短語詞組短語concave diffraction grating 凹衍射光柵holographic concave diffractive grating 全息凹面衍射光柵concave holographic grating 凹全像光柵concave -grating spectrograph 凹面光柵攝譜儀holographic concave diffraction grating 全息凹面衍射光柵concave holographic grating monochromator 全息凹面光柵單色儀concave reflection grating 凹面反射光柵 返回 concave grating