※ 引述《zhxl (武裝肥宅)》之銘言：
: 剛剛聽到小粉紅細數中國領先於世界的科技
: 移動支付、高鐵、核融合、量子計算、5G網路...
: 看了我有點想笑，這些科技都是歐美發明的
: 中國不過是順應國情重點發展某項科技罷了
: 小粉紅所吹的科技也沒多領先其他國家
: 話說中國真的有領先於世的科技嗎？
:
有啊，只是沒多少人知道
就是雷射用的晶體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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用途是什麼？曝光機的雷射就需要這東西
你要說美國沒研究嗎？美國當然有研究
美國直到2016才終於突破，能自己生產
美國打破中國技術封鎖生產出KBBF光學晶體
https://www.ptt.cc/bbs/IA/M.1455449548.A.B42.html
但大陸2015年研究出LSBO晶體，性能上較KBBF更好，看大陸那邊資料LSBO還沒量產
美國那邊好像也沒有類似的東西