VCSEL激光器是什么激光器，其英文缩写表示的是什么？
另外，这中类型的激光器有什么特点啊？
我对激光器不是太了解，请专家帮忙，谢谢！！！
Vertical Cavity Surface Emisson Laser(垂直腔面发射激光器）
光束质量好，表面发射，效率高，可实现面集成。
制作工艺和半导体一致，芯片生长工艺复杂主要依靠MOCVD，MBE生长制作，目前长春光机所大功率半导体激光组在大功率VCSEL方面国内做得最好！直追国际最高水平，在固体泵浦上有应用。
Vertical cavity surface-emitting lasers (VCSELs), by contrast, use more complicated-to-grow structures than edge-emitters, and incorporate multilayer high reflectivity mirrors, emitting perpendicular to the growth plane. They produce good quality symmetric beams and tend to be spectrally pure. Their geometry allows easy on-wafer testing and they are therefore inexpensive to manufacture, but their power outputs are generally very small, usually ~1 mW. They have dominated short-range optical interconnection applications but have insufficient powers for telecommunication, data storage and other mainstream applications. The NECSEL laser's emitting area is hundreds of times larger than conventional vertical cavity lasers, thereby allowing scaling to high power levels. Compared with conventional VCSELs, the NECSEL laser requires similar growth complexity and uniformity, has similar electrical and thermal characteristics yet produces higher output powers by virtue of its larger emitting aperture and superior mode control due to the external cavity.
The NECSEL laser has patented technology to minimize current crowding, resulting in a flat and uniform gain distribution which produces a high quality beam. The difference is especially marked at high powers. While the VCSEL is inherently incapable of producing high power in a single-lobed, highly symmetric, nearly-diffraction-limited beam, the NECSEL diode does so with ease, generating ~1 W multimode and ~500 mW single mode in continuous operation and several W in pulsed operation.
Another key advantage is in spectral purity: while both edge- and surface-emitting lasers generate broad and unstable spectra, the NECSEL laser can produce a single narrow spectral peak. In communication or pulsed-mode applications, the modulation-induced spectral shift, or chirp, is much lower in a NECSEL laser than in conventional VCSELs.
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