Optical prism : a complete guide

Most of us remember the famous rock band Pink Floyd&#;s &#;Dark side of the moon&#; album  cover showing a light beam been diffracted in a &#;rainbow&#; through a triangular prism. That is a very good summary of how light beam travel through a prism, below you&#;ll find a complete guide to look further in optical prisms.

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What is a optical prism ?

Definition

An optical prism is a bloc of optical material cut in geometrical shape for the specific purpose of modifying the incident light beam by affecting it&#;s direction, rotational angle or diffraction.

In optical systems they are used to turn a signal or separate the signal according to it&#;s wavelengths.

Specifications

Many different optical materials can be used to manufacture a prism, depending of the type of prisms and the wavelength range they will be used in. Optical prisms can be provided with below materials  :

Below table shows the typical specifications / tolerances for optical prism manufacturing :

Specification Detail Dimensional range 0.3mm to 300mm Dimensional tolerances +/- 0.1mm (normal) or +/-0.05mm Surface flatness up to Lambda /10 Surface quality S&D 40/20 Angle tolerance up to +/- 1 arcmin

Prisms can be coated, AR to reduce signal reflection on the surface or Reflective coatings to enhance the signal reflection at specific wavelengths.

Different types of optical prisms

Type of prism Description Usage Image Right angle prism Prism with a right angle triangular cut shape with both sides opposite to the hypotenuse of equal dimension. They are used to deviate a light path to 90° or 180° by TIR (Total Internal Reflection) Penta prism Prism with a pentagone cut shape, with specific angles. Penta prisms are used to redirect a signal by 90° without inverting nor reversing the image. Retroreflector Round base prism with three face pyramidal sphape. Return the light at 180° even without alignment of the incident light and the retroreflector. Used in topograply and other applications. Dove prism Parallelepiped which correspond at a truncated right angle prism. Rotate the image with no deviation of the beam. The rotation angle is equal to twice the prism optical axis angle compare to the incident beam. Roof prism Roof shaped prism. Used to deviate the signal at 90° while inverting it. Equilateral prism Prism made of high diffractive Abbe number glass in a shape of an equilateral triangle. Used to disperse the light with different angles for each wavelength. (think of the Pink Floyd album cover). Pellin Broca prism Quadrilateral prism with angles of 90°, 75°, 135° and 60°. Deviate the light by 90°, used in spectroscopy and for harmonic separations. Wedge prism Prism made of a plan surface and and other tilt surface. Used to deviate light signal (mostly for laser beams) Micro prism Prism with dimensions between 0,3 and 3mm of side. Used in optical fiber sysems and endoscopy. Glued prism Assembly of custom prism made by gluing / cementing, can include air space in between parts. Custom made to fit customer applications.

Purchase this light refracting prism to create this cool Rainbow effect.

Create a rainbow effect in your photo using the light refraction technique below.

1. Turn one of the prism&#;s edges towards the camera.

2. Move and rotate until the rainbows appear.

TIP: If you take a picture through the prism, rainbows will appear along the borders of your image. Or you can simply angle the prism to cast a rainbow on your subject.

This optical glass lens can remove Unwanted Elements in your photo right out of the box.

Remove an unwanted element in your background using your new prism camera filter with the instructions below

1. Move the prism around your lens until the reflection, rainbow, or extra light hide the element.

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2. Not only will your subject be the focus of your picture but you will have added a creative effect.

Purchase now to use this crystal for photograph to make a Kaleidoscope picture

This is how to get a kaleidoscope effect with your new photography prism

1. Place the prism so one of its bases faces the lens.

2. Find something to shoot.

3. Cover as much of the lens as possible for best results.

This photography prism effect can even create Mirror, Ghost and Dreamy images

You can get this cool effect with your new crystal light prism by using the steps below.

1. Place the prism on the lens and move until you can see the reflections.

2. Place the prism on different areas of the lens or change the orientation and angle to experiment further.

This effect can create doubles of your models or a partial reflection that can resemble water, glass reflections or even ghosts.

You can even try to catch reflections of surrounding objects instead of your subject to create interesting blending effects. All without using a computer to create the effect.

TIP: Create a dreamy effect by simply placing the prism across the center of the lens instead of the side.

For more information, please visit Optical Prisms For Sale.