What is a blazed diffraction grating?
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.
What is the formula for diffraction grating?
The formula for diffraction grating: Obviously, d = \frac {1} { N }, where N is the grating constant, and it is the number of lines per unit length. Also, n is the order of grating, which is a positive integer, representing the repetition of the spectrum.
How are blazed gratings made?
Ruled, Blazed Diffraction Gratings The master gratings are produced by forming the surface of a soft metallic coating with a diamond form tool. The resulting groove profile has a well defined and controllable groove profile that directs energy efficiently into the desired wavelength range.
What is the blaze wavelength?
The blaze wavelength is the wavelength at which the grating is most efficient. This grating is most efficient at 300 nm, so the blaze wavelength is 300 nm. This is determined mostly by the shape of the grating. Optical coatings can also be added to affect efficiency.
How do I choose a grating?
When selecting gratings, you must choose a wavelength range with a width equal to the Spectral Range entry in the Spectrometer Grating Selection Chart. The grating’s highest efficiency is within the range listed in the Best Efficiency (>30%) column.
What is the blaze angle?
The direction in which maximum efficiency is achieved is called the blaze angle and is the third crucial characteristic of a blazed grating directly depending on blaze wavelength and diffraction order.
What is a blaze function?
This algorithm approximates the blaze function by a sinc square and finds the function parameters by a non-linear least squares fit to the order profile. The method is suitable for objects without strong emission or absorption features and can be used to get a first estimation of the blaze parameters.
How does an Echelle grating work?
Principle. As with other diffraction gratings, the echelle grating conceptually consists of a number of slits with widths close to the wavelength of the diffracted light. The intensity of the diffraction pattern can be altered by tilting the grating.
What is the two types of diffraction?
There are two main classes of diffraction, which are known as Fraunhofer diffraction and Fresnel diffraction.