Sensing based on novel laser technqiues

• Main Author: Malanum, Ivan Tennyson Narvasa
• Other Authors: Wang Qijie
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2024
• Subjects: Engineering
• Online Access: https://hdl.handle.net/10356/177090
• Institution: Nanyang Technological University

For the past decade, Quantum Cascade Lasers (QCLs) was introduced. It has grown to be more volatile and has been continuously developing and transitioning to become a practical mid-infrared region source for various application. Single-mode QCLs are high in demand due to its high-power and tunability. They are promising for high-resolution and highly sensitive trace gases sensing across the mid-infrared (MIR) region. Schemes such as Distributed Feedback (DFB) QCLs and External Cavity Feedback (EC) QCLs are used to improve the performance and stability of quantum cascade lasers in single mode operation. However, these schemes have complex fabrication and mechanical resonance that greatly affect the performance of the system. Thus, a cost-efficient and portable system is preferable while still providing a single-mode operation and a wide spectral range. In this project, we propose and demonstrate single-mode QCL array based on slot waveguide and the development of an integrated gas sensor using tunable single-mode QCL.