Application scenarios of transmission gratings

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Scientific Research: In astronomical observation, grating spectrometers are used to analyze stellar spectra to infer their chemical composition and physical state; in quantum optics experiments, gratings are used to prepare or detect photon orbital angular momentum states.

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Industrial Inspection: In semiconductor manufacturing, grating projection methods enable three-dimensional measurement of wafer surface morphology; in food inspection, near-infrared grating spectrometers can rapidly analyze the content of components such as moisture and protein.

Biomedical Applications: Flow cytometry uses grating spectrophotometry to simultaneously detect multicolor fluorescent labels in cells, enabling high-speed cell classification and counting; in ophthalmic diagnosis, gratings are used to measure corneal curvature or axial length.

Communication and Sensing: In fiber optic communication systems, gratings are used in wavelength division multiplexing (WDM) devices to achieve parallel transmission of multiple signals; fiber optic grating sensors can monitor physical quantities such as temperature and strain, offering advantages such as resistance to electromagnetic interference and long-distance transmission.