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Self-pulsing and dual-mode lasing in a square microcavity semiconductor laser
Optics Letters
|September 29, 2023
Summary
Researchers observed self-pulsing and dual-mode lasing in a square microcavity semiconductor laser. This study details pulse generation and dual-mode operation, offering insights into laser dynamics.
Area of Science:
- Optics and Photonics
- Semiconductor Physics
Background:
- Microcavity semiconductor lasers are crucial for optoelectronic devices.
- Understanding lasing dynamics is key to controlling laser output.
Purpose of the Study:
- To experimentally investigate self-pulsing and dual-mode lasing phenomena in a square microcavity semiconductor laser.
- To characterize the generated pulses and dual-mode operation under varying injection currents.
Main Methods:
- Experimental study of a square microcavity semiconductor laser.
- Varying injection current to observe lasing states.
- Analysis of lasing spectra and relative intensity noise.
Main Results:
- Self-sustained pulses with 4.4 GHz repetition frequency and 30-40 ps width were achieved near the laser threshold.
- Continuous-wave operation observed at higher currents.
- Dual-mode lasing at 30.7 GHz and 10.7 GHz recorded at specific currents.
Conclusions:
- Two-mode interaction can induce undamped relaxation oscillations, leading to self-pulsing.
- Injection current controls the transition between pulsed and continuous-wave, and dual-mode lasing.
- Relative intensity noise analysis correlates lasing states with relaxation oscillation and mode beating dynamics.
