This Day in Tech History

On This Day . . .

Light Amplification by Stimulated Emission of Radiation

prism1

May 16, First Laser Created

On this day in 1960, Theodore H. Maiman operated the first functioning laser, at Hughes Research Laboratories, Malibu, California. Maiman was not the first to apply for patents but he was the first to create an operating laser device.

Maiman with his first laser light

Maiman with his first laser light

Maiman used a solid-state flash lamp-pumped synthetic ruby crystal to produce red laser light, at 694 nanometers wavelength. The light produced by this device was not a true beam as we think of most lasers today, but rather a pulse.

First-laser-350

Maiman's disassembled laser

Maiman’s disassembled laser

 

A laser emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term “laser” originated as an acronym for Light Amplification by Stimulated Emission of Radiation. Lasers differ from other sources of light because they emit light coherently.

220px-Ted_Maiman_Holding_First_Laser

What does that mean? Well its spatial coherence simply means that a laser can be focused to a tight spot, and this enables applications like laser cutting and laser lithography. Its spatial coherence also keeps a laser beam collimated (to make parallel or bring into a line) over long distances, and this enables laser pointers to work. Lasers also have high temporal coherence which allows them to have a very narrow spectrum, i.e., they only emit a single color of light. Their temporal coherence also allows them to emit pulses of light that only last a femtosecond (one quadrillionth of a second). That’s fast!!!

Ruby-Laser-and-flash-tube

Lasers are used in many common consumer devices like DVD players, laser printers, and barcode scanners. They are used for laser surgery, various skin treatments, and in industry for cutting and welding materials. They are used in military and law enforcement devices for marking targets and measuring range and speed. You’ve seen lasers in lighting displays at entertainment venues. Lasers also have many important applications in scientific research.

Wonderful tribute from Ted’s wife Kathleen: How the First Laser was Made

Advertisements

Single Post Navigation

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: