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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.
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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. If your application requires integrating the grating into a sub-assembly or a setup, please contact us to learn more about our assembly capabilities. Thorlabs uses a clean room facility for assembly of gratings into mechanical setups. Solvents will likely damage the grating's surface. No attempt should be made to clean a grating other than blowing off dust with clean, dry air or nitrogen. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the grating surface. Gratings should only be handled when necessary and always held by the sides. Optical gratings can be easily damaged by moisture, fingerprints, aerosols, or the slightest contact with any abrasive material. Thorlabs' gratings can be mounted directly into the KM100C Right-Handed or KM100CL Left-Handed Kinematic Rectangular Optic Mount for precise and stable mounting and alignment.
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Please see the Gratings Guide tab to choose the right grating for your application. Please see the graph to the right for performance characteristics. Our NIR transmission gratings are offered in two different sizes, with a choice of two groove angles. The gratings are also relatively polarization insensitive. The grating dispersion characteristics, however, lend themselves to compact systems utilizing small detector arrays. As the diffraction angles increase with the finer spacings, the refractive properties of the substrate materials used limit the transmission at the higher wavelengths and performance drops off. In most cases, the efficiency of these gratings is comparable to that of reflection gratings such as Ruled Gratings or Holographic Gratings when used in the same wavelength range.īy necessity, transmission gratings require relatively coarse groove spacings to maintain high efficiency. These grooved transmission gratings were designed for optimum performance in the near infrared, offering different levels of dispersion. Transmission gratings provide low alignment sensitivity, which minimizes alignment errors. The incident light is dispersed on the opposite side of the grating at a fixed angle.
![echelle grating zemax file echelle grating zemax file](http://www.scientificlib.com/en/Physics/Optics/images/EchelleGrating.png)
Due to their basic simplicity, transmission gratings are beneficial for use in fixed grating applications, such as spectrographs. Thorlabs' Near Infrared Transmission Gratings are designed for the 500 nm to 1.8 μm range. Designed for Optimum Performance in the Near Infrared.