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Radiance - Deinition and Introduction

Radiance of a source is the power that is radiated from a surface within a solid angle and passing through a cross-sectional area. Radiance may be described as the power traversing at a point in a specified direction per unit area perpendicular to the direction of travel. Solid angle is the area projected on a unit sphere centered at that point. The symbol used for radiance is L having unit as Watt/ (m2sr1).

19 Jun 2014

Thermoelectric Cooling - Definition and Applications

Thermoelectric cooling is a process of eliminating heat energy from a device, component or medium with the application of constant voltage between two dissimilar semiconductors or electrical conductors.

19 Jun 2014

Superpulse Lasers - Definition and Applications

Superpulse is a specific waveform commonly used in CO2 laser systems either in a pulsed or continuous pattern. Superpulsed lasers are capable of emitting several thousand bursts of power per second.

19 Jun 2014

Radiant Intensity - Definition and Introduction

Radiant intensity may be defined as the amount of power emitted by a source in a particular direction per unit solid angle.

19 Jun 2014

Specular Reflection - Definition

There are two types of reflection: specular and diffuse. Specular reflection is a type of surface reflectance often described as a mirror-like reflection of light from the surface. In specular reflection, the incident light is reflected into a single outgoing direction. The name specular is derived from the Latin word speculum, meaning mirror.

19 Jun 2014

Optical Transmittance - Definition and Formula

Transmittance is the fraction of incident light of a specific wavelength which passes via a sample. It is also defined as the ratio of the incident power (P) to the resulting power (P0).

19 Jun 2014

Beam Combining - Definition and Applications

Beam combining is done through a number of processes in order to scale up the power and radiance of laser sources. There are a number of techniques that allow the build up of high power laser sources that result in high beam quality and high brightness.

19 Jun 2014