排序方式: 共有34条查询结果,搜索用时 15 毫秒
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基于新型光源的显示设备以大色域、高亮度、高解析度等优点成为了市场主流.蓝光作为三基色之一,是显示系统不可或缺的部分,它的波长、光谱宽度、亮度等参数影响着显示系统的方方面面.同时,过强的蓝光会损害人眼的视网膜细胞并影响生物节律.如何减少蓝光危害是设计显示系统时需要考虑的重要问题.以手机、电视屏幕为代表的显示设备是人机交互的重要媒介,为了减少其中的蓝光危害,在设备中通常都设有防蓝光模式.这种模式会影响到显示设备的色域.基于此,测量显示系统中色域和蓝光危害随着防蓝光模式的变化过程是有必要的.我们提出了一种测量显示设备特征点获得立体色域的理论.以目前市面上几种主流手机作为实验样本测量立体色域,结合光谱获得蓝光危害值,提出色域和蓝光危害的兑换比例这一测量标准,以评估防蓝光模式的质量. 相似文献
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Synchronously Pumped Mode-Locked 1.89 μm Tm-Doped Fiber Laser with High Detuning Toleration 下载免费PDF全文
We propose and demonstrate a synchronously pumped mode-locked Tm-doped fiber(TDF) laser without any extra mode-locking elements. Pumped by a 1.56 μm pulse fiber laser, the TDF laser generates 1.17 ps pulses with a spectral width of 9.7 nm and a repetition rate of 9.33 MHz. The emission wavelength is tunable along with the cavity length detuning in a wide range of 3 mm. The high detuning toleration is beneficial to achieve high temperature and vibration stability in all-fiber configuration lasers. 相似文献
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We propose a new method to separate different orders of an all-fiber passive Q-switching stimulated Brillouin scattering(SBS) laser. We use two fiber Bragg gratings connected by two circulators for the filtering. We obtain a stabilized pulse laser and measure the pulse width of different orders. The first order of SBS has a central wavelength of 1549.75 nm, an average output power of 9 mW, and a pulse width of 400 ns. The pulse width of SBS is reduced by the higher-order signals with the larger fluctuations. 相似文献
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Erbium-doped CW and Q-switched fiber ring laser with fiber grating Michelson interferometer 总被引:2,自引:0,他引:2
The band-pass characteristic of fiber grating Michelson interferometer is analyzed, which acts as bothband-pass filter and Q-switch. An erbium-doped fiber ring laser based on fiber grating Michelsoninterferometer is implemented for producing single longitudinal mode CW operation with 5 MHz spectrallinewidth and up to 6 mW output power. In Q-switched operation, stable fiber laser output pulses withrepetition rate of 800 Hz, pulse width of 0.6 μs, average power of 1.8 mW and peak power of 3.4 W aredemonstrated. The peak power and average power of the Q-switched pulses are varied with the repetitionrate. 相似文献
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A high-power pulsed pump method is proposed to obtain a high-energy output with an improved signal- to-noise ratio (SNR) during pulse amplification. Based on numerical analysis, the ytterbium-doped fiber amplifiers are compared under different pumping conditions. At the same signal gain, the output using the high-power pulsed pump shows great SNR improvement and reduced output signal distortion, compared with a continuous-wave pump and a low-power pulsed pump. By adjusting the pump parameters, the amplifier can achieve the optimal output SNR without sacrificing the signal gain. We believe that the high-power pulsed pump scheme is very suitable for the high-energy nanosecond pulse amplification, which has a high SNR requirement. 相似文献
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利用10.6 μm的CO2激光对不同直径的点状损伤和不同宽度的划痕进行了修复。经过波长351 nm的紫外激光考核发现,对于直径小于80 μm的点状损伤和对于宽度小于40 μm的划痕,随着损伤点尺寸和划痕宽度的增加,修复后阈值提高程度逐渐降低。划痕的宽度在达到40 μm以后修复效果非常微弱。修复过程中,由于作用时间较短及温度分布不均产生了热应力导致样片损伤以后产生径向裂痕,后续的紫外激光会使裂痕明显扩展。当样品被置于高温退火炉内退火3 h以后,应力导致开裂的现象得到了解决。 相似文献
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We present a fiat-top laser beam generation scheme using coherent beam combining of hexagonally arranged Gaussian lasers. To produce a beam with a flat-top profile, we optimize the amplitude and phase of each unit laser using the least-square method. Simulation results show that with 13 unit lasers, a beam with the flatness of less than 1% in the optimizing region can be achieved. The main lobe contains over 95% of the total power. The scheme requires no external beam shaping element and has the potential to be designed for high-power applications. 相似文献
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A simple scheme based on the uniform distribution for the placement of numerous laser beams in the context o~ fiber-based laser fusion is proposed. It is theoretically demonstrated that all modes of the geometrical factor can be eliminated if sufflcient laser beams are uniformly distributed on the sphere. In the case of a finite number of laser beams, a quasi-uniform distribution of beams can be achieved based on the equal area subdivision algorithm. Numerical simulations indicate that with the increasing number of laser beams, the order of the dominant geometrical mode increases, and the irradiation nonuniformity decreases accordingly. 相似文献