![]() However, the significant difference is the specular reflection geometry is dependent on the blaze angle,, and NOT the grating surface normal. The blazed grating features geometries similar to the transmission and reflection gratings discussed thus far the incident angle ( ) and th order reflection angles ( ) are determined from the surface normal of the grating. It is also the angle between the surface normal and the facet normal. The blaze angle is the angle between the surface structure and the surface parallel. The other two, shown in Figure 3, are, the groove or facet spacing, and, the blaze angle. The blaze wavelength is one of the three main characteristics of the blazed grating. ![]() Due to this design, a blazed grating operates at a specific wavelength, known as the blaze wavelength. This means that the majority of the optical power will be in the designed diffraction order while minimizing power lost to other orders (particularly the zeroth). The blazed grating, also known as the echelette grating, is a specific form of reflective or transmission diffraction grating designed to produce the maximum grating efficiency in a specific diffraction order. More information about this can be found in the section below. Diffraction gratings of this type are commonly referred to as blazed (or ruled) gratings. This issue can be resolved by creating a repeating surface pattern, which produces a different surface reflection geometry. At this condition, no wavelength-dependent information can be obtained, and all the light is lost to surface reflection or transmission. 2 for this condition, =, we find the only solution to be =0, independent of wavelength or diffraction grating spacing. If the beams are on the same side of the grating normal, then both angles are considered positive.īoth the reflective and transmission gratings suffer from the fact that the zeroth order mode contains no diffraction pattern and appears as a surface reflection or transmission, respectively. Where is positive and is negative if the incident and diffracted beams are on opposite sides of the grating surface normal, as illustrated in the example in Figure 2.
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