The door opened almost at the first touch of the laser.

The position of the light sources and laser inside the machine are important.

In the 1960's, his research led to the development of several very powerful lasers.

This was the early days of lasers for commercial use.

We'll start by taking a step back and looking specifically at the part of the laser that we're talking about.

Also, I don't quite understand the significance of the laser.

That's right, the age of the biological laser is upon us.

But the anniversary of the laser got me thinking about this.

The use of lasers became common throughout Canada during these years.

In the next section, you'll learn about the different types of lasers.