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4500PC12

# 4500PC12 - Czerny-Turner Monochromator 3 A monochromator...

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Unformatted text preview: Czerny-Turner Monochromator 3 A monochromator selects out a single wavelength from a broad spectrum of light. To accomplish this, the light must be dispersed into its component colors. The dis- persive element could be a prism or a grating. In a Czerny-Turner monochromator, a planar metallic reflection grating serves this role. A Czerny-Turner monochromator is shown in the figure below. In this type of monochromator, a planar grating with a period Λ is used to diffract a plane wave. The directions of the various wavelengths are given by the backward- diffracted-order grating equation, sin θ + sin θ i = i λ Λ n 1 . For the common situation of a monochromator in air, n 1 equals 1. Similarly, for first- order diffraction, i equals 1. By rotating the grating to an angle ρ , the freespace wave- length λ can be selected to pass through the system. The grating is rotated about an axis that is normal to the page of the figure. The rotation angle of the grating ( ρ ) is the angle between the normal to the grating (long dashed line) and the axis of the in-...
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4500PC12 - Czerny-Turner Monochromator 3 A monochromator...

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