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Transient behaviors of current-injection quantum-dot microdisk lasers.
1Department of Electrical Engineering, National Taiwan University, Taiwan. mhmao@cc.ee.ntu.edu.tw
Optics Express
|February 15, 2012
Summary
Quantum-dot microdisk lasers exhibit suppressed relaxation oscillations and fast turn-on for high-speed modulation. These lasers show potential for single-mode operation at room temperature.
Area of Science:
- Optoelectronics
- Semiconductor Lasers
- Quantum Dot Devices
Background:
- Microdisk lasers offer unique optical properties due to their small size and high Q-factor.
- Quantum dot (QD) active regions enable efficient light emission.
Purpose of the Study:
- Investigate transient behaviors of current-injection QD microdisk lasers at room temperature.
- Analyze factors influencing turn-on time and relaxation oscillations.
- Assess suitability for high-speed modulation and single-mode operation.
Main Methods:
- Experimental study of QD microdisk lasers under current injection.
- Rate-equation modeling to understand optical dynamics.
- Large-signal direct modulation experiments at 1 Gbps.
- Temperature-dependent modal analysis from 100 K to 300 K.
Main Results:
- Observed suppression of relaxation oscillations attributed to enhanced spontaneous emission factor.
- Achieved fast turn-on time (~1 ns) due to Purcell effect and increased nonradiative recombination.
- Demonstrated 1 Gbps direct modulation capability.
- Identified suppression of side mode lasing above 250 K.
Conclusions:
- QD microdisk lasers exhibit unique transient behaviors beneficial for high-speed applications.
- Enhanced spontaneous emission and reduced carrier lifetime contribute to fast turn-on and suppressed oscillations.
- Potential for stable single-mode operation under high-speed modulation at room temperature.
