Blaze angle

Figure 3.6 Use of a blazed grating at the blaze angle 4> N is the normal to the grating surface...

What is the useful wavelength range for a grating with 10,000 lines per mm and a blaze angle of 41.6° What spectral region is this ... 

Fluorescence Instrumentation and Measurements. Fluorescence spectra of the FS samples were obtained on a steady state spectrofluorometer of modular construction with a 1000 W xenon arc lamp and tandem quarter meter excitation monochromator and quarter meter analysis monochromator. The diffraction gratings In the excitation monochromators have blaze angles that allow maximum light transmission at a wavelength of 240 nm. Uncorrected spectra were taken under front-face Illumination with exciting light at 260 nm. Monomer fluorescence was measured at 280 nm and exclmer fluorescence was measured at 330 nm, where there Is no overlap of exclmer and monomer bands. 

Fig. 5 Diffraction grating. Ng = normal to the grating Nf = normal to the face of the grating A = angle of incidence 0 = angle of diffraction d = grating spacing and B = blaze angle.

Fig. 18. Spectral dispersion at a diffraction grating, a Grating constant, / Blaze angle, t/tp. angle of incident radiation, 2. angle of diffracted radiation with wavelength X.

While ruled gratings are separated into different families according to their blaze angle, interference gratings are categorized by using the modulation frequency, a, defined as ... 

Table 31 Dispersion and bandpass values of a commercial instrument using an echelle grating with 79 groovesmm, with a blaze angle of 6T 26, and having the parent line at the 42nd order. Effective aperture of the spectrometer is f/8. The width of the entrance slit is 80 ptm, and the width of the exit slit is 40 fJm. (Unicam Analytical Systems Ltd.)...

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