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Control brightness and light distribution within LED light boxes with 3M™ Envision™ Diffuser Film 3735. Our white vinyl film is 50 µm for controlling brightness and light distribution. It’s designed specifically for application on to LED light sources with transparent substrates such as glass or plastic on the rear side of the illuminated sign. Available as a version with 50% light transmission and a version with 60% light transmission.

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The modes of a laser resonator all experience optical amplification in the same gain medium, e.g. a laser crystal, in which they spatially overlap to a significant extent. This leads to the phenomenon of mode competition or gain competition. Unfortunately, the terms are not precisely defined, and different meanings appear to be used in the literature:

Ask RP Photonics for advice on details of laser operation, e.g. related to instabilities and noise phenomena, and their dependence on design aspects.

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3M™ Envision™ Diffuser Film 3735 is a cast, matte, white, 50 µm PVC-free vinyl film that controls brightness and light distribution in transparent LED light sources.

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In the case of the former meaning of the term, mode competition can in principle be quantified: it is complete if the intensity distributions of the modes are identical, so that self- and cross-saturation are equally strong (assuming that the emission cross-sections are also identical). Mode competition is then reduced if the overlap of the intensity distributions is incomplete. Two simple examples are:

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Various definitions of depth of field in the microscope are discussed. The variation in the integrated intensity in the image of a point object outside the ...

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Situations with reduced mode competition can be more complicated: a strong lasing mode can not saturate the gain for the others to a level which prevents them from lasing. One then has a situation with complicated nonlinear dynamics, often dominated by cross-saturation effects, but possibly also influenced even by tiny mode coupling effects. Depending on various details, a stable distribution of optical power over several modes may occur, or (more frequently) an unstable power distribution, which causes additional laser noise.

A frequently used (and very valuable) concept is to describe the light circulating in an optical resonator in terms of resonator modes. The light in each mode can then be characterized with few parameters, e.g. electric field amplitude (or total power) and optical phase, apart from optical frequency and polarization. When only a few modes participate e.g. in the lasing process, the overall number of parameters is small, and various physical phenomena can be described on that simple basis.

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Definition: the phenomenon that different resonator modes experience laser amplification in the same gain medium, leading to cross-saturation effects

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The discussion has shown that strong mode overlap can lead to a stable situation. Depending on the definition of terms, this may be considered as a situation with strong mode competition ( because of the strong overlap), or on the contrary as a situation with weak competition (as the situation is stable, not exhibiting explicit signs of competition).

In a situation with strong mode competition (in the sense of strong overlap of mode intensity distributions), which may occur, e.g., in a unidirectional ring laser, a single mode may be excited in the steady state (→ single-mode operation, single-frequency lasers): the mode with the highest net gain will saturate the gain so that it exactly balances its losses, and any other mode will then experience a negative net gain, which causes its power to fade away.