With the ever-increasing laser power and repetition rate,thermal control of laser media is becoming increasingly important.Except for widely used air cooling or a bonded heat sink,water cooling of a laser medium is mo...With the ever-increasing laser power and repetition rate,thermal control of laser media is becoming increasingly important.Except for widely used air cooling or a bonded heat sink,water cooling of a laser medium is more effective in removing waste heat.However,how to protect deliquescent laser media from water erosion is a challenging issue.Here,novel waterproof coatings were proposed to shield Nd:Glass from water erosion.After clarifying the dependence of the waterproof property of single layers on their microstructures and pore characteristics,nanocomposites that dope SiO_(2) in HfO_(2) were synthesized using an ion-assisted co-evaporation process to solve the issue of a lack of a highindex material that simultaneously has a dense amorphous microstructure and wide bandgap.Hf_(0.7)Si_(0.3)O_(2)/SiO_(2) multifunctional coatings were finally shown to possess an excellent waterproof property,high laser-induced damage threshold(LIDT)and good spectral performance,which can be used as the enabling components for thermal control in high-power laser cavities.展开更多
In this paper we describe the scanning electron microscopy techniques of electron backscatter diffraction, electron channeling contrast imaging, wavelength dispersive X-ray spectroscopy, and cathodoluminescence hypers...In this paper we describe the scanning electron microscopy techniques of electron backscatter diffraction, electron channeling contrast imaging, wavelength dispersive X-ray spectroscopy, and cathodoluminescence hyperspectral imaging. We present our recent results on the use of these non-destructive techniques to obtain information on the topography, crystal misorientation, defect distributions, composition, doping, and light emission from a range of UV-emitting nitride semiconductor structures. We aim to illustrate the developing capability of each of these techniques for understanding the properties of UV-emitting nitride semiconductors, and the benefits were appropriate, in combining the techniques.展开更多
基金supported by the National Natural Science Foundation of China(Nos.61522506,51475335,61621001 and 91536111)Joint Sino-German Research Project(No.GZ1275)+3 种基金National Program on Key Research Project(No.2016YFA0200900)Major projects of Science and Technology Commission of Shanghai(No.17JC1400800)“Shu Guang”project supported by Shanghai Municipal Education Commission and Shanghai Education(No.17SG22)Development Foundation National Key Scientific Instrument and Equipment Development Project(No.2014YQ090709).
文摘With the ever-increasing laser power and repetition rate,thermal control of laser media is becoming increasingly important.Except for widely used air cooling or a bonded heat sink,water cooling of a laser medium is more effective in removing waste heat.However,how to protect deliquescent laser media from water erosion is a challenging issue.Here,novel waterproof coatings were proposed to shield Nd:Glass from water erosion.After clarifying the dependence of the waterproof property of single layers on their microstructures and pore characteristics,nanocomposites that dope SiO_(2) in HfO_(2) were synthesized using an ion-assisted co-evaporation process to solve the issue of a lack of a highindex material that simultaneously has a dense amorphous microstructure and wide bandgap.Hf_(0.7)Si_(0.3)O_(2)/SiO_(2) multifunctional coatings were finally shown to possess an excellent waterproof property,high laser-induced damage threshold(LIDT)and good spectral performance,which can be used as the enabling components for thermal control in high-power laser cavities.
基金financial support of the Engineering and Physical Sciences Research Council, UK via Grant No. EP/J015792/1,“Nanoscale characterisation of nitride semiconductor thin films using EBSD, ECCI, CL and EBIC”Grant No. EP/M015181/ 1, “Manufacturing nano-engineered III-nitrides”+2 种基金Grant No. EP/P015719/1, “Quantitative non-destructive nanoscale characterisation of advanced materials”partially supported by the German “Federal Ministry of Education and Research” (BMBF) within the “Advanced UV for Life” consortiumthe “German Research Foundation” (DFG) within the “Collaborative Research Center 787”
文摘In this paper we describe the scanning electron microscopy techniques of electron backscatter diffraction, electron channeling contrast imaging, wavelength dispersive X-ray spectroscopy, and cathodoluminescence hyperspectral imaging. We present our recent results on the use of these non-destructive techniques to obtain information on the topography, crystal misorientation, defect distributions, composition, doping, and light emission from a range of UV-emitting nitride semiconductor structures. We aim to illustrate the developing capability of each of these techniques for understanding the properties of UV-emitting nitride semiconductors, and the benefits were appropriate, in combining the techniques.
