Suppression of stray light in micro flat-field near-infrared spectrometer

A micro flat-field near-infrared spectrometer with simple structures and lower stray light was designed and developed. By comparing with the conventional method in which a additional installment was taken as a dispersion system to suppress the stray light, this method installed a plane mirror with a diameter of 8.5 mm in front of the collimation mirror to control the incident light. By adjusting the mirror, the angle of the incident light was changed and the light could be received by the collimation mirror totally without bypass light. Using this method, the stray light of the system has been reduced approximately by 1.13%. Furthermore, a linear array CCD detector was chosen as a receiving component to avoid the cooling system and scanning rotary mechanism of plane grating. By using the CCD detector and new stray light suppressing method, the flat-field near-infrared spectrometer has been microminiaturized.