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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

Ulbricht Sphere - Definition and Applications

Ulbricht sphere, also known as an integrating sphere, is an optical device used for measuring the reflectivity/transmittivity of optical components and optical flux from an LED or bulb and a laser diode.

12 May 2014

Total Internal Reflection - Working Principle and Applications

Total internal reflection is the reflection of the incident light that hits a medium boundary at an angle greater than the critical angle relative to the normal to the surface.

12 May 2014

Pound-Drever Hall Technique for Laser Frequency Stabilization

The Pound-Drever Hall (PDH) method is a known and sophisticated method for frequency stabilization of lasers, for instance diode lasers, to a reference optical cavity, for instance Fabry-Perot cavity, in a ‘laser lock.’ In doing so, the laser linewidth is also considerably shortened.

From Qubig GmbH 12 May 2014