What Are the Advantages & Disadvantages of Diode Lasers?

••• FotoSpeedy/iStock/GettyImages

Unlike visible light in the natural environment, a “laser” -- or Light Amplification by Stimulated Emission of Radiation -- produces a uniform monochromatic beam that does not scatter. This difference allows lasers to focus light and energy on very small surfaces, even on far-away objects -- a unique characteristic that lends itself to various applications.

Types of Lasers

Aside from their various applications, lasers are classified according to how they emit light. This includes “continuous wave” and “pulsed” lasers. Their classification basis also stems from the medium or materials used as a source of light, whether gas, solid-state or diode lasers. A relatively recent development in laser technology, diode lasers use semiconductors -- usually microscopic Gallium-Arsenide chips -- as a medium.

Advantages of Diode Lasers

Compared to most laser types, diode lasers are less expensive and more compact, making them ideal for small electronic devices, such as CD and DVD players, CD-ROMs, DVD-ROMs and other optical data storage devices. Laser printers, laser fax machines and supermarket bar code readers all use diode lasers. Using helium-neon lasers increases the size of these devices by as much as five times. Diode lasers use much less power than most types of lasers. While gas and solid-state lasers require a power supply in kilo-volts, diode lasers typically run on small volt batteries.

Disadvantages of Diode Lasers

Diode laser beams are highly divergent, meaning “wedge-shaped,” instead of straight and parallel, and have shorter coherent distances, which makes for inferior quality in optics performance. They are not as well-suited as helium-neon lasers for high-quality holography. Moreover, semiconductors, in electronic devices, are prone to static electrical discharges, meaning diode lasers in these gadgets can be damaged by unstable and fluctuating power supply. Also prone to gradual aging, diode lasers, over time, use increasing amounts of power with diminishing efficiency. The lens required for beam correction adds to the diode laser’s fragility such that damage to the lens renders the laser non-functional.


Many types of lasers pose a significant safety risk due to the power they distribute. Diode lasers are considered one of the safest types of lasers. Requiring less power, diode lasers present very minimal danger of electric shock; however, there is still danger if diode lasers are shined into the eyes of a person or animal.

Related Articles

Characteristics of a Diode Detector
What Is a Ferrite Clamp?
Types of Microscopes Used in Biology
What Are the Different Types of Ballast?
LED Vs. CF Light Bulbs
How an EMI Filter Works
The Advantages and Disadvantages of Reflecting Telescopes
Types of Photocells
Uses of Photocells
How Do CO2 Lasers Work?
What Is a Varactor Diode?
Regular Lights Vs. Laser Lights
What Is the Difference Between Concave & Convex Mirrors?
Difference Between a Laser, a LED, & a SLD
How Do LED Lights Work?
How to Create a Laser Beam
How to Read Oscilloscopes
Advantages & Disadvantages of Convex Mirrors
History of the Audio Amplifier