凹面回折格子

concave grating

[目次：検出系]

球状またはパラボラ状の凹面鏡の表面に、多数の溝を平行に刻んだ反射格子の一種。分光だけでなく、集光や平行光線を作ることにも用いられる。

A kind of reflection grating that is designed in such a way that many grooves are cut in parallel on the surface of a spherical or parabolic concave mirror. The concave grating is used for not only spectroscopy but also for focusing a beam or producing a parallel beam.

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