Dr Hay Wong MEng(Hons), MA (Cantab), PhD

=====Novel beam profiling prototype with laser self-mixing=====

#BACKGROUND#
- Laser is widely used in industry, biomedical and other kinds of fields. Beam size is one the most important parameters.

#TECHNICAL GAP#
- State-of-the-art profiling techniques employ either a scanning-based or camera-based system. Despite their profiling capabilities, these systems do not tend to be budget-friendly and easy to operate.

#HOW WE ADDRESS THE GAP#
- We propose to develop a novel cost-effective beam profiling prototype based on self-mixing interference to measure the Full Width Half Maximum (FWHM) of a laser beam. https://doi.org/10.1016/j.optlaseng.2023.107696



=====Laser offline measurement method based on self-mixing interference=====

#BACKGROUND#
- Real-time monitoring can investigate the relationship between the parameters and defects.

- In particular, the direct measurement of thin-wall component dimensions and surface defects can better realize the adjustment of process parameters to improve the mechanical properties.

#TECHNICAL GAP#
- Existing monitoring methods either indirectly predict part quality by checking equipment health situation or directly inspect the component with inflexible field-of-view.

#HOW WE ADDRESS THE GAP#
- We develop a novel monitoring proof-of-concept prototype based on the phenomenon of laser self-mixing to directly inspect for part quality.

- The system primarily uses a laser diode with a self-encapsulated photodiode which is capable of collecting optical feedback signal once the laser hits a target. https://doi.org/10.1016/j.jmapro.2023.07.041

=====Formation of Ti-6Al-4V composite powder via electrostatic adsorption=====

#BACKGROUND#
- The ability to form composite powder may lead to interesting opportunities in powder bed fusion processes.

#TECHNICAL GAP#
- Innovation in powder feedstock has not received a lot of attention.

#HOW WE ADDRESS THE GAP#
- We utilised the Design of Experiment approach to investigate into the effect of stirring duration and guest particle loading on the electrostatic adsorption process for the formation of micro–micro Ti-6Al-4V composite powder.https://doi.org/10.1007/s00170-023-12788-x