Journal
LASER & PHOTONICS REVIEWS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202200703
Keywords
liquid lasers; microfluidics; optical gain; semiconductor nanocrystals; transient absorption
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With the development of optofluidic technology, liquid lasers have become a focus of research. The use of lead-halide perovskite nanocrystals as gain media has been demonstrated to have significant advantages over organic fluorescent dyes and traditional nanocrystals. A novel microfluidic laser device has been designed and realized, showing excellent performance and potential for practical applications.
With the development of optofluidic technology, liquid lasers have attracted intense interest but still face a formidable challenge due to the lack of qualified gain media and creative device design. Compared to the organic fluorescent dyes and traditional CdSe-based nanocrystals (NCs), the lead-halide perovskite (LHP) NCs feature larger gain coefficient and higher robustness, which renders LHP NCs a promising unexploited liquid gain medium. Herein, for the first time, the hidden principle governing the solution-based light amplification in LHP semiconductor NCs is demystified and it is demonstrated that the LHP NCs are superior solution-phase gain media showing a giant (approximate to 2600 cm(-1)) optical gain. On this basis, a novel microfluidic laser device is designed and realized that exhibits a record-low pump threshold (approximate to 22.7 mu J cm(-2)), high Q-factor (approximate to 7480), large output polarization (approximate to 0.91), and long-time robustness over high-intensity operation, which is readily applicable to practical applications. The findings represent a significant step toward the technologically important liquid lasers of the new generation and can advance optofluidic applications.
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