A low-cost single-wavelength semiconductor laser source using a laser pointer
Project Description

This project aims to develop a low-cost single-wavelength semiconductor laser source using a simple laser pointer.

A laser pointer typically emits multiple wavelengths within a spectral band, thus it is not a single-wavelength source. Having a truly single-wavelength narrowband optical source is oftentimes desirable for high-data-rate optical communications, including communications in datacenters and optical wireless communications, yet such a light source is typically expensive.

This project aims to develop such a light source by engineering a standard multiple-wavelength semiconductor laser chip from a laser pointer, and couple the laser light into an external micrometer-sized cavity. Such an external coupling provides an additional narrowband feedback to the laser to select a particular laser wavelength out of the multiple wavelengths.

The student will be using a commercially available glass bead as the external cavity. The resulting external-cavity-coupled laser system will give a compact, low-cost and feedback-stabilized single-wavelength laser source.

A single-wavelength semiconductor laser source engineered from a laser pointer, with an external optical feedback using a glass bead or an equivalent optical structure.

POON Andrew Wing On
Course type
Applicant's Roles

[The project is opened to all students from SENG and SSCI]

• Laboratory work with optics and photonics
• Study the literature on the frontier of optics and photonics
• Give monthly project presentations

Strong interest in participating in UG research and hands-on laboratory work in optics and photonics.

Applicant's Learning Objectives

• Learn the fundamental principles of optics and photonics relating to lasers

Complexity of the project