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Laser Cutting & Welding, Laser Surgery, Spectroscopy, Integrated Optical Systems, Fiber Communication Systems
The proposed TRW structure achieves single-transverse mode lasing and high output power simultaneously through equipping the multimode active main waveguide with a pair of lossy auxiliary waveguides. The real parts of the propagation indices of the guided modes, supported by the auxiliary waveguides, are engineered to match with those of the higher-order modes supported by the main waveguide. By appropriately selecting the coupling coefficient (which can be controlled by adjusting the separation distance between the main and auxiliary waveguide or the etching depth) according to the gain-loss contrast between the main and the auxiliary waveguides, the higher order modes associated with the main waveguide will couple with the dissipative modes provided by the auxiliary waveguides and split into symmetric and anti-symmetric supermode pairs. Owing to the strong loss added in the auxiliary waveguides, the modal losses and accordingly lasing thresholds of the higher-order modes are significantly increased.
• Capable of single-mode operation without the expense of increasing the threshold current.
• Easier to couple the laser beam out with higher alignment tolerance.
• Does not require modification of the epitaxial structure and is therefore compatible with current epitaxial technique, making it capable of low cost and mass production.
Lin Zhu, Xiaolei Zhao, Yeyu Zhu
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