, a device-specific modeling approach is used to predict the optical output power under current modulation and chip temperature. This letter reports the numerical simulation of gain switching to evaluate temperature dependence for short pulse generation in QCLs. Modified rate equations are used for self-consistent computation of emitted THz optical power from QCLs. The device emits at 116 µ m and is driven by various inputs such as haversine, tangential hyperbolic and square electrical pulses. From the simulation it is evident that the square input pulse requires the least magnitude current (0.83 A) at 15 K to generate pulses with minimum full width half maximum (FWHM). Moreover, when the peak amplitude of the square input signal is 1.01 A, it generates optical pulses with the least FWHM of 19...

中文翻译：

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冷指温度对2.59太赫兹量子级联激光器中光脉冲调制特性的影响

太赫兹（THz）频率源，例如量子级联激光器（QCL），在远红外频段提供了多种新应用。为了更好地了解它们的行为，使用了特定于器件的建模方法来预测电流调制和芯片温度下的光输出功率。这封信报道了增益切换的数值模拟，以评估温度依赖性，从而在QCL中产生短脉冲。修改后的速率方程式用于从QCL发出的THz光功率的自洽计算。该器件的发射波长为116 µm，由诸如haversine，切向双曲线和方波电脉冲的各种输入驱动。从仿真中可以明显看出，方形输入脉冲所需的电流最小（0。83 A）在15 K时产生具有最小全宽一半最大值（FWHM）的脉冲。此外，当平方输入信号的峰值幅度为1.01 A时，它会产生最小FWHM为19的光脉冲。