The soft-killing laser weapon plays an important role in photoelectric defense technology. It can be used for photoelectric detection,search,blinding of photoelectric sensor and other devices on fire control and guidance devices, therefore it draws more and more attentions by many scholars. High power fiber-optic laser has many virtues such as small volume, simple structure, nimble handling, high efficiency, qualified light beam, easy thermal management, leading to blinding. Consequently, it may be used as the key device of soft-killing laser weapon. The present study introduced the development of high power fiber–optic laser and its main features. Meanwhile the key technology of large mode area(LMA) optical fiber design , the beam combination technology, double-clad fiber technology and pumping optical coupling technology was stated. The present study is aimed to design high doping LMA fiber, ensure single mode output by increasing core diameter and decrease NA. By means of reducing the spontaneous emission particle absorbed by fiber core and Increasing the power density in the optical fiber, the threshold power of nonlinear effect can increase, and the power of single fiber will be improved. Meantime, high power will be obtained by the beam combination technology. Application prospect of high power fiber laser in photoelectric defense technology was also set forth. Lastly, the present study explored the advantages of high power fiber laser in photoelectric defense technology.
This study was aimed to demonstrate whether laser treatment on dentin is effective to improve the marginal and internal fit of CAD/CAM occlusal veneers, which is a conservative restoration for severe tooth defect from abrasion. Sixteen extracted molars were divided into 4 groups according to adopting laser treatment on dentin and milling materials (n=4): Lava Ultimate CAD/CAM Restorative with no laser treatment on dentin (group LU-C), Lava Ultimate CAD/CAM Restorative with laser treatment on dentin(group LU-L), IPS Empress CAD with no laser treatment on dentin(group IE-C) and IPS Empress CAD with laser treatment on dentin(group IE-L). After the restoration adhesion, all of specimens were scanned by micro-computed tomography(micro CT) to evaluate the marginal and internal fit of each specimen by artificial setting measuring points from both bucco-palatal and mesio-distal direction. For marginal fit, there was no statistical difference with or without laser treatment on dentin for either milling material. For internal fit, the situation was identical. Laser treatment on dentin would not affect the marginal or internal fit of CAD/CAM occlusal veneers, therefore, it may not be necessary for improving the fit of restorations.
Recently, low-level laser therapy (LLLT) has been reported to have a photobiomodulation effect on bio-tissues. Our aim
was to evaluate the effect of low level GaAlAs laser on bone regeneration around bone defect sites created surgically in
rabbit femur. Thirty rabbits were randomly divided into an experimental and a control groups. A GaAlAs semiconductor
diode laser was applied in the experimental group( λ = 808nm, P =75mW, (symbol) =0.4mm,t=5min,
ρE=28J/cm2)immediately after surgery once a day for 3 consecutive days with no irradiation in the control group.
Rabbits were sacrificed on the 7th, 14th, 21th days after surgery (DAS) and femur samples were prepared for bone
histomorphometry analysis. The results showed that the bone volume, the osteoid volume, osteoblast surface and the
mineral apposition rate in the laser group were higher statistically (P<0.05) than those indices in the control group at
different periods. These data revealed that LLLT can enhance bone regeneration. LLLT seems to have a clinical
application in promoting bone healing around implant in the future.
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