平行光束投射器 parallel beam projector

平坦型光发射器 flat-geometry light emitter

平行反射光束 catoptric beam

反射平行光 dioptric light

平行光束辐射 parallel-beam radiation

多发射光学平台 Optical bench

平面衍射光栅 Plane diffraction grating

平面透射光栅 plane transmission grating

平稳发射光谱 smooth emission spectrum

平面衍射复制光栅 replica of plane diffraction grating