Method for calibrating absolute responsivity of terahertz quantum well detector and device thereof

A device for calibrating an absolute responsivity of a terahertz quantum well detector, at least comprising:

• a driving power supply, a single frequency laser source, an optic, a terahertz array detector, a terahertz dynamometer, a current amplifier and an oscilloscope, characterized in that,
• the single frequency laser source is connected with the driving power supply, for radiating terahertz laser by the driving signal of the driving power supply;
• the optic is placed at one side of the single frequency laser source, for converging the terahertz laser;
• the terahertz array detector is placed at one side of the optic, for measuring a cross-sectional shape of a convergent spot at a convergent focal point of the terahertz laser;
• the terahertz dynamometer is placed at one side of the optic, for measuring the total power of the convergent spot at the convergent focal point;
• the current amplifier is used for powering the terahertz quantum well detector, and extracting and amplifying a loop current as a voltage signal;
• the oscilloscope is respectively connected with the current amplifier and the driving power supply, for displaying and reading the voltage signal, a external trigger signal in the display process is a reference signal outputted by the driving power supply.