LECTURE DEMONSTRATION MANUAL | Instructional Research Lab : ucla physics | |
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0.1.2 Introducing the Laser The laser is used in many demonstrations, but the students are delighted with the device itself. First make a spot on the side wall and then catch it on your hand to show that the beam will not burn a hole through your hand. A short discussion of the dangers of looking down the beam is appropriate at this point. Then place the laser on the table so the beam hits the side wall, walk along to the middle of the beam, and clap erasers over it so the pencil-like beam is outlined in falling chalk dust. We also have fog-in-a-can available for outlining the laser beam. (This is very effective.) A similar stunning demonstration
for a small group to gather around is to ask for a volunteer with a diamond
ring. Beam the laser into the diamond, and clap chalk dust over it. The many
tiny beams emerging from the diamond are very beautiful. The beam pattern can be
used to "fingerprint" the diamond uniquely. A Metrologic publication "101 Ways to Use a Laser" is available. |