Janus乳液的研究进展

Janus乳液是一类特殊的乳状液,其内相是由两种或两种以上不混溶的液体构成的液滴.与普通乳液相比,该类乳液具有更多的增溶选择性和更强的分隔作用,在生物分子、药物分子或营养物质的运输和储备中都有更广阔的应用前景.作者针对多种内相组成的Janus乳液,介绍了其形成原理、制备方法、刺激响应性及应用研究进展,旨在为该类乳液的进一步系统研究及应用提供参考.     

Lateral characteristics improvements of DBR laser diode with tapered Bragg grating

Broad area semiconductor laser (BAL) has poor lateral beam quality due to lateral mode competition, which limits its application as a high-power optical source. In this work, the distributed Bragg reflector laser diode with tapered grating (TDBR-LD) is studied. By changing the lateral width, the tapered grating increases the loss of high-order lateral modes, thus improving the lateral characteristics of the laser diode. The measuring results show that the TDBR-LD can achieve a single-lobe output under 0.9 A. In contrast to the straight distributed Bragg reflector laser diode (SDBR-LD), the lateral far field divergence of TDBR-LD is measured to be 5.23° at 1 A, representing a 17% decline. The linewidth of TDBR-LD is 0.4 nm at 0.2 A, which is reduced by nearly 43% in comparison with that of SDBR-LD. Meanwhile, both of the devices have a maximum output power value of approximate 470 mW.