High-Power Semiconductor Laser Technologies
Summary
High-power semiconductor lasers have evolved into indispensable sources of coherent light, offering compactness, efficiency and direct electrical pumping. Modern designs span broad-area emitters, tapered ridge geometries and super large optical cavities, delivering continuous-wave output powers from several watts to tens of watts. Central challenges include the trade-off between output power and beam quality, thermal management at high current densities and minimisation of catastrophic optical damage. Advances in epitaxial growth techniques, asymmetric waveguide engineering and tailored mode-filtering structures have enabled watt-level single-mode operation with high brightness and wall-plug efficiencies exceeding 50 per cent. These developments underpin applications in materials processing, medical treatment, free-space communications and light-detection and ranging systems, where high optical power density and beam precision are critical.
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High-Power Semiconductor Laser Technologies publication trend
The graph below shows the total number of articles in high-power semiconductor laser technologies across all publications each year (not limited to Nature Index journals).
Technical terms
Brightness: Optical power emitted per unit area per unit solid angle, indicating beam concentration and suitability for long-distance propagation or precise material processing.
Beam quality factor (M2): Dimensionless metric comparing a real beam’s divergence to that of an ideal Gaussian; M2 = 1 denotes a perfect Gaussian beam, with higher values indicating increased divergence or multimode content.
Wall-plug efficiency: Ratio of emitted optical power to electrical input power, reflecting the overall energy conversion efficiency of the laser device.
Waveguide: Structured region within the laser chip that confines light laterally and vertically, shaping the modal profile and influencing threshold, slope efficiency and beam quality.
References
- Brightness improvement of edge-emitting lasers by combining vertical broad-area HiBBEE and laterally inhomogeneous waveguides. APL Photonics (2024).
- Simulation and analysis of high-brightness tapered ridge-waveguide lasers. Optical and Quantum Electronics (2023).
- High-power high-brightness 980 nm lasers with >50% wall-plug efficiency based on asymmetric super large optical cavity.. Optics Express (2018).
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