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Properties of Laser Light: Coherent

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This is part three of a three part investigation of the properties of LASER light  from other light. Part 1: Monochromatic Light and Part 2: Collimated Light.

In this part, we’ll demonstrate that LASER light is coherent by comparing the interference pattern of a red LASER pointer to that of an LED light.

Grade Range:

1/2 Hour – 1 Hour


Set of Light BLOX in Red/Green/Blue, 1 Red LASER Pointer  OR Laser Blox a blank sheet of paper

NGSS Connections

PS4.B: Electromagnetic Radiation

Communicate technical information about how some technological devices use the principles of wave behavior and wave interactions with matter to transmit and capture information and energy. (HS-PS4-5)