研究目的
Investigating the design and fabrication of high-brightness tapered lasers with photonic crystal structures to achieve high output power while maintaining high beam quality.
研究成果
The study successfully demonstrates the fabrication of tapered lasers with a narrow taper angle, achieving high output power and nearly diffraction-limited beam quality. The maximum brightness is 85 MW·cm?2sr?1, with potential for further improvements in power output.
研究不足
The output power is limited by catastrophic optical mirror damage, and the beam quality degrades with increasing current due to thermal lensing effects. Future improvements could include facet passivation and enhanced cooling technologies.
1：Experimental Design and Method Selection:
The study involves designing and fabricating tapered lasers with photonic crystal structures, focusing on a narrow taper angle for the tapered section to improve beam quality.
2：Sample Selection and Data Sources:
The epitaxial layers are grown by metal organic chemical vapor deposition, and the devices are fabricated using lithography and etching techniques.
3：List of Experimental Equipment and Materials:
The fabrication process involves inductively coupled plasma etching, wet etching for current injection windows, and sputtering of Ti/Pt/Au on the p-side.
4：Experimental Procedures and Operational Workflow:
The devices are mounted p-side down on a copper heatsink, with specific reflectivities chosen for the front and rear facets.
5：Data Analysis Methods:
The beam quality is characterized using a commercial beam propagation analyzer, and the output power, voltage, and wall-plug efficiency are measured under continuous wave operation.
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