Technical Notes

Technical Notes

Essentials of Laser Safety

Learn about laser classifications and the controls and protective equipment required to stay safe.

Technical Notes

Fundamentals of Laser Diode Control

To assess the quality, performance, and characteristics of laser diodes, manufacturers often perform exhaustive testing which requires electro-optical, spectral and spatial characterization …

Technical Notes

Laser Physics

A laser is a source of coherent light. It contains an optical oscillator that increases the amplitude of an optical field while maintaining its phase. This coherent amplification is …

Technical Notes

Light-Matter Interactions in Lasers

Light is generated from a laser as a result of the following process: electrons in a material move from an excited energy level to a lower-lying energy level and produce photons that …

Technical Notes

Characteristics of Laser Light

The most common laser light characteristics include: wavelength, gain bandwidth, monochromaticity, spatial and temporal profiles, collimation, output power, coherence and polarizat …

Technical Notes

Critical Laser Components

The critical components of a laser are a gain medium (acts as medium for population inversion), a pump source (serves as energy source for inverting population), and a resonator (provides …

Technical Notes

Types of Lasers

Lasers are typically identified by their gain medium and are often classified by the radiating species that give rise to stimulated emission.

Technical Notes

Methods for Pulsed-Laser Operation

It is often desirable to operate lasers in a pulsed mode since this can significantly increase the peak output power.

Technical Notes

Laser Spectral Tunability

The first way to perform laser wavelength tuning uses a wavelength-selective element to choose a specific portion under a gain bandwidth to lase. The second method of wavelength tuning …

Technical Notes

Laser Diode and LED Physics

Laser diodes possess several unique attributes compared to other types of lasers. They are very small compared to other classes of lasers, can operate very efficiently with relatively …

Technical Notes

Optical Emission in Semiconductor Materials

Electron-hole recombination processes give rise to spontaneous emission in an LED and stimulated emission in a laser diode.

Technical Notes

Laser Diode and LED Light Characteristics

Semiconductor lasers offer the benefits of efficiency, electrical pumping, and the ability to easily integrate with modern electronics which contribute to their ubiquitous usage.

Technical Notes

Laser Diode Production Burn-In

High temperature burn-in screening is used in laser diode manufacturing to screen out devices that are likely to have unacceptably short lives and to ensure that the remaining population …

Technical Notes

Laser Diode Life Testing

Life test studies are used to collect laser diode lifetime data under carefully controlled operating conditions. These data are then used to develop statistical models that can predict …

Technical Notes

Laser Diode Characterization

Laser diodes are characterized by their inherent physical properties within five distinct categories, including: electrical, spatial, spectral, optical, and dynamic properties.

Technical Notes

Solar Light Simulation

The surface temperature of the sun is approximately 5800 K; this means that the electromagnetic spectrum of radiation from the sun is similar to that of a 5800 K blackbody with the …

Technical Notes

Tunable Incoherent Light Sources

The TLS is versatile, being both a broadband and high-resolution monochromatic light source which makes it suitable for applications such as the study of wavelength-dependent chemical …

Technical Notes

Gaussian Beam Optics

The Gaussian has no obvious boundaries to give it a characteristic dimension like the diameter of the circular aperture, so the definition of the size of a Gaussian is somewhat arbitrary. …

Tutorials

Light Collection and Systems Throughput

This discussion is restricted to the general use of Incoherent Light Sources, such as arc lamp or quartz tungsten halogen sources. Diffraction and coherent effects are excluded. The …

Selection Guides

Laser Safety Glasses Selection Guide

The human eye can be permanently damaged from direct or reflected light from lasers and incoherent light sources. There is a wide variety of laser wavelengths and power levels that …

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