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High-power vertical external-cavity surface-emitting laser emitting switchable wavelengths.
Optics Express
|October 29, 2020
Summary
This study demonstrates optically pumped Vertical External Cavity Surface Emitting Lasers (VECSELs) that switch between two distinct lasing wavelengths (954 nm and 1003 nm) by adjusting pump power. Maximum output power exceeded 2.2 W for single wavelengths and 2 W for dual-wavelength emission.
Area of Science:
- Optics and Photonics
- Semiconductor Lasers
Background:
- Optically pumped VECSELs are crucial for various laser applications.
- Controlling VECSEL output wavelength is essential for tunable laser systems.
Purpose of the Study:
- To investigate VECSELs capable of switchable lasing wavelengths.
- To analyze the impact of pump power on VECSEL output characteristics.
Main Methods:
- Utilized a single VECSEL gain chip for wavelength switching experiments.
- Varied optical pumping power to induce changes in gain chip temperature and tune lasing modes.
- Measured output power at different wavelengths and pump powers.
Main Results:
- Achieved switchable lasing at approximately 954 nm and 1003 nm from the same gain chip.
- Observed thermal rollover in output power, with the first rollover indicating a wavelength switch.
- Maximum output power exceeded 2.2 W per wavelength at -5 °C.
- Demonstrated dual-wavelength emission near 954 nm and 1003 nm with nearly 2 W output power.
Conclusions:
- Demonstrated a VECSEL with pump-power-controlled switchable lasing wavelengths.
- The findings highlight the potential for tunable VECSELs by managing thermal effects within the gain chip.
