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FAFO version of Diffraction Limited's fiber-coupled laser diode module
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Rahix 0474c36dd9 Straighten values 
Set parameterization to a rounded focal distance so the dimensions of
the part are whole numbers where possible.

(Was 30.42mm, changed to 30.50mm)
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construction Straighten values 2026-07-16 18:10:17 +02:00
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README.md FAFO notice in README 2026-07-12 23:04:27 +02:00

README.md

Fiber Coupled Laser Module

This is a modified version of the project by Diffraction Limited (https://github.com/0x23/FiberCoupledLaserModule)

See FAFO Modifications below for details about our changes.

This project provides a compact, customizable fiber-coupled laser diode module platform suitable for the entire visible spectrum. Fiber-coupled light sources are widely used in scientific, industrial, and educational applications, but commercial solutions are often expensive, difficult to customize, or unavailable for specific combinations of laser diodes and optical fibers. In many cases, modules tailored to special wavelengths, uncommon fiber types, or unique experimental requirements simply cannot be sourced off the shelf.

The goal of this project is to provide an open, accessible alternative that can be built using readily available components and a simple machined brass part, while maintaining the precision required for efficient coupling into single-mode and other fibers. The design emphasizes flexibility, reproducibility, and ease of modification, making it suitable both as a practical light source and as a platform for exploring fiber-optic technologies.

⚠️ WARNING

Collimated or focussed lasers can cause serious eye injury. Do not replicate without proper training and appropiate laser safety precautions.


Example Image 3 Example Image 4 Example Image 4

Video

For detailed information on the design, construction process, and underlying principles, take a look at the project's YouTube video:

Watch the video on YouTube

Construction

The device was constructed in FreeCAD, feel free to take a look or reuse any components within the project.

Example 4 - Optical Cavity with Standing Waves

FAFO Modifications

  • We are using a different lens (Thorlabs CAY046). This lead to the need to change the mechanical dimensions quite a bit.
  • We are aiming to build the module using a 623nm red laser diode.