What is a LASER? Part 2: Collimated Light

Project Description

This is part TWO of a three part investigation of what makes LASER Light different from other light. Part 1 Monochromatic Light and Part 3 Coherent Light

In this part, we’ll demonstrate that LASER light is collimated by comparing the area of light produced by LED lights to that of LASER light at various distances.

Grades: 9 to 14
Duration: 1/2 Hour – 1 Hour

NGSS HS-PS4-5 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.

Supplies: Set of Light Blox , 1 Red LASER Pointer, 1 blank sheet of paper, a ruler

Download the FREE Lesson – Collimated Laser Light

Featured Products
Light Blox Kit

Light Blox Kit

Light Blox

Light Blox

Explore Optics OSA 100 Kit

Explore Optics OSA 100 Kit

Step 1

This activity will showcase one of the properties of LASER light that makes it so unique – Collimated. Start with the video.

Next, stick one a blank sheet of paper against the wall, in line with the table top.


Collimated Light Worksheet

Step 2

How much does the light spread as it travels?

Hold a  RED Light Blox 1” from the paper on the wall, and switch it on. Use a pen or pencil to trace the area of the circle (or rectangle) of light created. Repeat at 3” and 6”.



Step 3

Remove the paper from the wall and calculate the area of each of the circles. Record your data in the table.


Step 4

Repeat steps 4 and 5 with the red LASER pointer.

What do you notice about the size of the circle of light from the Lazr finger, and/or that of the rectangle from the Light BLOX at various distances from the wall? What could this mean, considering the nature of the light produced?

What do you notice about the size of the circle/ellipse of LASER light at various distances from the wall? What could this mean?

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