Method for simultaneously measuring reflectance, transmittance, scattering loss and absorption loss of high reflection/high transmission optical element

The invention relates to a method for simultaneously measuring the reflection, transmission, scattering and absorption of a high reflection / high transmission optical element. The method is based on the optical cavity ring-down technology, and includes the steps of firstly, measuring the ring-down time [tau]0 of an initial optical resonant cavity, then adding a high reflection / high transmission optical element to be measured, measuring the ring-down time [tau]1 of a test optical resonant cavity, and obtaining the reflectance / transmittance of the high reflection / high transmission optical element through calculation; simultaneously measuring ratios of a transmission / reflection light intensity signal and a scattering light intensity signal of the high reflection / high transmission optical element to a transmitted light intensity signal of an output cavity mirror, and obtaining the transmittance / reflectance and scattering loss of the optical element through calibration; and solving for the absorption loss of the optical element with the reflectance, transmittance and scattering loss. The measuring method can not only measure the reflectance, transmittance, scattering loss and absorption loss of the high reflection / high transmission optical element, but also enable high definition two-dimensional imaging of the distribution thereof.