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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
Lasing characteristics of visible AlGaInP/AlGaAs vertical-cavity lasers
Optics Letters
|October 22, 2009
Summary
We report on visible vertical-cavity surface-emitting laser diodes. These gain-guided AlGaInP/AlGaAs devices demonstrate low threshold currents and stable linear polarization for efficient laser applications.
Area of Science:
- Optoelectronics
- Semiconductor Lasers
- Materials Science
Background:
- Vertical-cavity surface-emitting lasers (VCSELs) are crucial components in optical communication and sensing.
- AlGaInP/AlGaAs material systems offer potential for visible light emission, but challenges remain in achieving high performance.
- Gain-guided VCSELs present an alternative design for specific applications.
Purpose of the Study:
- To characterize the lasing performance of gain-guided AlGaInP/AlGaAs visible VCSELs.
- To investigate the operational parameters including threshold current and wavelength range.
- To analyze the polarization characteristics of the fabricated devices.
Main Methods:
- Fabrication of AlGaInP/AlGaAs gain-guided VCSEL diodes.
- Continuous-wave (CW) operation testing at room temperature.
- Measurement of threshold current, lasing wavelength, and polarization state.
Main Results:
- Achieved continuous-wave operation in the visible spectrum (657-685 nm).
- Demonstrated low threshold currents of 1.25 mA at room temperature (297 K) and 0.8 mA at 250 K for 10-microm diameter devices.
- Observed a stable, single linear polarization state independent of lasing mode and temperature.
Conclusions:
- Gain-guided AlGaInP/AlGaAs visible VCSELs exhibit promising lasing characteristics.
- The devices show potential for applications requiring low threshold current and stable polarization.
- Further development could lead to advanced visible light sources.
