Thermal ablation is quite a complex process in high energy continuous wave (CW) laser facility, and it is crucial to understand the damage mechanism for stable operation of laser system. In this paper, we observe the behavior of contaminants-induced damage via a self-build optics testing platform. The waveband of optical coatings (Ta2O5 and SiO2) under test is dedicated for the infrared. Based on 100kW level infrared CW laser, the thermal ablation process of the optical coatings and the substrate caused by typical surface contaminants (iron micro-particle) is recorded, which shows distinct results in many aspects. This work can be helpful for understanding the influence of contaminants and prevent the optical elements from thermal damage in high energy laser system.
A new class of semiconducting materials called organic-inorganic halide perovskites hereafter could lead to commercial photoelectric devices due to the ultrahigh-performance and low cost. Meanwhile, perovskite-based photodetectors also have a rapid evolution in recent years. On the part of optical sensors, visible light detection is crucial for many applications, including imaging, medical treatment, industrial auto-control and so on. However, it is difficult for traditional preparation techniques to reach large-scale preparation accompanied by splendid performance of the device. Herein, we reported a method for high performance photodetctor by brush-coating. The device structure of the photodetector is ITO/PEDOT:PSS/CH3NH3PbI2.4Br0.6/PC61BM/C60/LiF/Ag, and the composite perovskites are consisting of CH3NH3PbI3 and CH3NH3PbBr3 with optimized mixing ratio which is crucial for not only enhancing the photon absorption but also ensuring a adjustable detection range .The device shows an excellent detectivity of ~1011 Jones under the illumination of 650 nm light at the bias of -0.5V. Due to the brush-coating process, the dark current is effectively suppressed down to 10-10 A. The present results suggest a promising strategy for fabricating outstanding perovskite-based photodetectors and provide a potential strategy for large-area fabrication.
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