From the perspective of the entire VUV, UV and IR grade MgF2 optics, device and machine equipment, the developed countries such as the United States and Japan are major industrial countries, and they have a monopoly position in large-scale production of nonlinear optical crystals such as LiNbO3. Small-scale materials such as KTP, BBO, LBO, etc., mainly dominated by China and Lithuania. In terms of device manufacturing, due to the strong technical strength and good industrial base, developed countries such as the United States and Europe occupy a decisive dominant position. Developed countries such as China can only provide low-cost plano/spherical/aspherical/cylindrical MgF2 optics materials to developed countries and earn a small profit.
1) Development of ultraviolet light to shorter wavelength bands
The development of all-solid-state deep ultraviolet (200nm) coherent light source is one of the most advanced research projects in the field of optoelectronics in the world. This is because UV lasers have important applications in many high-tech fields, such as the new generation of integrated circuit lithography. All-solid-state UV-coherent light source; in photoelectron spectroscopy and spectroscopy, there is an urgent need for a tunable all-solid-state deep-UV coherent light source, which will play a key role in promoting the development of deep ultraviolet spectroscopy and spectrometers, and will open up A new field of material science research; deep ultraviolet coherent light sources will also greatly promote the development of laser precision machinery processing industry. Since there is no laser crystal directly outputting deep ultraviolet wavelength, the key problem of solving solid-state deep ultraviolet laser light source is concentrated on the development and application development of NLO frequency conversion crystal in the ultraviolet band, which is very attractive to the development of related industrial development and technological progress. Human.
2) Improvement of existing nonlinear optical crystal properties and development of new crystals
One of the most typical examples is the stoichiometric ratio of LiNbO3 (abbreviated as SLN). Due to the improved structural integrity, SLN has a superior flying over the performance of the conventional uniform lithium niobate (CLN). If the practical technology is solved, It will revolutionize the field of optoelectronics and optical communication. – BBO is a wholesale large size infrared Silicon optics that is first used to quadruple the 1064 nm laser output from Nd:YAG to obtain 266 nm ultraviolet light. It has been used for decades in this field of frequency conversion. However, when the output of the 266 nm laser exceeds 180 mW, the crystal is damaged by photorefractive damage. Recently developed mature CLBO crystals, not only crystal growth is easier than BBO, the single crystal grows larger than BBO, and it is not broken when the output of 266nm reaches 40 watts. In this area, CLBO has a tendency to replace BBO.