If a laser beam is sent through some optical setup, this will in general modify the magnitude and type of beam pointing fluctuations, even if the optical components are absolutely stable. The following two examples illustrate this:

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TOUGH WHITE DIFFUSION A general purpose group that offers medium to dense diffusion properties. Wide beam spread creates an even field of soft, shadowless light that is quite pleasing.

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A further reduction in pointing fluctuations may be achieved with an active stabilization scheme. It is possible e.g. to monitor the beam position at some point with a four-quadrant photodiode and correct it via piezo-actuated mirrors.

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Faces love these materials-especially when Tough White Diffusion is placed close to the lamp and when Grid Cloth is mounted far away. Don't believe me, ask the doll in the tests.

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This same basic principle applies to most of the lighting equipment used in film and video production. The reflectors in such fixtures gather the light into a point source and then focus it, usually through a lens. The resulting beam of light is directional, offering a high level of intensity or "punchy but it can also present a number of drawbacks:

The beam pointing stability of commercial laser products is often quantitatively specified. Unfortunately, such specifications are often not precise or even meaningless. A useful specification of angular fluctuations has to observe a number of important issues:

TOUGH SILK A unique diffuser with directional properties. Spreads the beam in one direction-horizontally, vertically or diagonally-to create a slash of light. Also useful for spreading out an unwanted beam scallop caused by tight spaces and extreme lighting angles. Good transmission.

The most important difference between atmospheric diffusion and Rosco's version is that the Rosco diffusion materials can be utilized to produce controllable and predictable results at any time.

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The direction of the output beam of a laser is subject to some beam pointing fluctuations, which can in some cases cause significant problems – e.g., when the beam must be coupled into a single-mode fiber, or when the beam must precisely hit a target at a large distance. For such reasons, a quantitative measure for the beam pointing stability (see below) can be of importance.

Large diffusion panels can turn multiple lighting fixtures into a single source of soft, low contrast illumination. As overheads, diffusion can be placed above sets to deliver a soft, overcast look or used outdoors to diffuse harsh sunlight. Sets can even be "tented or completely surrounded with diffusion to produce an extremely soft, shadowless quality that is particularly useful for product photography of specular objects like glassware, jewelry and automobiles.

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With a good laser design, the angular beam pointing fluctuations of a laser can be a tiny fraction of the beam divergence. This corresponds to phase changes across the beam profile which are much smaller than one radian.

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Ask RP Photonics for advice on the origin of beam pointing fluctuations and their reduction with suitable laser designs or with feedback stabilization. With the powerful RP Resonator software one can calculate how misalignments of mirrors cause beam pointing deviations.

TOUGH FROST A general purpose group that offers slight to medium diffusion properties. Moderate beam spread, yet still maintains a discernible beam center.

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For judging the angular beam stability of a laser, not only the magnitude of angular fluctuations, but also the beam radius has to be taken into account. It is instructive to compare the angular fluctuations with the diffraction-limited beam divergence, i.e., the beam divergence of a Gaussian beam with the given size. The larger the radius of such a beam is, the smaller is its divergence angle, and the more severe is the influence of pointing fluctuations with a given angular spread.

It is important to note that a certain tilt of a resonator mirror does not necessarily translate into a tilt of equal size of the output beam. Instead, it generally leads to some combination of a (larger or smaller) tilt with some shift (offset) of the beam. The type of that influence depends on the whole resonator design (as discussed in the article on alignment sensitivity). For a linear resonator, the alignment sensitivity can be very different in the two stability zones, and can even diverge near the edge of such a zone. The alignment of different resonator mirrors can also very much differ in terms of sensitivity. Such issues have important implications for the optimization of pointing stability (see below).

The following diffusion groups are designated "Tough". This indicates that the base material is a heat stable polyester that can be used with most high-temperature lighting fixtures.

I don't have data on this, but I would expect that substantial high-frequency beam pointing fluctuations could rise from power fluctuations between the modes. That would of course not happen for single-mode diodes.

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Soft diffusion materials are quiet when used outdoors in windy conditions. They can also be heat-welded to produce large panels for overhead tenting and large area diffusion. However, these materials are only moderately heat resistant and should not be used directly on high temperature lights.

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The magnitude of angular fluctuations alone is actually often not sufficient to calculate the effect of beam pointing fluctuations in an application; it can also be important how large parallel beam offsets occur, and how these are correlated with angular fluctuations.

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GRID CLOTH A group of reinforced woven materials that offer medium to very dense diffusion properties. Very wide beam spread creates a very soft shadowless quality. Ideal for tenting, overheads, and large area diffusion. Can be sewn or grommetted to fit butterfly and overhead frames.

Diffusion possibilities are endless. Their use should be based on your own likes and dislikes. Be bold. Experiment. Create. It is important to remember that diffusion is designed to enhance the quality of the light; it is not a cure-all for a badly placed light.

In multimode laser diodes, to what extent does the changing mix of modes contribute to high frequency pointing noise? Do single-mode laser diodes generally exhibit lower pointing noise than multimode laser diodes, or are other factors more important than the number of modes when considering laser diodes?

Tough White Diffusion and Grid Cloth are heavy diffusers. Both create near shadowless light when used in large frames away from light. Multiple light sources can be made to appear as one. For example, these diffusers can take five 1,000W lamps grouped together, and the expected multiple shadows will not appear.

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Rosco diffusion material acts in a similar fashion. When placed in the beam path of a lighting fixture, diffusion material modifies the harsh quality of the light by spreading or dispersing the beam. This softens the quality of the illumination by increasing the apparent beam size and thereby altering the beam's "shadow casting properties".

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Nov 11, 2024 — ✔️ Magnification: Magnified mirrors can help if it's hard for you to see up close, or if you want to be very precise with something, like ...

When light from a point source shines on a three dimensional object, shadows are created. Of course, these shadows are the areas where the light does not fall. In nature, the sun on a bright cloudless day is a good example of light from a single point source.

Optical Physics ... Optical Physics is defined as the branch of physics that focuses on the behavior of light rays, particularly in relation to mirrors, lenses, ...

Diffusion material can be placed at the source in a gel holder, clipped to barn doors or positioned in front of a fixture in a frame. Each position produces a slightly different effect.

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On an overcast day, water vapor in the cloud cover alters the harsh directional quality of sunlight by causing it to be spread out or dispersed. The resulting light seems to be coming from the entire sky, producing an illumination that is softly diffuse. Shadows are faint or undefined. Contrast is lowered.