INDUSTRY COMPONENT

Laser Diode

A semiconductor device that emits coherent light through stimulated emission, used as the light source in barcode scanners.

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Component Specifications

Definition
A laser diode is a semiconductor device that converts electrical energy into coherent light through the process of stimulated emission. In barcode scanners, it serves as the primary light source, emitting a focused beam that illuminates barcode patterns. The reflected light is captured by a photodetector and processed to decode the barcode information. Laser diodes offer advantages such as high efficiency, compact size, and precise wavelength control, making them essential for accurate and fast barcode reading in industrial and commercial applications.
Working Principle
Laser diodes operate on the principle of stimulated emission within a semiconductor p-n junction. When forward-biased, electrons and holes recombine in the active region, releasing photons. These photons stimulate further recombination, producing coherent light. The optical cavity formed by the cleaved facets of the semiconductor material amplifies the light, resulting in a narrow, collimated beam. In barcode scanners, this beam is directed onto the barcode, and the reflected light intensity variations are analyzed to decode the pattern.
Materials
Typically made from III-V semiconductor compounds such as Gallium Arsenide (GaAs), Aluminum Gallium Arsenide (AlGaAs), or Indium Gallium Arsenide Phosphide (InGaAsP). The substrate is usually GaAs, with epitaxial layers forming the p-n junction. Encapsulation includes a TO-can package with a glass window or lens for beam shaping.
Technical Parameters
  • Package TO-18, TO-46, or surface-mount
  • Lifetime >10,000 hours
  • Wavelength 630-670 nm (visible red) or 780-850 nm (infrared)
  • Output Power 1-5 mW (typical for barcode scanners)
  • Beam Divergence 10-30 degrees (parallel and perpendicular)
  • Operating Current 30-100 mA
  • Operating Voltage 1.8-3.0 V
Standards
ISO/IEC 15416, IEC 60825-1, DIN 5031-7

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Laser Diode.

laser diode barcode scanner component semiconductor laser optoelectronics industrial barcode reading laser specifications GaAs laser Laser Diode in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Particulate Matter Sensor

A sensor that detects and measures particulate matter concentrations in air

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Barcode Scanner

An optical device that reads and decodes barcode information for identification and tracking purposes.

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Laser scanner module

A precision optical-electronic component that uses laser technology to perform non-contact scanning and measurement of surfaces or objects.

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Engineering Analysis

Risks & Mitigation
  • Electrostatic discharge (ESD) damage
  • Thermal overheating leading to failure
  • Eye safety hazards from laser radiation
  • Output power degradation over time
FMEA Triads
Trigger: Excessive drive current or voltage spikes
Failure: Catastrophic failure of the semiconductor junction
Mitigation: Implement current-limiting circuits and ESD protection diodes
Trigger: Inadequate heat dissipation
Failure: Thermal runaway and reduced lifespan
Mitigation: Use heat sinks, thermal pads, and ensure proper airflow in the scanner housing
Trigger: Mechanical vibration or shock
Failure: Misalignment or damage to the optical cavity
Mitigation: Secure mounting with shock-absorbing materials and robust packaging

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Wavelength tolerance ±5 nm, output power tolerance ±10%
Test Method
Testing per IEC 60825-1 for laser safety, output power measured with calibrated photodiode, wavelength verified with spectrometer

Buyer Feedback

★★★★☆ 4.9 / 5.0 (11 reviews)

"The technical documentation for this Laser Diode is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Laser Diode so far."

"Testing the Laser Diode now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the typical wavelength of a laser diode in a barcode scanner?

Most barcode scanners use laser diodes emitting in the visible red spectrum (630-670 nm) for easy alignment and human visibility, though some models use infrared (780-850 nm) for specific applications.

How does a laser diode differ from an LED in barcode scanning?

Laser diodes produce coherent, collimated light with a narrow beam, allowing for longer reading distances and higher precision. LEDs emit incoherent, divergent light, suitable for shorter-range scanners like CCD-based models.

What are common failure modes of laser diodes in industrial use?

Common failures include gradual output power degradation due to aging, sudden failure from electrostatic discharge (ESD), and thermal damage from overheating, often mitigated with proper drive circuits and cooling.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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