The term “grating” or “diffraction grating” often brings to mind a surface relief grating, with ruled lines and a delicate surface. Working in transmission, however, can open up many new options for the optical designer. In this tech note, we consider one special type: volume phase holographic (VPH) gratings. With benefits ranging from superior optical performance and design flexibility to robustness and consistency, VPH gratings are ideal for applications like laser pulse compression, spectroscopy, optical coherence tomography and astronomy.
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