The development of quantum cascade lasers

• Main Author: Chew, Brandon Yu
• Other Authors: Wang Qijie
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2024
• Subjects: Engineering; Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/177183
• Institution: Nanyang Technological University

Quantum Cascade Lasers (QCLs) have emerged as a groundbreaking technology with diverse applications across various fields, ranging from spectroscopy and gas sensing to telecommunications and imaging. This paper presents an overview of the fundamental principles, design considerations, and recent advancements in QCL technology. Beginning with an introduction to the underlying quantum mechanics principles governing QCL operation, we delve into the unique structural design features that enable efficient photon emission and amplification. Key topics such as band structure engineering, intersubband transitions, and waveguide design are explored in detail to understand how they impact QCL performance. Finally, we outline future research directions and emerging trends aimed at pushing the boundaries of QCL performance and unlocking new applications in emerging fields such as quantum information processing and integrated photonics. Overall, this abstract provides a comprehensive overview of QCL technology, serving as a valuable resource for researchers, engineers, and practitioners seeking to harness the full potential of QCLs in their respective domains.