The scattering centre becomes a secondary source of radiation

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The scattering centre becomes a secondary source of radiation

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Presentation transcript:

The scattering centre becomes a secondary source of radiation

Now consider a set of equidistantly spaced correlated secondary sources

 ←

Zeroth Order

1st Order

1st Order

1st Order

1st Order

2nd Order

2nd Order

2nd Order

2nd Order

←   ←

←  λ λ = wavelength

←  d λ λ = wavelength d = spacing

←  d d λ λ = wavelength d = spacing sin  = λ/d

  2λ sin  = 2 λ/d

d 2λ sin  = nλ/d dsin  = nλ d = λ /sin  (for n = 1)

General relation sin  = nλ/d 3 2 1 General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

General relation sin  = nλ/d

Angled faceted surface of the grooves

Angled faceted surface of the grooves  Angled faceted surface of the grooves

Angled faceted surface of the grooves Blazed Gratings By blazing the grating grooves so that the angle between the incident beam and say the 1st order diffracted beam (mean for the various wavelengths) is the mirror reflection angle, most of intensity can be concentrated into the 1st order diffracted beam.  Angled faceted surface of the grooves

Angled faceted surface of the grooves Blazed Gratings By blazing the grating grooves so that the angle between the incident beam and say the 1st order diffracted beam (mean for the various wavelengths) is the mirror reflection angle, most of intensity can be concentrated into the 1st order diffracted beam.  Angled faceted surface of the grooves

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