Blazed Holographic Grating
A blazed holographic grating is a diffraction grating where the sinusoidal profile has been transformed into a ‘saw tooth’ profile. This saw tooth profile effectively increases the efficiency of the blazed grating over the required wavelength region.
The blaze wavelength is the wavelength where the grating gives maximum efficiency. A blazed holographic diffraction grating can be manufactured using a number of techniques. The proprietary technique used by Spectrum Scientific creates a blazed grating which offers significantly lower stray light when compared to an ion-etched blazed grating.
A blazed holographic grating offers the same high efficiency as a blazed ruled grating, but significantly lower stray light and no ghosting.
Typical ‘saw tooth’ profile of blazed holographic grating