USING CDs AND DVDs AS DIFFRACTION GRATINGS

Diffraction and Compact Discs PHYS 1301 Prof T E Coan version: 4 Aug ‘99 Introduction By now, you have some experience with the phenomenon of diffraction In today’s lab you will use diffraction to probe the structure of the bottom of a compact disc (CD) Although an understanding of how a compact disc works is certainly not

Diffraction and Compact Discs - SMU Physics

Diffraction and Compact Discs PHYS 1301 F98 Prof T E Coan Last edit: 8 Aug ‘98 Introduction You all have some experience with the phenomenon of diffraction, even if the word is new to you In today’s lab you will use diffraction to probe the structure of the bottom of a compact disc (CD) Although an understanding of how a compact disc

USING CDs AND DVDs AS DIFFRACTION GRATINGS

The grating element calculations from the diffraction pattern will agree very well with the spacing measured from analyzing the AFM images The spacing of tracks in a DVD is about half as that in a CD giving it twice as many tracks per mm This accounts for about a two fold gain in the capacity of a DVD relative to CD

CD, DVD, and Blu-Ray Disc Diffraction with a Laser Ray Box

compact disc (CD) can be used as a diffraction grat-ing, even though its track consists of a series of pits, not a continuous groove Previous authors described how to measure the track spacing on a CD using an incident laser beam normal to the surface 1 or one at an oblique angle 2 In both cases, the diffraction pattern was projected on a

Diffraction - ccmrcornelledu

Here are a few places where diffraction is important a) CDs and DVDs – The finely spaced dots on a CD diffract light of all colors What limits how small the dots on the CD or DVD can be? What would happen if the dots were smaller than a wavelength of light? Why are scientists trying to develop blue lasers for a new type of CD?

Experiments with Diffraction

the CD case so that each hair is illuminated in turn and have the students measure the width of the diffraction pattern from the center to the first minimum Who has the thickest hair in the class based on the measurements? Who has the thinnest? For high schoolers: students can measure the diffraction pattern with hairs set up the same as the in

Diffraction and the Wavelength of Light

diffraction from a compact disc to infer spacing of information stored on the CD The word “diffraction” refers to the spreading out of waves after passing through a small opening (Figure 1) Diffraction effects are important when the size of the opening is comparable to or less than the wavelength To measure wavelengths, we need a device that

Experiment 9: Interference and Diffraction

Part 2: Diffraction from a CD Finally, you will measure the width of tracks on a CD by reflecting laser light off of it and measuring the resulting diffraction pattern Part 3: Thickness of Human Hair Next you will discover the ability to measure the size of small objects using diffraction, by measuring the width of a human hair

Interference and Diffraction Physics 227 Lab

Interference and Diffraction Physics 227 Lab 7 CD and DVDs For this part of the experiment we will use the grooves on a cd for multiple slit interference As shown on the right the actual slits we are working with are the lines of indents For standard cases one side of the CD or DVD has a reflective material, but if we remove the reflective

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