※ 引述《zhxl (武装肥宅)》之铭言：
: 刚刚听到小粉红细数中国领先于世界的科技
: 移动支付、高铁、核融合、量子计算、5G网络...
: 看了我有点想笑，这些科技都是欧美发明的
: 中国不过是顺应国情重点发展某项科技罢了
: 小粉红所吹的科技也没多领先其他国家
: 话说中国真的有领先于世的科技吗？
:
有啊，只是没多少人知道
就是雷射用的晶体KBBF
Nonlinear crystal only ‘made in China’
http://tinyurl.com/4dk792ef
A potentially very important nonlinear optical crystal, potassium beryllium
fluoroborate (KBBF), can be fabricated in only one laboratory in the world—
and that laboratory is in mainland China. As reported by David Cyranoski in
Nature magazine (Volume 457, pgs. 953–955, February 19, 2009)
The decades of work put into KBBF development within China have included
creating safety procedures and equipment for working with the poisonous,
cancer-causing element beryllium; the characteristics of beryllium are a
hurdle to setting up KBBF research laboratories in the U.S. and elsewhere.
For now, the rest of the world has to make do with the few KBBF crystals that
are outside China, and with other nonlinear crystals that have lesser
properties.
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https://www.nsf.gov/awardsearch/showAward?AWD_ID=0945282
This Small Business Innovative Research Phase I project is to develop a
commercial growth process for single crystals of KBe2BO3F2 (KBBF) using
hydrothermal techniques. KBBF shows exceptional promise as a deep UV
non-linear optical material (NLO). NLOs are vital for the development of
solid-state lasers with wavelengths below 200 nm for use in photolithography,
micromachining and spectroscopy. The sub-200 nm region is extremely
inaccessible and optics for those wavelengths are quite rare.
The successful development of commercial KBBF will enable laser applications
such as frequency doubling and wavelength mixing in the deep ultraviolet.
Currently, this material is unavailable in the open market. China has
invested heavily in developing this material but has embargoed its export.
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用途是什么？曝光机的雷射就需要这东西
你要说美国没研究吗？美国当然有研究
美国直到2016才终于突破，能自己生产
美国打破中国技术封锁生产出KBBF光学晶体
https://www.ptt.cc/bbs/IA/M.1455449548.A.B42.html
但大陆2015年研究出LSBO晶体，性能上较KBBF更好，看大陆那边资料LSBO还没量产
美国那边好像也没有类似的东西