Reflection, grating

Figure 3.5 shows how white light falling at 90° to the surface of a reflection grating G is dispersed. The general equation for diffraction by a grating is... 

Figure 3.5 Various orders of diffraction tfom a plane reflection grating G R indicates the red end of the spectrum V indicates the violet end of the spectrum the central number is the order of diffraction...

Figure 1. Layout of a generic spectrograph employing a reflection grating. Angles a and (3 have the same sign if they are on the same side of the grating normal. Inset the condition for interference of light by a diffraction grating.

Figure 2. (a) Blaze condition for a reflection grating, (b) diffracted intensity for unblazed... 

An unusual feature of the geometry employed with reflection gratings is that the beam entering the camera may be squashed or expanded in the dispersion direction so that the beam size parallel to dispersion and along the slit respectively is... 

Fig. 4 shows the efficiency of the set of reflection gratings delivered with the Gemini Multiobject Spectrograph (GMOS) for Gemini-North (Section 2.3). 

Diffraction of light by transmission and reflection gratings was used to demonstrate the existence of light waves and led to the development of the diffraction equation. 

Fig. 5.9. A reflection grating illustrating the relative geometry of two light rays that may result in constructive or destructive reinforcement.

What wavelength will be observed at a detector that is placed at 23.5° when the light source strikes the reflection grating at an angle of 45.3° and the grating has 1250 lines per mm. Assume that the order of diffraction is first order. What is the second order wavelength observed ... 

Figure 2.23 Diffraction gratings. Each line in a grating acts as a separate source of radiation (a) but radiation transmitted at any angle 6 is retarded relative to radiation from the preceding line (b) by the distance x. In the transmitted radiation some wavelengths will undergo constructive interference while the majority will suffer destructive effects. Reflectance gratings (c) are frequently used and the principles of monochro-mation are the same as for transmission gratings.

A reflectance grating is the most suitable monochromation system for ultraviolet radiation... 

Figure 3.7 Diode array detector. Light from the lamp passes through the flow cell and to a holographic reflectance grating and the resulting spectrum is focused on the diode array. Detectors frequently have a spectral range of 190-800 nm and can offer bandwidths as low as 1.0 nm.

Figure 3. Optical system of instrument of spectral sensitivity measurement (L) Xe arc lamp (Ml) concave mirror (M2, M3) mirror (S) shutter (SI) slit (G) concave reflective grating...

Czerny-Turner spectrograph spect A spectrograph used chiefly in laboratory work, which has a plane reflection grating and spherical reflectors for the collimator and camera. cher-ne t3rn 3r spek-tra.graf)... 

Consider a reflection grating operating with an incident angle of 40° in Figure 20-6. 

Rowland was the first to rule reflection gratings on concave metal surfaces. Such gratings eliminate the necessity of the spectroscope collimator or focusing lenses, as they take light direct front the spectroscope slit and form the spectral-line images like a concave mirror. The echelon is another special type of grating. 

Very recently J.D. Mills et al. [19] have written a nano-structured Bragg reflection grating within the volume of silica glass using focused infrared laser light. Such photo-induced structures have potential for a variety of photonics applications, including information storage. 

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