| 专利名称 | Apparatus and method of power measurement for pulsed terahertz quantum-cascade laser | 申请号 | US201113641777 | 专利类型 | US | 公开（公告）号 | US8749225(B2) | 公开（授权）日 | 2014.06.10 | 申请（专利权）人 | 中国科学院上海微系统与信息技术研究所 | 发明（设计）人 | TAN ZHIYONG;CAO JUNCHENG;HAN YINGJUN;CHEN ZHEN | 主分类号 | G01R13/38 | IPC主分类号 | G01R13/38 | 专利有效期 | Apparatus and method of power measurement for pulsed terahertz quantum-cascade laser 至Apparatus and method of power measurement for pulsed terahertz quantum-cascade laser | 法律状态 | 说明书摘要 | The present invention provides a power measurement apparatus and method for a pulsed terahertz quantum-cascade laser (THz QCL). The apparatus includes a light source part, a light path part, and a detection part. Terahertz light emitted by a THz QCL reaches a terahertz quantum-well photodetector (THz QWP) through the measurement apparatus, and is absorbed to generate a corresponding current signal. A signal processing circuit extracts a voltage signal from the current signal, amplifies the voltage signal, and inputs the amplified voltage signal to an oscilloscope for reading and displaying. According to a responsivity of the THz QWP at a lasing frequency of the laser, the measurement of the output power of the pulsed THz QCL is acquired. The present invention avoids integration estimation when a thermal detector is used to measure output power of a THz QCL in a pulse operating mode, and can directly acquire the power value of a pulsed output from the laser according to the amplitude of the detector responding to the pulsed terahertz light. |
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