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Free-Electron Laser - Definition and Applications

A free-electron laser is a kind of laser that employs a beam of high-speed, relativistic electrons moving freely with an optical field via a magnetic structure.

15 May 2014

Harmonic Mode-Locking - Definition

Harmonic mode-locking is a method of achieving high pulse repetition rates in an actively mode-locked laser. This method is carried out in the laser resonator with a constant temporal spacing where multiple ultra-short pulses are circulated.

15 May 2014

Electroluminescence - Definition and Applications

Electroluminescence is the characteristic of a material to emit light when an electric current is passed through it, or when subjected to a strong electric field.

15 May 2014

Symmetry-Forbidden Transitions - Explanation and Principle

Symmetry forbidden transition is a term commonly used in the context of electronic spectroscopy. This term refers to the electronic transitions that occur from one quantum to another.

15 May 2014

Gouy Phase-Shift - Explanation and Principle

The Gouy phase shift is a popular axial phase shift that occurs in a converging light wave when it passes through its focus in propagating from -‡ to +‡ . The Gouy phase shift is an additional phase shift that occurs in the propagation of a Gaussian Beam.

15 May 2014

Gordon-Haus Jitter - Description and Principle

The Gordon-Haus jitter is a timing jitter that originates from the fluctuations in center frequency. This jitter has been greatly influencing long haul fiber soliton systems by causing a jitter in the output of fiber links.

15 May 2014

Füchtbauer–Ladenburg Equation

Füchtbauer–Ladenburg equation is used for calculating the stimulated emission cross-sections of the laser gain medium.

15 May 2014

Hermite-Gaussian Modes - Explanation and Equation

Propagation of light in a free space or a homogenous optical medium changes the intensity profile of light. In certain electric field amplitude distributions, the shape of the amplitude profile remains constant.

15 May 2014

Speckle Pattern - Introduction and Applications

Speckle pattern is a random granular pattern produced by the reflection of coherent light beam e.g. laser, at a rough surface such as a metallic surface, a display screen, white paint or a piece of paper.

15 May 2014

Moiré Pattern - Description and Applications

Moiré patterns occur when materials are overlapped with repetitive lines. It is a naturally occurring interference pattern created by overlaying similar but slightly offset templates.

15 May 2014