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Broadly tunable high-power InAs/GaAs quantum-dot external cavity diode lasers
Ksenia A Fedorova1, Maria Ana Cataluna, Igor Krestnikov
1Photonics & Nanoscience Group, School of Engineering, Physics and Mathematics, University of Dundee, Dundee, DD1 4HN, UK. k.a.fedorova@dundee.ac.uk
Optics Express
|October 14, 2010
Summary
This study demonstrates a broadly tunable, high-power external cavity quantum-dot diode laser. It achieves a record 202 nm tuning range, offering significant advancements for tunable laser technology.
Area of Science:
- Semiconductor Lasers
- Quantum Dot Technology
- Photonics
Background:
- External cavity diode lasers (ECDLs) are crucial for tunable light sources.
- Quantum dot (QD) lasers offer unique advantages like low threshold current and temperature insensitivity.
- Broadening the tuning range of ECDLs remains a key challenge.
Purpose of the Study:
- To demonstrate a record broadly tunable, high-power external cavity InAs/GaAs quantum-dot diode laser.
- To optimize output power and tunability through various design and operational strategies.
- To investigate the potential of quantum-dot technology for advanced tunable laser applications.
Main Methods:
- Fabrication of an external cavity laser incorporating InAs/GaAs quantum dots.
- Systematic investigation of different waveguide designs and laser configurations.
- Optimization of operational conditions, including pump current and temperature, to enhance performance.
Main Results:
- Demonstrated a record tuning range of 202 nm (1122 nm-1324 nm).
- Achieved a maximum output power of 480 mW.
- Obtained a side-mode suppression ratio greater than 45 dB in the central tuning range.
Conclusions:
- The developed external cavity quantum-dot diode laser offers unprecedented broad tunability and high power.
- The study highlights the effectiveness of optimized waveguide designs, configurations, and operating conditions for enhancing ECDL performance.
- This work paves the way for advanced tunable laser systems in various scientific and industrial applications.
