blazed grating


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Related to blazed grating: diffraction grating, transmission grating

blazed grating

A diffraction grating consisting of a series of nonsymmetrical grooves, thereby allowing a large proportion of the diffracted radiation to be concentrated into one order on one side of the zero order of the image.
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In this work, we first designed a large-area binary blazed grating coupler with a high coupling efficiency and a wide bandwidth.
The proposed binary blazed grating structure is shown in Figure 2.
As shown in Figure 4, [H.sub.1] is the height of the common blazed grating, [h.sub.i] (i = 1,2, 3,4) is the height of each discrete multilevel grating, H denotes the height of the binary subwavelength blazed grating, and [n.sup.TE.sub.eff(i)] is the effective refractive indices of the binary grating:
where [H.sub.1] is the height of the common blazed grating, H denotes the height of the binary subwavelength blazed grating, and [n.sub.2] and [n.sub.1] are the refractive index of Si and BCB, respectively.
Schematic of the proposed binary blazed grating coupler is shown in Figure 6.
Kinegrams (OVD Kinegram, Switzerland) typically feature the Diffractive Watermark[R], composed of gratings with an asymmetric sawtooth shaped cross section (blazed gratings).
"We are continuously learning from our customers and are pushing past traditional technical barriers in the manufacture of mechanically ruled blazed gratings."