| 摘要 |
<p>A grazing incidence interferometer 1 includes a light source 41, a light beam divider 42 configured to divide original light coming from the light source 41, an illuminator 43 configured to apply measurement light to a measurement subject W, a light beam combining module 44 configured to combine the measurement light reflected from the measurement subject W with reference light, and a photodetector 45 configure to detect a combined light beam. The grazing incidence interferometer 1 includes an interferometer main body 30, a stage 10 configured to hold the measurement subject W, a moving mechanism 20 capable of moving the interferometer main body 30 along the measurement subject W, and an auxiliary reflector 51 disposed on an extension of an axis of movement of the interferometer main body 30, an auxiliary light beam separator 52 configured to separate auxiliary light from the original light and to apply the auxiliary light to the auxiliary reflector 51, and an auxiliary photodetector 55 configured to detect the auxiliary light reflected by the auxiliary reflector 51.</p> |
