What is dispersion mirror?

Definition: mirrors which provide some amount of chromatic dispersion for the reflected beam.

Can mirrors cause dispersion?

Figure 3: The variable layer thickness of chirped mirrors causes negative dispersion. Unfortunately, the sharp transitions between different layer thicknesses in this simple dielectric structure causes oscillations in group delay dispersion (GDD) as a function of wavelength (Figure 4).

What is double chirped mirror?

Double-chirped mirrors (DCMs) are often used for dispersion compensation in mode-locked lasers, particularly for those with pulse durations below ≈ 20 fs. They are typically designed not only to compensate a constant group delay dispersion, but also to correct higher-order dispersion.

What is a focusing mirror?

Focusing mirrors (concave mirrors) are characterized by one concave surface with a high reflection coating. The reflective coating allows focusing of a light beam. Most common coating materials include aluminum Al, gold Au or silver Ag.

What mirror is used in laser?

Spherically curved mirrors are commonly used in laser cavities and in laser beam expanders for high power lasers. A large range of concave and convex mirrors with radius of curvature from 5mm to 100 meters are available. Spherical mirrors can often be used in careful combination to give diffraction limited results.

What is the types of dispersion?

There are three types of dispersion: modal, chromatic, and material.

What is Vertex mirror?

The vertex is the geometric center of the mirror. Midway between the vertex and the center of curvature is a point known as the focal point; the focal point is denoted by the letter F in the diagram below. The distance from the vertex to the center of curvature is known as the radius of curvature (represented by R).

Why concave mirror is known as focusing mirror?

Concave mirror is called a converging mirror or focusing mirror because parallel rays of light fall on the mirror they converge at a point called focus.

How do dielectric mirrors work?

Dielectric mirrors function based on the interference of light reflected from the different layers of dielectric stack. This is the same principle used in multi-layer anti-reflection coatings, which are dielectric stacks which have been designed to minimize rather than maximize reflectivity.

What is delay dispersion?

Acronym: GDD. Definition: the frequency dependency of the group delay, or (quantitatively) the corresponding derivative with respect to angular frequency.

What are different types of dispersion?

What is dispersion compensation?

Dispersion compensation is the compensation of the fact that the speed of light in a given medium is depending on the wavelength. Especially laser pulses with short pulse durations in the ultrafast range.