Experimental study on property for the system coupled with double monochromators

To obtain monochromatic light with high spectral efficiency and low level of stray-light, using TRIAX190 as short focal with Model207 as long focal length monochromator coupled in series connection, in absolute spectral responsivity measurement facility of filter radiometer. The stray light's level of this system can achieve 10-8, efficiency of spectral luminous reach 3%. Wavelength calibration for 207 monochromator which played a major role in characteristics of series connection double-monochromator. The experiments' results show that the uncertainty of the monochrometer wavelength is less than 0.02 nm and the repeatability of 0.01 nm.