PLPC3-10MM

Optics - Light Pipes

Light pipes, also known as optical waveguides, are a type of optical component used to guide, diffuse, or homogenize light from a source. A light pipe is composed of an inner reflective, or total internal reflection, core surrounded by a lower refractive index cladding. Light generated by a source is coupled into the light pipe at one end, snaking its way to the opposite end of the light pipe before exiting. These components are ubiquitous across all optoelectronic devices from low end consumer electronics to specialized industrial and medical equipment. For many applications, light pipes are a necessity; this article focuses on the PLPC3-10MM light pipe and its application field and working principle.

PLPC3-10MM Application Field and Working Principle

The PLPC3-10MM light pipe from Thorlabs is a fiber optic light guide designed to redirect and evenly diffuse light from various sources. The device consists of a 10mm long, 1.6mm core with external cladding containing dimples which extract and homogenize light from any LED light source. The cladding is constructed from polycarbonate, reducing its index of refraction below that of the core. Light is coupled into the light pipe through either of the two end faces which have a 0.5mm radius modeled onto them.

When light is introduced into the light pipe, the light interacts with the cladding wall. A portion of the light is internally reflected at the core-cladding interface as the light constantly travels along the length of the light pipe towards the other end. As light propagates along the light pipe, the intensity falls off and dimples along the outer cladding collect the light and diffuse it outwards. This feature increases the efficiency of the light pipe significantly, allowing for more light to be delivered at the opposite end and ensuring uniform brightness along with increased longevity of the LEDs being employed.

The PLPC3-10MM is ideal for simple LED lighting applications where even-glow lighting is desired. Due to its efficient design, the device is a popular choice for applications such as solar panels, display panels, medical devices, and various other machining as well as illumination applications. The device is relatively low cost and can be customized to specific application needs.

In summary, the PLPC3-10MM light pipe from Thorlabs is an efficient and low cost solution for light redirecting and uniform diffusion applications. The device is made from polycarbonate with a 10mm long core embedded with 0.5mm radiuses. Light is coupled into the light pipe through either of the two end faces, propagating along the core and being diffused outwards by the cladding. The PLPC3-10MM is suitable for LED lighting, display panels, solar panels, and so much more.