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量子级联激光器 (QCL)是波长范围在中远红外的一类新型激光器 ,到目前为此 ,对于它的脉冲响应及调制响应等动态特性了解并不是很深入 ,为此以贝尔实验室在 1994年发明的量子级联激光器器件模型为基础 ,通过分析量子级联激光器中的电子在多量子阱间输运及跃迁的单极行为 ,得到它的速率方程。以此为基础 ,通过用电路元素对方程进行改造 ,建立起其相应的等效电路模型 ,利用PSPICE电路模拟软件进行模拟仿真 ,得到了它的调制响应特性 ,对可能影响其调制特性的一些因素如各阱之间的弛豫时间进行了讨论 ,并与其它类型激光器作了比较 ,发现量子级联激光器的动态性能并不优良 ,而这一点应缘于其独特的激射能级结构。
Quantum cascade laser (QCL) is a new type of laser in the far-infrared wavelength range. So far, its understanding of the dynamic characteristics such as impulse response and modulation response is not very deep. For this reason, Bell Labs Based on the quantum cascade laser device model of the invention, the rate equation of the quantum cascade laser is obtained by analyzing the unipolar behavior of the electrons in quantum cascade lasers in the transport and transition between multiple quantum wells. Based on this, by modifying the equation with the circuit elements, the corresponding equivalent circuit model is established and simulated by PSPICE circuit simulation software. Its modulation response characteristics are obtained. Some factors that may affect its modulation characteristics The relaxation times between wells are discussed and compared with other types of lasers. Quantum cascade lasers are found to have poor dynamic performance due to their unique lasing level structure.