User Manual

39
Lesson 5 Laser Emitter Module
Introduction
Laser is widely used in medical treatment, military, and other fields due to its good directivity
and energy concentration.
Components
- 1 * Raspberry Pi
- 1 * Breadboard
- 4 * Jumper wires (Male to Male, 2 red and 2 black)
- 1 * Network cable (or USB wireless network adapter)
- 1 * Laser Emitter module
- 1 * 2-Pin anti-reverse cable
Experimental Principle
A laser is a device that emits light through a process of optical amplification based on the
stimulated emission of electromagnetic radiation. Lasers differ from other sources of light
because they emit light coherently.
Spatial coherence allows a laser to be focused to a tight spot, enabling applications like
laser cutting and lithography, and a laser beam to stay narrow over long distances
(collimation), enabling applications like laser pointers. Lasers can also have high temporal
coherence which allows them to have a very narrow spectrum, i.e., they only emit light of a
single color. And its temporal coherence can be used to produce pulses of light—as short as
a femtosecond.
The schematic diagram: